Join Date: Feb 2006
Location: nashville, tn
Bikes: Commuters: Fuji Delray road, Fuji Discovery mtb...Touring: Softride Traveler...Road: C-dale SR300
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Originally Posted by mcoine
Have you actually experienced this?
Refering to the chain falling off the chainring when shifting. This drove me crazy and it got to the point where it was happening on virtually every commute. The culprit turned out to be the ramped chainring from the original crankset. Rocket Ring makes a bmx chainring w/110mm and 130mm bolt pattern. This is about the cheapest option...I've got 2 bikes set up w/them for commuting. 48t to 38t are the size ranges. Available @ bikepartsusa.com. harriscyclery.com Vuelta makes TT chainrings up to 60t unramped, but they're expensive...80-90.00 per. The RR are 15-20.00. FSA has a series of 'messenger' chainrings, but they're expensive, also.
Get some bmx chainring bolts or go to a hardware store for 3/8" star washers to take up the slack of the missing chainring. Single cr bolts are a much better option, though.
Make sure to size the chain properly, also. sheldonbrown.com has instructions on how to do this.
Just recently I purchased the Sugino 103mm bb and the matching 48t single crankset from universalcycles.com and have to say I'm very pleased w/t setup. The bb is very smooth. I use the setup w/an 8sp cassette and old Shimano bar-end shifter. The next most narrow that I know of other than the Phil Wood 103mm bb are a Shimano 107mm or Stronglight 107mm. Both are available at bikepartsusa.
BTW, since going to the unramped single chainrings I've never had a chain fall off when shifting on either of my commuters or my roadie.