mupmalis@watarts.UUCP (mike upmalis) (04/03/85)
{*****Orville if we take the wings off we'll have a bike*****}
Shimano has come out with the bipace chainring set. The rings are
slightly oval and is supposed to optimize pedalling by improving
or increasin the torque. The pedals are least efficient at 12/6 oclock
and most efficient at 3/9.
My question for the netters is, are they any good?
While the best bike is a battle for small gains, 100 gms here 200 there,
would this slight or major advantage be offset by some other problem,
funny rhythm etc...
If somebody has seen something published, i would be interested..
--
~~
Mike Upmalis (mupmalis@watarts)<University of Waterloo>kfl@hoxna.UUCP (Kenton Lee) (04/04/85)
xxx Bicycling magazine published a couple of reviews of the Biopace chainrings last fall (October?). Both the reviews and the Biopace ads state that only certain types of bike riders will benefit from the Biopace (e.g. people who peddle slowly). -- Kenton Lee Bell Labs - WB ihnp4!wbscc!kfl or ihnp4!hoxna!kfl
wagner@uw-june (Dave Wagner) (04/05/85)
> (From mupmalis@watarts.UUCP (mike upmalis)) > Shimano has come out with the bipace chainring set. The rings are > slightly oval and is supposed to optimize pedalling by improving > or increasin the torque. The pedals are least efficient at 12/6 oclock > and most efficient at 3/9. > > My question for the netters is, are they any good? > > If somebody has seen something published, i would be interested.. There was an article in Bicycling magazine sometime last year about them. Basically, they felt that these rings were most suitable for the tourist, whose RPMs are not likely to exceed 80-90. In this case, the rings seem to decrease the strain on the knee. Most racers, however, found them ackward for spinning. Dave Wagner University of Washington Comp Sci Department wagner@{uw-june.arpa|washington.arpa} {ihnp4|decvax|ucbvax}!uw-beaver!uw-june!wagner "Oh no! I've got . . . . . HAPPY FEET!"
craig@hp-pcd.UUCP (craig) (04/07/85)
RE biopace articles: Bike Tech had a good article on the biopace system a few issues ago. It was written by the person at Shimano who did a lot of the development work.
jsgray@watmath.UUCP (Jan Gray) (04/28/85)
What is the difference between the "new" Biopace chainrings and the old ones (in that the older versions were said to be worse for spinning at high RPMs)? Is there any difference other than the number of teeth? Thanks, Jan Gray (jsgray@watmath.UUCP) University of Waterloo (519) 885-1211 x3870