Bicycle Mechanics - Homemade grip shifters?
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10-01-04, 03:18 AM
I'd like to change over from my friction-type bar shifters to twist-grips. I was thinking I could persuade a couple of motorcycle throttle grips to do the job, but before I root through the local cycle salvage I thought I'd see if anyone has already undertaken a similar project, or if friction-type shifter grips are available.
SRAM still makes them in their low end Gripshift lineup.
10-01-04, 08:27 AM
I just checked out their website, and I didn't see anything that stated it was compatible with older non-indexed derailleurs. Which model were you referring to?
I just checked out their website, and I didn't see anything that stated it was compatible with older non-indexed derailleurs. Which model were you referring to?I duno what you are trying to do, but index shifters are generally not compatible with pre index or non index type derailers. A friction twist shifter, if that is what you are referencing,would be compatible with index or non index RDs.
10-02-04, 12:48 AM
That's exactly what I'm after -- a friction twist shifter. I'd been thinking I could modify a motorcycle throttle into one, but if they're available somewhere, that'd be the path of least resistance.
10-02-04, 02:45 PM
In Some of the replacement gripshift sets - only the right one is indexed. Maybe you could use another left one as your rear derailleur shifter. Just a thought.
Hm yeah I forgot the rears are always indexed. Front is easy, I think the MRX or something like that has the friction front.
10-02-04, 07:18 PM
Motorcycle throttle grips wouldnt work, because the bicycle derailler cable travel is too small - you would be overshifting all the time.
10-03-04, 01:26 AM
Cable travel on motorcycle throttles is varied. I've had some bikes you'd swear you needed two handfuls to open up, and then there are racing throttles with only about 1/4 turn. The latter would be useable as a shifter. I saw an aftermarket throttle that uses bevel gears, a la BMW 'R' series, to allow the cable to enter parallel to the bars. If the travel is acceptable, that'd be one answer at about $20 apiece.
The guy at the LBS also mentioned using front grip shifters on both sides.
10-03-04, 04:55 PM
I've seen friction type grip shifters on low end department store bikes made by Falcon. I don't know where you can get them other them finding a bike at a store and buying the bike to get them.
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