Building TT bike - help!

Bicycle related chatter & discussion
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G
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Postby G » 20 Feb 2010, 22:15

Brakepads

The brakepads are restricted steering due to frame's nose shape touching the brake (marked as red). Has anyone seen frames like this? How am I supposed to install front brakepad. Thinking of insterting a nut to bring the brakepad forward so that it doesnt touch the frame nose. Any other ideas/experiences?
Image



Also, there is no place to mount the rear brake at the usual position. Don't know how to mount it. There is some socket at the bottom of the frame. Any clues wot's their purpose?

Image

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G
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Postby G » 22 Feb 2010, 09:19

If brakes can be mounted on this frame, I have hopes that it can be mounted on mine too.

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G
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Postby G » 22 Feb 2010, 09:28

Cervelo P4 has hidden rear brakes?!

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weiyun
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Postby weiyun » 22 Feb 2010, 09:40

This photo may help you.

http://www.cyclingnews.com/features/pho ... -way/77987

But why don't you take it to Burwood Cycleworld or other LBSs that know modern TT bikes? Ask them for advice and buy any accessory parts you may need. For the money and time you've put in so far, you don't want to get the installation wrong. Certainly not for a component such as the brake

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mikesbytes
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Postby mikesbytes » 22 Feb 2010, 09:41

I've seen the brake mounted under the bottom bracket, so I'm assuming that bracket on yours does the same

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G
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Postby G » 22 Feb 2010, 09:49

This photo may help you.

http://www.cyclingnews.com/features/pho ... -way/77987

But why don't you take it to Burwood Cycleworld or other LBSs that know modern TT bikes? Ask them for advice and buy any accessory parts you may need. For the money and time you've put in so far, you don't want to get the installation wrong. Certainly not for a component such as the brake
Why this brake has cable arm to the right?! :shock: :shock: :shock: :shock: :shock:

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weiyun
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Postby weiyun » 22 Feb 2010, 10:10

Why this brake has cable arm to the right?! :shock: :shock: :shock: :shock: :shock:
Clearly many of these setups are specialised/custom designs, without accepted common standards. More reason why you should contact the frame/component manufacturer to know the exact spec of their product, and good LBS for practical advice and assistance. Guessing and getting it wrong can be detrimental to your health and race performance. :wink:

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G
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Postby G » 22 Feb 2010, 11:02

Clearly many of these setups are specialised/custom designs, without accepted common standards. More reason why you should contact the frame/component manufacturer to know the exact spec of their product, and good LBS for practical advice and assistance. Guessing and getting it wrong can be detrimental to your health and race performance. :wink:
O ye ye, I have contacted the frame manufacturer, and waiting for their reply. But from your inputs, I know that it is not a manufacturing defect, and can be dealt with.

Any ideas about the front brake? The frame has an aero nose shape, which touches the brake's cable arm. The only idea I can think of is put a spacer nut and move the brake forward so that it is further from the nose.

othy
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Postby othy » 22 Feb 2010, 11:13

You may need some specialized brakes such as the following -

http://www.bikeradar.com/gear/category/ ... rakes-8983

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weiyun
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Postby weiyun » 22 Feb 2010, 11:13

Any ideas about the front brake? The frame has an aero nose shape, which touches the brake's cable arm. The only idea I can think of is put a spacer nut and move the brake forward so that it is further from the nose.
Putting spacers b/n the brake caliper and fork will just alter the mechanical characteristics of the setup. It may work, but certainly not what the engineers had in mind. Do it at your own risk. If I was in your position, I'd go back a step and find a compatible front brake caliper. Dodgy front brake setup is even more worrisome than a dodgy rear brake.

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G
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Postby G » 22 Feb 2010, 13:47

This is the frame spec:

Image

I think these brakes will fit iniit
http://www.wiggle.co.uk/p/cycle/7/Tektr ... 360040373/

christian
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Postby christian » 22 Feb 2010, 13:57

It looks like those brakes will work. The Merida timewarp uses that brake on the front and a T725 on the rear under the BB. The front is designed to be mounted on the front or behind the fork but in this case you will have it on the front. CRC has both front and rear in stock. What you may want to watch is where the noodle comes out of the rear brake and if it is going to foul on your crank or chain ring.

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Postby G » 22 Feb 2010, 14:26

From the images, it looks like the noodle will come to the left, and that's the chain ring side :( Why would they design the noodle on the left?! :?

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Postby weiyun » 22 Feb 2010, 14:37

There's no telling which side it'll go in the tech drawing. Further, chainring is usually on the right side. :roll:

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Postby G » 22 Feb 2010, 14:41

There's no telling which side it'll go in the tech drawing. Further, chainring is usually on the right side. :roll:
I meant, looking at the brake when installing at the bottom of the frame (bike upside down), if the noodle is on the left, then it will be on the chainring side.

Are these brakes commonly available in Australian bike stores? I don't want to import them from wiggle or CRC unless I am sure about them.

Also, is there any other brake design like TRP 925 model that I may consider?

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Postby christian » 22 Feb 2010, 14:57

Where does the rear brake cable come out of the frame? Is it internal? Its hard to recommend a brake without knowing where the cable has to run, perhaps you could post a picture of the cable location.

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Postby G » 22 Feb 2010, 20:33

The rear brake cable comes out in the middle of the front tube. It is visible in the photo at the far right. I have put the rival brake for size comparison. It fouls the chainring.

Image

christian
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Postby christian » 22 Feb 2010, 20:55

Ok, you want a brake with the cable exit on the right hand side looking from the front. Most brakes have it on the left hand side except brakes designed to be mounted behind the forks like the TRP T925. So I would be wondering if it is possible to use a front brake caliper on the rear. The main difference is the length of the bolt and tyhe reach. How does he brake bolt onto that frame? Do you just screw the nut on the other side like a conventional frame? I have seen pictures of center pull TT brakes but I don't think they are very common. You may need to measure the required brake reach to determine if you can use a front brake.

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Postby christian » 22 Feb 2010, 21:03

The Oval A700 rear brake is able to be mounted under the chain stays on some frames, but it has the cable exit on the left. I'm thinking it just could be a narrower brake, you'd need to find one locally to see if it fits. Its a similar shape to the T925 rear.

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Postby G » 22 Feb 2010, 23:05

The Oval A700 rear brake is able to be mounted under the chain stays on some frames, but it has the cable exit on the left. I'm thinking it just could be a narrower brake, you'd need to find one locally to see if it fits. Its a similar shape to the T925 rear.
Thanks Christian
I will give a bell to Cycle world cyclery and ask if they have either Oval or TRP. Is there any other sydney shop where I am more likely to find such brakes?

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weiyun
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Postby weiyun » 22 Feb 2010, 23:17

Cheeky Monkey Sports at Centennial Park is Tri focused and should be good for something too, along with quite a few bigger LSBs around town.

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Postby G » 23 Feb 2010, 10:23

Thanks Weiyun

The frame manufacturer responded that T726R fits the frame. This is one strange looking brake, with center pull cable exit!! Seen anything like it? Any ideas where I can get it from?


Image

http://www.tektro.com/02products/12qb.php

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Postby G » 15 Mar 2010, 11:12

Thank you everyone for your valuable inputs. The time trial bike is ready just in time for the Ironman (less than 2 weeks to go!). Here's how it finally looks:


Image

PeterOS
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Postby PeterOS » 15 Mar 2010, 12:17

G,
Have you taken it for a good ride yet. If so how did it go?
It looks awsome.
Well done.

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Postby G » 15 Mar 2010, 12:47

G,
Have you taken it for a good ride yet. If so how did it go?
It looks awsome.
Well done.
Yes, peter, took it for a spin yesterday. It feels quite efficient. I have been trying to reach you on your phone, but you need to charge it first! I want to have 200km on it by Saturday. You up for a ride tomorrow morning? 1hr ride??

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weiyun
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Postby weiyun » 15 Mar 2010, 13:00

Oh no... You forgot to put on the rear brake! :wink:

Nice. 8)

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G
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Postby G » 15 Mar 2010, 13:05

Oh no... You forgot to put on the rear brake! :wink:

Nice. 8)
haa! haa! The bloody rear brake is still pain in the smuggler.

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Postby Peter T » 15 Mar 2010, 14:27

Looks the business G.

Congrats on getting it all together.

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Stuart
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Postby Stuart » 15 Mar 2010, 15:50

G - The bike looks totally hot but is that an unpadded carbon saddle? and you're going to ride how far on it in speedo's ??!!

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Postby Terry » 15 Mar 2010, 18:30

Very nice.
but surely you could have found some hot pink bar tape somewhere

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Postby rhys » 15 Mar 2010, 20:53

Looks like something out of Mad Max (this is a GOOD thing). Does it make a lot of noise?

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Postby othy » 15 Mar 2010, 21:48

Needs a black bottle cage. Other then that it looks hot.

PeterOS
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Postby PeterOS » 16 Mar 2010, 08:00

Yes, peter, took it for a spin yesterday. It feels quite efficient. I have been trying to reach you on your phone, but you need to charge it first! I want to have 200km on it by Saturday. You up for a ride tomorrow morning? 1hr ride??
G,
Sorry I'm missing all calls and I didn't see this until it was to late, but I'm in the tapper mode now, so I'm just sticking to the same old routine.
See ya on Sunday for a ride.

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G
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Postby G » 17 Mar 2010, 13:46

G - The bike looks totally hot but is that an unpadded carbon saddle? and you're going to ride how far on it in speedo's ??!!
180k 8)
It's actually a pretty comfy saddle!

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G
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Postby G » 17 Mar 2010, 13:47

Very nice.
but surely you could have found some hot pink bar tape somewhere
Hi Terry
Sure I bought a pink bar tape, but it was baby pink, and wot I was looking for was hot pink. then I found these hot gold bar tapes, and hence went with them :D

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G
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Postby G » 17 Mar 2010, 13:48

Looks like something out of Mad Max (this is a GOOD thing). Does it make a lot of noise?
Not a lot of noise... the wheels are only 50mm deep - which is perfect for windy time trial, as I am a very light bloke ;)

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G
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Postby G » 17 Mar 2010, 13:50

Needs a black bottle cage. Other then that it looks hot.
This titanium cage was 10g lighter than the light carbon cages... but I guess it does look a bit out of theme.

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Postby yewenyi » 17 Apr 2010, 13:03

Image

timyone
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Postby timyone » 17 Apr 2010, 14:05

wow this thread is 7 pages long and i havent read it :D some thing about the word time trial and how to do some thing or other technical with a bike puts me off reading it :D

Far out that bike looks hot!@!

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G
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Postby G » 19 Apr 2010, 16:37

O ye ye, really happy with the bike. It is stiff as, and flies uphill. The 180 time trial during the ironman oz was a breeze!

Thanks to everyone for their valuable inputs without which I would have never been able to build it.

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G
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Postby G » 19 Apr 2010, 17:34

Here's it in action during Ironman Australia
Image


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