TurbineBlade

I noticed that nearly everyone mounts cantilevers to the middle (or 2nd) hold on the frame mounts.

I used to run tektro oryx brakes and had great power with a low yoke and the pads spaced pretty far toward the rims.

Then, I got larger rim wheels and had to respace the pads a bit because they were too close for it to work.

I was just wondering, that with the larger rim wheels if I could have simply mounted the posts on the top hole of the frame and not had to respace..? Is that how those holes work? I know they increase or decrease return spring tension, but I was wondering if using them can actually allow you more control over brake leverage in any way.....by positioning the brake arms further outward at rest.....never thought to mess with them.

Thanks, I know it's a weird question.

reptilezs

the 3 holes you are talking about are for spring tension, not mechanical advantage.

fietsbob

you need to lengthen the straddle cable, if you cut it after lowering the Yoke,
and dont have enough past the pinch bolt,
then you need to buy new transverse cables.

BCRider

Yep, they are just the return spring tension. You can correct the issue with wider rims to some extent by using a thinner overall brake pad. I ran into this with my latest buildup, a Soma Double Cross that is using wider 29'er rims and 28mm tires. The arms were leaned out at a crazy angle with the stock pads that came with the brakes I got. I switched to thinline mountain bike style pads and fiddled the cup and ball washers around to put the thinner ones on the inside. This corrected the geometry so the arms came back to the proper angle.

A subsequent uncorrectable squeal issue with them was fixed by cutting away the first leading (most rearward) segment of the pads to effectively shorten them down to the same length as road pads.

TurbineBlade

That answers my question! Thank you.