The math works thus: 700C diameter is 622 650B diameter is 584 difference of 38mm half of that is 19mm
the 650B wheel drops the entire bicycle 19mm. Then subtract the difference in tire size. 650B tire is 38mm 700C tire is 32mm difference is 6mm Hence the 13mm, because the 6mm bigger 650B tire will raise it back up a smidge from the 19mm drop. 13mm BB drop means a bit more likely to scrape a pedal, and a bit less clearance under the chain ring when mounting obstacles. The vertical clearance gained is 13mm, because the tire height does matter there. 13mm = plenty of room for fenders. The difference in brake reach is 19mm, because the brakes don't care about the tire height. 49 + 19 = 68mm brake reach. The 55 to 73mm range of the Tektro R559/Silver brakes make them perfect for this, and I'm pleased with their performance. I put Kool-stop pads in mine, though. Feel free to call Rivendell to ask. I did. They told me to mind the BB drop, since my early Road Standard has a low BB to begin with. That's all they said. But they're very nice folks out there, and won't mind telling you the same. Tim On Wed, Oct 23, 2013 at 7:56 PM, Michael <john11.2...@gmail.com> wrote: > The R559's are easier to set up and adjust, in my experience. >> > > But remember to run it by the folks at Rivendell, there may be issues we > don't think of or know about. > > -- > 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 rbw-owners-bunch+unsubscr...@googlegroups.com. > To post to this group, send email to rbw-owners-bunch@googlegroups.com. > Visit this group at http://groups.google.com/group/rbw-owners-bunch. > For more options, visit https://groups.google.com/groups/opt_out. > -- 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 rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/groups/opt_out.
