I concur. If you ride the bike only on smooth roads you should be fine, but if you ride on bumpy surfaces you will eventually drop the chain. I run a single chainring on my 29er MTB and on my cyclocross racing bikes, with inner and outer chainguards. Without the guards I would drop chains all the time. At the very least you should install an inner guard like the N-Gear Jump Stop to decrease the risk of inner drops, but you will still be vulnerable to outer drops.
Now, this is an extreme example, but check out how much the chains jump around in this cool video of Paris-Roubaix at around 2 minutes in: http://youtu.be/3QSpuhIQg1A Your chain will jump around like that if you descend on a trail and hit a bump. David G, Madison WI On Sat, Oct 8, 2011 at 12:26 AM, benzzoy <[email protected]> wrote: > 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.
