Michael, You should definitely measure BB drop with a set of wheel on first. Take a pair of 700c or 27" wheels and measure the drop.
I converted a Serotta CRT that had 80mm of BB drop (which means a fairly low BB) to 650b, with a resultant 248mm BB height with 32mm Grand Bois Cypres tires on. It was my wife's main bike for a while, and with 165mm crank arms she almost never struck the pedals. Franklyn On Dec 23, 7:26 am, MichaelH <mhech...@gmail.com> wrote: > This may not have much Riv content (yet) but I think this is the list > with the most experience in this subject. > > I had been thinking about converting my '84 Trek 620 frame to 650B, > but had almost shelved the project over concerns that the BB would be > to low, since this frame was originally designed for 27" (630mm > wheels) and I was afraid that even with bigger tires I would loose > about 20 mm of height if I converted to 584. (I'm assuming > ((630-584)+10)/2) Then I read a very positive bike review in the > current issue of BQ of a 650B with a bb of 235. Jan Heine said he > didn't experience any pedal strike, except when going over curbs. I > haven't been able to get a good fix on the current frame, which is > hanging up with out any wheels, but would be surprised if it's below > 254. I will need to remove the canti studs, so I'd really like to be > pretty sure before I start down the road, or shop floor as the case > may be! > > Can anyone shed some personal experience on this? > > Thanks, > Michael -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to rbw-owners-bu...@googlegroups.com. To unsubscribe from this group, send email to rbw-owners-bunch+unsubscr...@googlegroups.com. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
