Some pics from a frame modification I am working on. By cutting out the existing English bottom bracket (BB) shell and replacing it with a Press Fit 30 (PF30) shell I can either run a PF30/BB30 crankset (not the purpose of this modification) or a PF30 eccentric BB. By swapping out the shell and adding a tube splitter on the drive side seat stay we will be able to run a belt drive.
Always good to see a frame getting raced.
The front triangle and chainstays are all brazed together. I should have the majority of the frame finished tomorrow with the fork and stem done shortly afterwards.
Well, Tom's frame is off to get ceramic coated and I am now starting on Mikes 36" commuter. As it is such a ridiculously big wheel size there is not much about this bike that is standard. While it is running a pretty standard 70 degree headtube the rake on the fork is a huge 75mm (vs. the standard 45mm on a normal fork). To have tire clearance in the chainstays we have to run a 83mm bottom bracket with the normal being 73mm for a mountain bike bottom bracket and 68mm wide for road. To provide stability for those giant wheels it uses a 170mm wide rear hub and a 135mm front hube (130-135mm is the norm for rear and 100mm wide is the norm for front hubs).
Normally with bike this big you have to do some funky stuff to the geometry to get someone to fit in between those big wheels, however since Mike is a pretty big guy the required manipulations are pretty minimal. The only real manipulation to the frame I had to make is curving the seat tube to allow allow for a shorter chainstay. Also since the head tube of the bike is so high up compared to a "normal" bike the downtube/seattube miter is pretty severe.
Tom's 650b full suspension frame is almost done. Just a little more time on cleaning up the brass fillets and it will be off to get a ceramic coat.
I was also able to snap a couple of pics of the Gateway Cup Mens Cat 4/5 and Womens 3/4 race this Sunday out on the Hill in St. Louis. The kids could only take so long of watching bikes making left turns so I was only able to catch two of the races, however what I did see seemed to have a really good turnout.