On Monday, September 22, 2014 12:37:07 PM UTC-7, Bill Lindsay wrote: > > My cousin manages a largish shop in Southern California. My brother in > law is close friends with the owner of Jenson USA. I saw my cousin and my > brother in law this weekend, and got two juicy rumors from Interbike. > > 1. Paul is making Disc brake calipers, called the Klamper. > Saw some criticizm of them already: Too small. Not enough heat absorption/dissipation. Well, that is unless they are designed to continue to work when they are red hot. Also, compared to Avid bb7(?) with critcizm of those disc: The most common overheating issue with BB7 brakes is that the plastic adjusting knobs melt.
Being a mechanism with close fitting moving parts, differing rates of thermal expansion have to be considered in the design of a mechanical caliper. If not designed properly, the mechanism could jam when overheated. The BB7 probably benefits from the ball bearing mechanism, which is probably tolerant of some mis-match in thermal expansion. I hope the designers of the *Paul* brake have also accounted for this. Yeah CTE mismatch is usually a major problem with a mechanical assembly that involves heat. Ideally, all the components in an assembly are made of a similar material to minimize various thermal expansion rates. You will have stress build up on an assembly just sitting around by heating and cooling it let alone having it functioning. With that said, thermal expansion and heat sinking are two different things and must be addressed separately. Moreover, being Paul, you know its going to be pricey! Nevertheless, people like Paul and they'll probably sell all the make! Good Luck! > 2. Phil Wood showed a 13 speed cassette hub. > > I don't know if the hub thing is a joke, like Sheldons ultra microdrive > thing. I'm curious about disc brakes, but have never felt the need to have > them. Paul getting in the game is interesting. > -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/d/optout.
