Brake width - Wider rims

rja

Hi,

Have just bought some wider aero wheels for my bike, but have a question regarding brake set up.

The new rims are 27mm wide and with new recommended brake block theres very little (read: no) clearance between the blocks and the rims.

I have slackened the cable tension, and wound out the adjusting bolt on the top but still don't really have enough clearance.

Do I need to change the concave washers to narrower ones on order to make more space - it's the only way I can see to get more room!

Thanks,

RJA

mrdsgs

bit radical, but file off/wear down some of the brake blocks?

rja

Ha ha, this had crossed my mind as a last resort! I probably need 3-4mm total!

47p2

If you take the cable off the caliper would there be enough clearance?

rja

Theres not enough room with everything maxed out, and cable not attached.

cycleclinic

Thin pads, I do not know which to suggest though. I fear I will have the same issues with my 25mm rims and the brakes I have.

Or disc brakes but that means a new frame and fork. I think that will the new trend with disc, really wide rims.

rja

I would love to get a new frameset to accomodate the wheels. Would probably mean new hub/wheels for disc brakes in anycase!

I've got no chance of getting a new bike past the Secretary of Finance!

cycleclinic

Ever thought of a off balance purchase. I have three bikes my wife does not even know about!

speedy119

If the rims are carbon then Mavic CXR carbon pads could be the answer. These are slightly shallower in depth than conventional pads.

rja

speedy - The rims are carbon I'll have a look at the Mavic pads spec. Do you own them?

speedy119

No I don't but I have worked with the cxr wheels and the relevant pads. The pads are slightly narrower dimensionally to compensate for the wider rim section.