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ScottM

Tensile brake clamps advice?

3 posts in this topic

I am trying to set up an old 26" comp frame (ZOO with 99mm spaced mounts) with an HS-33. The bike previously had a V brake with adapters and has an old DX32 rim which is about 38mm wide. The V brake works but the bushings on the arms are pretty worn out and I like the feel of hydraulic brakes I have tried so thought it might be a good time to try some on my own bike. 

I found a pair of Tensile offset clamps thinking they might work a little better for clamping the cylinders further inboard with the narrow rim. At this point I'm not sure, I guess standard mounts might have worked ok since in this position the offsets don't get me any extra clearance to mount the cylinders further in. It does seem like it would still be good to clamp the cylinders closer to their centers however? 

The problem I have now is that the Tensile clamps have little "ears" protruding on the portion of the clamp that would contact the brake bosses on the frame but the bosses are too wide for the brake clamps to sit flat with the little "ears" in the way. I checked the clamps against my Hex as well and it looks like they would have the same fit problem... Looking at some pictures it seems like Magura clamps are made the same way? 

Anybody have any advice for the best work around here? I think I could file the little ears flat but I wanted to get some advice first because I think it would take quite a lot of work to make sure I get both surfaces flat with respect to each other and I don't think replacement Tensile's are available if I mess them up. Alternatively I may try to get some aluminum washers to fit between the "ears". This would be easier but then the clamps won't have near the contact with the frame bosses. I mainly don't want to deform the bosses on the bike or not have a strong enough fit. 

Before I go too far maybe I should just bite the bullet and build up a wider rim or maybe just new V brake arms!? Thanks!

 

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Tensile clamps are designed to space pistons further outboard, so you won't get more than a couple of mm movement. How much meat is left on the pads you're trying to run? Could get proper old school and screw a second set of backings on if you're feeling particularly baller.

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New pads so plenty of meat. It looks like I only needed standard clamps after all? I held the cyclinders in place with the rim installed just now and it looks like it would work with standard clamps, at least until the pads wear down. My understanding is that I’ll have to move the cylinders in as the pads wear? I have only dealt with hydraulic disc brakes to this point. 

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