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- Xref: sparky rec.bicycles.misc:1774 rec.bicycles.tech:2853
- Newsgroups: rec.bicycles.misc,rec.bicycles.tech,aus.bicycles
- Path: sparky!uunet!think.com!rpi!psinntp!psinntp!ptsys1!rkd
- From: rkd@pt.com (Ray Downes)
- Subject: Re: Automatic transmissions for bikes
- Message-ID: <1992Dec29.182213.15085@pt.com>
- Organization: Performance Technologies, Incorporated
- References: <1992Dec27.224239.2958@sifon.cc.mcgill.ca>
- Date: Tue, 29 Dec 1992 18:22:13 GMT
- Lines: 51
-
- In article <1992Dec27.224239.2958@sifon.cc.mcgill.ca> marc@gauss.math.mcgill.ca (Marc Sokolowski) writes:
- [snip-snip]
- > For me it is inevitable that not only autos will become a
- >significant portion of bikes, including race bikes, but will very rapidly
- >dominate, with only high quality manual transmissions surviving in high-end
- >equipement. This because bikes are getting more and more popular for a
- >boring task called commuting, and because of the similarity of evolution
- >with cars, as autos got extremely popular (at least in NA) when high torque
- >V6 and V8's that became available starting in the 50's only needed 3 forward
- >speeds. Here, it's high performance electronics and miniturization of
- >sensors, connexions etc... that will do the trick.
- >
- > Marc
-
- I've ridden with a fair amount of what I'll call casual riders,
- especially during the pre-index days, who wouldn't or couldn't figure
- out how to use their multi-gear bike. Many riders even today, owning
- 14-24 speed bikes, don't know how to get the next higher gear ratio,
- and tend to struggle along with same maybe 3-4 gear ratios (with at
- least one of those being a "bad" gear). Worse yet, some manufacturers
- chose very poor gear combinations, some even with 3-4 "good" gear ratio
- duplicates!
-
- For "the masses", who have no interest in swapping gears, instead of a
- automatic transmission, how about a intellegent shift lever, i.e. one
- that decides what the next higher (or lower) gear-inch combo is and
- single or double shifts as required.
-
- I'm picturing a single lever, perhaps using a shift drum as in some
- motorcycle transmissions, where a single shift "up", does a single or
- double shift as required. The drum could be matched with predetermined
- chainring and freewheel/cassettes "sets" (manufacturers would love
- this), dealers could alter the "set" as required to meet the
- rider/terrain requirements. The drum would also be "programmed" to
- disallow bad gear combinations.
-
- This would retain almost all of the current drivetrain design and
- components, easing the burden on manufacturers and dealers.
-
- I'm all for sharing my current commute route with hundreds more bike
- commuters - don't think it's going to happen till bikes are much more
- casual-rider friendly. Relatively flat commute routes are one thing -
- the gear-naive might get by. Stick a few hills in the way, or a couple
- of windy days, and they'll find it either too time consuming and/or too
- hard and bag it.
-
- Just a thought, probably all wrong ...
- --
- Ray Downes, Performance Technologies Incorporated rkd@pt.com
- 315 Science Parkway, Rochester, New York 14620
- Voice - (716) 256-0200, FAX (716) 256-0791
-