On Sat, 2010-05-29 at 10:21 -0700, benzzoy wrote: > On May 29, 7:08 am, jandrews_nyc <jasonaschwa...@gmail.com> wrote: > > > > carrying a modest load, etc. I certainly don't feel like using > > anything bigger than a 48t up front and based on how I would like this > > bike to ride..I'm feeling something like a 44t / 28t compact double. > > I'm finding that my crankset choices are limited if I want to set > > something up as described. I don't want to spring for a TA, but > > aren't there other choices out there that would enable me to set this > > up? From my limited research, I think Shimano is out. > > Hi Jason, > > The traditional "compact" double has a BCD of 110mm. Since the > smallest chainring that will fit a 110mm BCD is a 34T, you won't have > any luck trying to squeeze a 28T chainring into any of the usual > "compact" cranks that are on the market. You could try using a triple > crank with 110/74mm BCDs and then leave out the outermost chainring to > make a 110/74 double, but you may have to get creative with chainring > bolts and/or spindle lengths. > > So it looks like you're stuck with either getting a relatively > expensive crank like the WhiteInd VBC or TA if you want the 44/28 > double. If you're willing to forgo the idea of a double, a cheaper > option is to go with mountain bike triple cranks. Those usually run > the chainring sizes you require (and then even lower) but may have > other undesirables such as general ugliness (!) and a wide Q-factor. > > I do have a bit of a question regarding your use of the NOS Simplex > front derailleur for a 44/28. As I understand, those Simplex front > derailleurs are usually designed for much larger chainrings. If so, > would they shift smaller chainrings well, being that the curvature of > the cage is mismatched? >
Or, if you could wait -- not sure how long you'd have to wait -- for this: http://velo-orange.blogspot.com/2010/02/grand-cru-crank.html you'd come closer. It's going to come with 46/30 rings. May be available this summer. -- 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.
