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 Spinz@50
Another Rd question. Will a nine speed Rd work with a six or seven speed system if the tooth count and wrap are within specs? And can the H and L limits be adjusted for the six or seven speed shifters? Ya'll be patient with the noob. thanks Lp
It's all about 'lateral swing'. As long as the 9 sp derailieur can cover the distance from the smallest to the largest cog in the cluster 'laterally' you'll have no probs whether it's 5-6-7-8 or 9 cogs. Derailleurs themselves have no 'indexing', but do have limits to the distance they can travel horizontally. For example, you can use a 7 speed derailleur to cover a 9 cog cluster provided it has the swing distance required.
Currently, I'm using a Shimano Sora 8/9 speed derailleur rated at 27t limit on a 12x28 8 sp cluster. It BARELY makes it as the 'B' screw adjustment is cranked all the way, but it makes it and that's all that matters to me. The H/L limitscrews are set in normal positions and the system works fine. I've got a single 48t frt w/bar-end shifter.
In answer to your 2nd question as long as there's no indexing involved. The H/L limit screws are just there to stop the chain from falling off either end. Downtube, stem and Bar-end shifting are functionally the same, ie they're all friction/cable systems. Obviously, the quality varies afa smoothness, etc goes, but they're all pretty much the same technologically speaking.