Many years ago, I tried this on a mountain bike. It didn't work well precisely because of what Allan in Portland mentioned, that is the normal/routine bumps and jarring can derail the chain, sometimes at the most inopportune time. Because my mountain bike at that time had a 11-28, the chain had to be long to wrap around that range and the rear derailleur cage wasn't nearly strong enough to provide adequate chain tension. That's probably why CX bikes have a chain keeper.
If you run a chain guard, it may help things (didn't try) and certainly the flexy chain and shift ramps on modern chainrings do not help. Why the aversion to a front derailleur? On Oct 7, 12:22 pm, Joe Bernard <[email protected]> wrote: > Ok, I've got this gorgeous silvery green Hilsen frame Rocky sold me, and I'm > conjuring up build options. I'm thinking of doing a semi-Quickbeam-ish > thing: I have an IRD 13-32 7-speed freewheel on a Phil hub..thinking of > adding my very-most-super-cool American CNCed Precision Billet rear > derailer, and a Shimano XT 8-speed-era crank with the granny removed for a > 42-32 double. No front derailer, shifting Quickbeam style. > > Will I have any trouble with the chain leaping off the cranks during rear > shifts? > > Joe Bernard > Fairfield, CA. -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/rbw-owners-bunch?hl=en.
