I got my latest 750ml water bottle from a trade show stand, for free. You be the judge on value... $30 divided by $0 = infinity. So it's infinitely more expensive.its only 30 bux
is it worth it though?
Nonbikerelated talking thread. (nsfw)
i'm guessing it's much more irritating too, just imagine flying down a high speed technical descent only to have you drink bottle start beeping or whatever it does. If the bottle could refill itself, then maybe i'd consider the $30.
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mikesbytes
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Collects the sweat off your body, cleans it and puts it back in the bottle. No wait, thats how the suit worked in Dune.i'm guessing it's much more irritating too, just imagine flying down a high speed technical descent only to have you drink bottle start beeping or whatever it does. If the bottle could refill itself, then maybe i'd consider the $30.
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mikesbytes
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Interesting handlebars
Typical of the early/mid 1980's era where aerodynamics was just starting to be taken seriously.
The bike you picture is Russian, but the East Germans and the US also did similar things, with Charlie Walsh and the AIS getting the Aussies into similar although more refined aero thingys a few years latter.
The bike you picture is Russian, but the East Germans and the US also did similar things, with Charlie Walsh and the AIS getting the Aussies into similar although more refined aero thingys a few years latter.
For a non bike related talking thread, there really is quite a lot of bike talk, you know. Anyway, here is my contribution:A nice wooden bike...
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mikesbytes
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Tim set the rule that everything off topic is also on topicFor a non bike related talking thread, there really is quite a lot of bike talk, you know. Anyway, here is my contribution:A nice wooden bike...
hey check this thread out, its about going into jail, heaps interesting.
Theres one main poster thats interesting the rest isnt that good, his names 10 p or some thing, his first post is on page 3
http://www.pistonheads.co.uk/gassing/to ... 42266&i=40
Theres one main poster thats interesting the rest isnt that good, his names 10 p or some thing, his first post is on page 3
http://www.pistonheads.co.uk/gassing/to ... 42266&i=40
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mikesbytes
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Some of you may be confused as to who to vote for, as we come from different sectors of the community and have different needs. The following guide should assist in your decision.
You are a Gen Y child!lol!!! man they look better with those hair styles! i like the first one the most!
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mikesbytes
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Which hair style is yours? I'm an alternative voter according to that guide.i dont know which generation i am :S
i was born in 82
Tim, you are the oldest of the Gen Y category (born 1982-2000).
If we are going on hair styles, I'm "Average Working", but my 6-month old daughter is a young CBD professional!
Doesn't matter who you vote for... you end up getting a politician!
If we are going on hair styles, I'm "Average Working", but my 6-month old daughter is a young CBD professional!
Doesn't matter who you vote for... you end up getting a politician!
For the Rudd type, it's hard to differentiate b/n average working and young CBD professional types. I give up, maybe 1/6 grey is in order.
Obviously not famous enough.hey i took blood from a famous tennis player today and didnt realise untill after it. i cant remember his name though, he was the coach of the davis cup squad. all i talked about to him was golf on tv.
Which blood bank do you work at? I don't think I have ever seen you at Clarence St.
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mikesbytes
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Didn't know you were a vampire Tim. Since it was from a famous tennis player, does this mean you are going to have some serious dummy spits from now on?
BTW, my new hair style means I am now an average working voter.
BTW, my new hair style means I am now an average working voter.
Did you have a hair cut? No longer a hippie? I have to see this.BTW, my new hair style means I am now an average working voter.
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mikesbytes
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It would seem that Lindsay going to win the best beard award most weekends from now on.
John Newcomb. I keep forgetting his name :S
the other nurses seemed pretty impressed by him, i put the needle in not realising he was famous.
Yeah ive worked taking blood there for nearly 5 years
i would have done at least a couple of those in clarence st, but splity up, i do mobiles too.
the other nurses seemed pretty impressed by him, i put the needle in not realising he was famous.
Yeah ive worked taking blood there for nearly 5 years
i would have done at least a couple of those in clarence st, but splity up, i do mobiles too.
Just as well, otherwise you'll be with a tremor and have that 14G in the Brachial a.John Newcomb. I keep forgetting his name :S
the other nurses seemed pretty impressed by him, i put the needle in not realising he was famous.
Yeah ive worked taking blood there for nearly 5 years
i would have done at least a couple of those in clarence st, but splity up, i do mobiles too.
See if I can find you one of these days. Have to say, it's a great work environment there in Clarence St.
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mikesbytes
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Gee I didn't know that happened if someone bumped a red light
What if you are a cat hating cyclist? 
This reminds me of the Maddox take on vegetarianism.
Domestic cats kill lots of wildlife each year, and if there were no more cats I really wouldn't complain.
Having said that I don't run red lights, although I have gone through a few "dark orange" ones...
Domestic cats kill lots of wildlife each year, and if there were no more cats I really wouldn't complain.
Having said that I don't run red lights, although I have gone through a few "dark orange" ones...
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mikesbytes
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I'm a non practicing vegetarian.This reminds me of the Maddox take on vegetarianism.
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mikesbytes
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Who's good at hill climbing ?
I am not buying that house. Mowing would be torture.
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mikesbytes
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It's a T junction onto a busy road at the bottom, although, off memory there's about 20mtrs of flat to wipe off 100kph.I'm good at descending!
Baldwin St, Dunedin. Right?
19°/35%
19°/35%
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mikesbytes
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How did you guess.Baldwin St, Dunedin. Right?
19°/35%
BTW Dunedin is 45deg south. How do I know? That's where they make 45south whiskey. Not that it affects the gradient.
If you lived in that house, you'd definitely be using a triple.
To make matters worse, this homeowner has to pay more for his picket fencing than someone who owns a house on flat land (to account for the slope).
I estimate that the slope in this picture is around 30º. This means that the owner would have to buy 1/cos(30º) metres of horizontal fence paling for every metre of fence paling that someone on flat land would have to pay. That's over 15% more fence paling. Ouch
I estimate that the slope in this picture is around 30º. This means that the owner would have to buy 1/cos(30º) metres of horizontal fence paling for every metre of fence paling that someone on flat land would have to pay. That's over 15% more fence paling. Ouch
I would take MTB gearing instead.If you lived in that house, you'd definitely be using a triple.
Why bother with a fence? Any trespasser would just roll on down to the next house.To make matters worse, this homeowner has to pay more for his picket fencing than someone who owns a house on flat land (to account for the slope).
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mikesbytes
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http://en.wikipedia.org/wiki/Baldwin_Street,_Dunedin
He didn't ride his bike up, but he left his helmet on. BTW, there is some run off at the bottom.
He didn't ride his bike up, but he left his helmet on. BTW, there is some run off at the bottom.
What would be your max speed freewheeling down such a slope?
Your max speed would depend on how much you weigh.
While this seems to go against what Galileo proved (that objects will accelerate at the same pace regardless of weight), it is right.
At the end of the day, you are up against wind resistance, so you would want to try and slip stream yourself as much as possible. So if you are game enough, sitting on the top tube, with you hands in the middle of the handle bars, and your chin just above them would probably do it.
I suspect that you could crack 100km/hr, I have hit 84 or so going down Roseville Bridge, and I hit high 70's on the East Descent into Audley, neither of which are as steep as this.
Personally, I think that it is down to guts more than anything else. I don't think that I would like to descend this. When I have descended Awaba Street in Balmoral (12.5% average gradient), I have put my tail over the back of the saddle in an attempt to keep the rear wheel on the ground. If you put too much weight forward on this, the slightest touch of the front brake would probably put you over the handle bars.
I think that if you really wanted to get down there fast, use a tandem, double the weight, same wind resistance, only slightly more rolling resistance. Just don't expect to stop at the bottom...
James
While this seems to go against what Galileo proved (that objects will accelerate at the same pace regardless of weight), it is right.
At the end of the day, you are up against wind resistance, so you would want to try and slip stream yourself as much as possible. So if you are game enough, sitting on the top tube, with you hands in the middle of the handle bars, and your chin just above them would probably do it.
I suspect that you could crack 100km/hr, I have hit 84 or so going down Roseville Bridge, and I hit high 70's on the East Descent into Audley, neither of which are as steep as this.
Personally, I think that it is down to guts more than anything else. I don't think that I would like to descend this. When I have descended Awaba Street in Balmoral (12.5% average gradient), I have put my tail over the back of the saddle in an attempt to keep the rear wheel on the ground. If you put too much weight forward on this, the slightest touch of the front brake would probably put you over the handle bars.
I think that if you really wanted to get down there fast, use a tandem, double the weight, same wind resistance, only slightly more rolling resistance. Just don't expect to stop at the bottom...
James
Kamikazis were never meant to stop at the end of a dive.
Yes, weight would be a major factor in the max speed reached.
Yes, weight would be a major factor in the max speed reached.
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mikesbytes
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Yes there are some limiting factors that you don't get on Roseville bridge, in particular how can you be sure that no ones going to drive out of their driveway. Also the surface isn't perfect.
At the top is another street that runs parallel, so you could probably start at around 25kph.
At the top is another street that runs parallel, so you could probably start at around 25kph.
To get technical, weight is not the major factor in determining speed down a hill.
It is the surface area to mass ratio which contributes most to the terminal velocity acquired.
I constructed the formula that will determine terminal velocity of a cyclist, which I'll call Vt:
Vt = [2(m*sinΦ*g - Crr*Nf) / p*Cd*A]^½
where
m = the mass of the rider plus bicycle
Φ = the angle of the slope in degrees
g = the acceleration due to gravity
Crr = the co-efficient of rolling resistance for your tyres
Nf = the weight of the rider plus bicycle (not the same as mass)
p = the density of the air
Cd = the co-efficient of drag for the rider plus bicycle
A = the front-on cross sectional area of the rider plus bicycle
If we make some assumptions from data readily available online:
Φ = 19º, so sinΦ = 0.3256
g = 9.8m/s² (at sea level)
Crr = 0.006 (ranges from 0.004 to 0.007)
p = 1.204kg/m³ (at 1 atmosphere & 20ºC)
Cd = 0.8 (Ranges from 1.1 to 0.7 depending on tuck)
the formula simplifies to
Vt = [(6.382*m - 0.012*Nf) / 0.96*A]^½
In my case, I am 85kg, and my bike weighs ~8kg. This makes my combined weight 93kg*9.8m/s² = 911.4N, and I estimate my frontal surface area to be 0.4m².
My terminal velocity is therefore 38.95m/s or 140.22km/h
That's fast! - but I'm probably under-estimating my surface area...
It is the surface area to mass ratio which contributes most to the terminal velocity acquired.
I constructed the formula that will determine terminal velocity of a cyclist, which I'll call Vt:
Vt = [2(m*sinΦ*g - Crr*Nf) / p*Cd*A]^½
where
m = the mass of the rider plus bicycle
Φ = the angle of the slope in degrees
g = the acceleration due to gravity
Crr = the co-efficient of rolling resistance for your tyres
Nf = the weight of the rider plus bicycle (not the same as mass)
p = the density of the air
Cd = the co-efficient of drag for the rider plus bicycle
A = the front-on cross sectional area of the rider plus bicycle
If we make some assumptions from data readily available online:
Φ = 19º, so sinΦ = 0.3256
g = 9.8m/s² (at sea level)
Crr = 0.006 (ranges from 0.004 to 0.007)
p = 1.204kg/m³ (at 1 atmosphere & 20ºC)
Cd = 0.8 (Ranges from 1.1 to 0.7 depending on tuck)
the formula simplifies to
Vt = [(6.382*m - 0.012*Nf) / 0.96*A]^½
In my case, I am 85kg, and my bike weighs ~8kg. This makes my combined weight 93kg*9.8m/s² = 911.4N, and I estimate my frontal surface area to be 0.4m².
My terminal velocity is therefore 38.95m/s or 140.22km/h
That's fast! - but I'm probably under-estimating my surface area...
You are right Chris, the underlying parameter is indeed frontal surface area.
As for 140.22km/h. How about we try it on Awada St in Mosman? I wonder if our bike computers can actually display 3 digits?
As for 140.22km/h. How about we try it on Awada St in Mosman? I wonder if our bike computers can actually display 3 digits?
The problem with Awaba Street in Balmoral, is that it has a full stop sign at the bottom.
It may look like a standard Stop Sign, but on the other side of the intersection is a barrier, if you don't stop, it provides the full stop...
I can hit 70km/hr on Awaba Street, but that is a pretty short peak, once you hit it you tend to start worrying about shedding speed.
James
It may look like a standard Stop Sign, but on the other side of the intersection is a barrier, if you don't stop, it provides the full stop...
I can hit 70km/hr on Awaba Street, but that is a pretty short peak, once you hit it you tend to start worrying about shedding speed.
James
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mcrkennedy
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Ah down hills, the only time I get to overtake everyone.
Build one of those bmx ramps, and place it at the bottom of Awaba street. You can sail over the barrier, and into Balmoral beach for a swim!
Personally, I think Roseville bridge is the best place, if you go early to avoid the scary crosswinds.
Hang on a sec... I don't have a speedo on my bike though...
Personally, I think Roseville bridge is the best place, if you go early to avoid the scary crosswinds.
Hang on a sec... I don't have a speedo on my bike though...
So you can't even reverse calculate your frontal area...Hang on a sec... I don't have a speedo on my bike though...
Even with a speedo, I suspect I would still not be able to calculte my frontal area. The equation I used is for calculating terminal velocity, which requires ALOT of road, at constant gradient. More road than the length of Awaba street or Roseville Bridge.
It is much easier to measure frontal area, by taking a picture, putting a grid over the picture, and counting the grid cells that contain you or your bike.
I just googled it, and found a good article. Feel free to convert the imperial units to SI units.
It is much easier to measure frontal area, by taking a picture, putting a grid over the picture, and counting the grid cells that contain you or your bike.
I just googled it, and found a good article. Feel free to convert the imperial units to SI units.
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mikesbytes
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Sometimes its best if you don't know the truthHang on a sec... I don't have a speedo on my bike though...
That second bike looked to be the same as George's. Very nice.
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mikesbytes
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A good suit can make a man
hospital workers suspended for stealling bodies
http://www.smh.com.au/news/unusual-tale ... 22340.html
http://www.smh.com.au/news/unusual-tale ... 22340.html
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mikesbytes
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Um yes, I mean no Tim. Recon by the time I'm gone there won't be any value in my body.
Here's and another one that's gone, but voted out.
Geoff and Adrian should appreciate it (and the mus'o's)
http://www.youtube.com/watch?v=T4RQaLBwN70
Here's and another one that's gone, but voted out.
Geoff and Adrian should appreciate it (and the mus'o's)
http://www.youtube.com/watch?v=T4RQaLBwN70
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mikesbytes
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The Beer only diet
Find that belly button for bonus points!The Beer only diet
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mikesbytes
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This thread has been a bit quite lately
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mikesbytes
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mikesbytes
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Excellent mono, make that a duo
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mikesbytes
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mikesbytes
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Mate, it must be all those laps at tempe
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mikesbytes
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So what's next on the skill list?
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mikesbytes
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What tricks can the full time wheelies do?
I guess Backflips are the ultimate
http://www.youtube.com/watch?v=o7f1Aa-Y1x0
http://www.youtube.com/watch?v=o7f1Aa-Y1x0
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mikesbytes
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OK Tim, your turn
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mikesbytes
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What about something with crutches ?
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mikesbytes
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Can you go backwards on the wheelie?
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mikesbytes
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mikesbytes
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Decided to post this one in the non bike related thread, cos I'm sure its unridable
Was there even a slowies bunch this morning? It was pouring moderately around the start time.man i skipped slowies today because it was a bit wet :S
im rally turning soft :S
I'd be interested to know, last time the weather was like this only 4 of us turned up. I went back to bed after checking the weather. Hope it clears up for tomorrow.Was there even a slowies bunch this morning? It was pouring moderately around the start time.
I piked on the West Head ride this morning. I went to the gym and did a spin class and got just as wet as if I had ridden.
As I have said before, I have done plenty or riding in the wet, usually during the week. On the weekends, if it is raining when I am due to leave, I usually don't ride, but if I am on a ride and it starts to rain, I will usually keep going.
James
As I have said before, I have done plenty or riding in the wet, usually during the week. On the weekends, if it is raining when I am due to leave, I usually don't ride, but if I am on a ride and it starts to rain, I will usually keep going.
James
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mikesbytes
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Which gym did you go to?I piked on the West Head ride this morning. I went to the gym and did a spin class and got just as wet as if I had ridden.
As I have said before, I have done plenty or riding in the wet, usually during the week. On the weekends, if it is raining when I am due to leave, I usually don't ride, but if I am on a ride and it starts to rain, I will usually keep going.
James
Newtown Gym on King Street. My membership is due to expire on Wednesday and I have no plans on renewing it.Which gym did you go to?
Spin Classes are good exercise, but I have difficulty relating to actual bike riding, plus they are Sh*t Boring!
Lesson learned, gym's aren't for me....
James
Constant resistance gym exercise bikes are good for fixed power interval training. Why not do that instead? I understand that spin classes target the aerobic capacity more than power development, is that correct?
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mikesbytes
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From what I've seen (so far), there is quite a variance from instructor to instructor as to what is conducted. James may of had a different experience.Constant resistance gym exercise bikes are good for fixed power interval training. Why not do that instead? I understand that spin classes target the aerobic capacity more than power development, is that correct?
So what do they (spin class instructors) say about their aims?From what I've seen (so far), there is quite a variance from instructor to instructor as to what is conducted. James may of had a different experience.
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mikesbytes
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The primary role of an instructor is to have every spin bike utilised by participants, ie a full class. This is why the gym employees them.So what do they (spin class instructors) say about their aims?
You mean bird watching, right?The primary role of an instructor is to have every spin bike utilised by participants, ie a full class. This is why the gym employees them.
The instructors don't give "aims" except that they want you to work hard. Obviously the level that you work is up to you, depending on how much you turn the resistance control.
The problem that I have, is that on a bike, as the road gets steeper, you start knocking back on gears, you can't do that on the spin class bikes. It took me a while to work out what was bugging me about them, and I realised it when I was riding up a hill. I was turning a pretty low cadence, so I knocked down a gear or two, increased my cadence, but didn't change my speed. According to everything that I have come across, this is the better way to climb, in a higher cadence. On the exercise bikes, you just keep crunching a higher and higher gear.
I did have a good work out today, I have had one every time I have gone, but I also know that it is my prerogative to do that. But I often find that my leg strength gives out before I feel that I have reached a high intensity. I have always felt that I can push myself harder on the actual bike. I had a bit of an argument with the instructor today, he thought that I wasn't running a hard enough intensity because I was turning the pedals too fast, I was blowing a gasket trying to keep that gear running, but he doesn't see that. Plus I prefer to turn a faster cadence.
And Weiyun, you are right, the male to female ratio does mean that ornithology is a good sideline in those classes.
James
The problem that I have, is that on a bike, as the road gets steeper, you start knocking back on gears, you can't do that on the spin class bikes. It took me a while to work out what was bugging me about them, and I realised it when I was riding up a hill. I was turning a pretty low cadence, so I knocked down a gear or two, increased my cadence, but didn't change my speed. According to everything that I have come across, this is the better way to climb, in a higher cadence. On the exercise bikes, you just keep crunching a higher and higher gear.
I did have a good work out today, I have had one every time I have gone, but I also know that it is my prerogative to do that. But I often find that my leg strength gives out before I feel that I have reached a high intensity. I have always felt that I can push myself harder on the actual bike. I had a bit of an argument with the instructor today, he thought that I wasn't running a hard enough intensity because I was turning the pedals too fast, I was blowing a gasket trying to keep that gear running, but he doesn't see that. Plus I prefer to turn a faster cadence.
And Weiyun, you are right, the male to female ratio does mean that ornithology is a good sideline in those classes.
James
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mikesbytes
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James, do the spin bikes at Newtown have gears? The ones at FF use friction, which you twist on.
You wouldn't like RPM, you set your cadence to match the instructor, which is match to the music, which is set by Les Mills, so the only variance to other participants is how much friction you apply.
What was the instructors name?
male to female ratio is even better in pump classes
You wouldn't like RPM, you set your cadence to match the instructor, which is match to the music, which is set by Les Mills, so the only variance to other participants is how much friction you apply.
What was the instructors name?
male to female ratio is even better in pump classes
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