V brake problem

[FC&P2C]

A boy racing at my bmx track got a new frame. Geometry has evolved on bmx's (as all bicycles) too longer front ends but shorter chainstays.

Problem is now with the rebuild his v brake's brake blocks cant reach the brake surface of the rim. Yes this can be solved by moving the rear wheel back but the whole idea is to have the rear wheel as close to the bb as possible as this is the modern thinking about bmx geometry.

Are there v brakes out there with longer adjustment on the brake blocks? Does anyone maybe have an old vbrake at home with more than normal adjustment.

All help appreciated.

[RodTi]

What exactly do you mean? I've absolutely no knowledge of BMX frames (anymore) - so you'll need to build a picture in words (or take a blinkin' photo!!)...

 

Your description of moving the wheel closer/further away from the BB is what's confusing me... How do you do this - do all BMW frames have horizontal/adjustable dropouts?

[FC&P2C]

Of course they do have horisontal drop outs as any single speed. How else will you adjust the chain tension 100%.

A Vbrake bolts to the frame.

Then the brake block can adjust to line up with the brake surface of the rim.

I need a vbrake that can adjust the brake block more than normal.

[KDEE]

Hi FC,

 

I assume the frame is a size up from the previous? Junior/Expert to Pro or similar? Normally the problem comes when we use 1/1/8 wheels in a frame that would normally take 1.5 wheels. Presume the v brake currently is a Mini?

 

A VPS adjustor should take care of the problem... Not sure who has in SA, ones in the pic are Bombshell.. Otherwise ask around over the weekend at SA's, someone must have..

 

A normal Deore MTB V Brake might work as well, we have a normal V brake on a Pro concept Junior which works... just..

Edited March 31, 2011 by KDEE