surly old man
Join Date: Sep 2006
Location: Carlisle, PA
Bikes: IRO Mark V, Karate Monkey half fat, Trek 620 IGH, Cannondale 26/24 MTB, Amp Research B3, and more.
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I have been dealing with a similar problem with narrow brake bosses (on the front of an old Trek 620 touring bike).
I think the advice to try smooth studs instead of threaded makes sense. I was forced to go that route because I just could not get the pad to angle radically enough to work on the narrow bosses. I did get it set up, but the braking power is pretty poor. It could be some other variables (that I am trying to tinker with), but I am increasingly sure it is the the pad angle. Good enough, maybe, but not really what I hoped for.
p.s., I think those Altus brakes have a brittle plastic collar around the spring that breaks easily. I hate them.
Cross Check Nexus7, IRO Mark V, Trek 620 Nexus7, Karate Monkey half fat, IRO Model 19 fixed, Amp Research B3, Surly 1x1 half fat fixed, and more...