| Title: | Bicycling |
| Notice: | Bicycling for Fun |
| Moderator: | JAMIN::WASSER |
| Created: | Mon Apr 14 1986 |
| Last Modified: | Fri Jun 06 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 3214 |
| Total number of notes: | 31946 |
Shimano has developed a prototype compact front shifting
crankset, labeled the FM-5, that features five different
gear ratios within a small chainring-shaped gearbox. By
combining the five-gear front shifter with next year's
expected seven-speed Deore XT rear SIS system, you may be
able to select from 35 speeds! However, the FM-5 is not a
derailleur, because it doesn't derail the chain. Activated
by a normal-style thumb shifter, it does all its shifting
by engaging and disengaging shifting dogs that lock in
selected gears. When the rider clicks the thumb shifter to
the next gear, a spring-loaded pawl is moved into one of 5
gear combinations. Shifting can be done even when sitting
still, because the pawl and dog shift system is meshed in-
stantly with the next forward chain movement. Shimano en-
gineers designed it for the massive Japanese domestic city
bike market. The prototype is not available in the U.S.A.
Mike
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 698.1 | 175 speeds? | BANZAI::FISHER | Keep 'em rollin' | Fri Jun 03 1988 09:38 | 9 |
I know a hacker who would put that on in together with a 5 speed freehweel and a 5 speed sturmy archer hub, let's see, that's 5 times 5 times 5 times 5 -- no got carried away 5 * 5 * 5 -- 125 speed bike. I can see it now, "which one do I use for flat to lightly rolling, with a small dog chasing?" ed | |||||