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- Xref: sparky rec.bicycles.misc:1786 rec.bicycles.tech:2862
- Newsgroups: rec.bicycles.misc,rec.bicycles.tech,aus.bicycles
- Path: sparky!uunet!gatech!destroyer!cs.ubc.ca!uw-beaver!pardo
- From: pardo@cs.washington.edu (David Keppel)
- Subject: Re: Automatic transmissions for bikes
- Message-ID: <1992Dec30.070634.15469@beaver.cs.washington.edu>
- Sender: news@beaver.cs.washington.edu (USENET News System)
- Organization: Computer Science & Engineering, U. of Washington, Seattle
- References: <1992Dec27.224239.2958@sifon.cc.mcgill.ca> <1992Dec29.182213.15085@pt.com> <tommy.725663704@hoodlum>
- Date: Wed, 30 Dec 92 07:06:34 GMT
- Lines: 25
-
- >rkd@pt.com (Ray Downes) writes:
- >>[Many casual riders rarely shift well, using just 3-4 gears.]
-
- In article <tommy.725663704@hoodlum> tommy@boole.att.com writes:
- >[Solvable! Linkage on a dept. store bike shifted front & rear.]
-
- If we're only worried about the casual riders, it's even easier than
- that, but generally doesn't work for *marketing* reasons rather than
- technical reasons.
-
- Use just a rear derailleur.
-
- 11-13-16-19-23-28-34 gives more than a 3:1 range (30" to 100") with
- modest steps between gears, reshuffle cogs to suit your favorite gaps.
- Compared to a stock gearing setup it weighs less, has fewer things to
- break, costs less, shifts passably under load, is never confusing
- (move the lever that way for harder gears, this way for easier gears),
- doesn't have "illegal" gear combinations, can be built using existing
- freewheels and freehubs ... and people won't sell it.
-
- I've been pushing this kind of gearing for over a decade and bike shop
- owners, managers, and floor people alike say "It wouldn't sell." If
- they aren't willing to sell it, it won't sell.
-
- ;-D oN ( Mark It Place ) Pardo
-