There were two versions of the oval rings. One was oval, and one was Biopace. Tried both of them back in the 1980's. I recall not liking the feel of the Biopace, but don't recall any shifting problems. It's my opinion that it was a lazy way to spin circles. Sort of like "dumbing down" a rider. The oval rings would tend to throw the chain on a fast shift. That made it dangerous for any aggressive rider. Was probably okay for a casual cruiser. To my recollection, there weren't any pros using either of these, though pros will use what pays the best (that's why they call them professionals!).
Steve Dahlquist Velochrome Frameset Painting V 559-592-6367 F 559-592-2585 C 559-967-3318 steve@velochrome.com 22582 Carson Avenue Exeter, California 93221 http://www.Velochrome.com
----- Original Message ----- From: Richard Reno To: Classicrendezvous@bikelist.org Sent: Wednesday, January 07, 2004 8:51 AM Subject: [CR](CR) Interesting crank/arms on Ebay
Those PMP L (pimple?) cranks show up every once in a while. The idea was that they would "center" your pedal stroke. Of course, all they actually did was add weight. At around the same time, there was a company selling an oval shaped chain ring that was supposed to do the same thing. I've never seen a bike built with either one. Has anybody on the list any experience with that oval 'ring? I would think there would be shifting issues...to say the least! Richard Reno Green Bay (wind chills of -15F) Wisconsin
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