Show me your roller cams, U brakes

[The Ken]

I'm waiting for a bike for this too, something mid - late 80's ...

 

[crconsulting]

Some Charlie Cunningham modified Suntour Roller Cam Brakes

 

[The History Man]

What does the thumbwheel cam do on the right side? Just fitted this instead of an Exage mountain.

 

[velomaniac]

Your picture shows a U-Brake not a Roller Cam Brake so not sure what right hand cam your referring too ?

 

[classen]

The thumb wheel is for adjusting the center-center distance of the bridge so that it can be fit to frames/forks with slightly different spacing between posts. Also might be useful for applying some preload in the system to help braking performance.

 

[The History Man]

Thanks. Makes perfect sense. Not sure why it's needed though.

 

[jimo746]

A couple for comparison...

And the Suntour XCD4050 fitted to my 88' Stumpy...

 

[classen]

Thanks. Makes perfect sense. Not sure why it's needed though.

Well how would you solve the problem of mass manufacturing a U-brake with a booster bridge that will fit posts that are 88, 89, 90, or 91 mm apart? Seems like a pretty ingenious solution to me. The other options being to provide an un-drilled booster that is drilled with the proper spacing at the time of installation (e.g. WTB) or possible providing slots instead of holes (e.g. MRC and many others).

 

[The History Man]

Was just that I have two exage mountain versions with no adjustment. Didn't think about the cam on setup and hasn't seemed to make any difference between the two types.

Very nicely engineered all the same.

 

[wtb_rider]

Wtb Phoenix with rollercam in the front and togglecam in the back


still need a booster for that, if somebody has a great idea where to get one, let me know....
brodie catalyst´s with xt and mrc



cheers kay