#biopace
weird bike part of the day is Shimano Biopace cranksets and chainrings. it was Shimano's take on the "elliptical" chainring, which is meant to even out the power on the dead parts of the pedal stroke. while some riders liked it, it never really caught on and was dropped in the 90s.
November 15, 2025 at 1:24 PM
BIOPACE
March 24, 2025 at 7:28 PM
Biopace sighting.
😊
August 29, 2026 at 1:25 AM
Is that the new Biopace?
June 29, 2025 at 9:11 AM
I see shimano has redesigned biopace again.
November 14, 2025 at 7:41 PM
Random Hoo Koo E Koo #garyfisher #biopace
April 5, 2025 at 1:20 PM
This is correct. Oval and BioPace are opposites.

And yeah there are two different levels of BioPace.
August 22, 2024 at 2:00 PM
BioPace!!!

I think there are still some applications out there.
August 27, 2024 at 7:40 PM
Getting even fancier by adding the most advanced technology of the 1980s: The Shimano Biopace e g g 🥚 chainring
April 13, 2026 at 10:46 AM
I run oval chainrings, but current ones are 90 degrees off from BioPace I think? I still have a BioPace triple on my city bike 😂
August 13, 2026 at 5:17 PM
Die späteren, "Biopace II", waren meines Wissens ovaler.
June 25, 2025 at 6:36 PM
Say what you want, but I dig the Shimano BioPace toilet roll holders.
March 5, 2025 at 12:14 AM
Vielleicht ein moderates Biopace (also doch Glück gehabt)?

Eigentlich kann man Biopace nicht aus den Augen bekommen😂

"what has been seen, cannot be unseen"
June 25, 2025 at 6:29 PM
Okay, hatte es falschrum im Kopf.
Shimano Biopace – Wikipedia
de.m.wikipedia.org
June 25, 2025 at 6:39 PM
Das Rad von @velociraptormuc.bsky.social hat aber kein Biopace. Zum Glück.
June 25, 2025 at 6:19 PM
Just scored a new bike for free on Craigslist! It's got Shimano 105 gear, BioPace crank, and the Armadillo tires look good to go!

#cycling #pdx
February 16, 2026 at 11:20 PM
I've serviced tons of bikes with Biopace and it always felt weird to me on test rides. modern oval/elliptical chainrings feel a little more natural, but they also aren't for me. still, it's always good to have more options for people, especially when it comes to biomechanics!
November 15, 2025 at 1:26 PM
I don't know that I ever understood how they worked. BioPace and OvalTech chainrings came out shortly afterwards with similar promises, but at 1/4 the price.
August 13, 2026 at 4:53 PM
My ancient Shimano XT dual control levers, the ultimate cold weather cycling secret weapon.

Please, cycling deities, biopace came back; this can, too.
December 15, 2024 at 1:31 AM
ahem

Biopace-HP

HIGH PERFORMANCE
July 1, 2026 at 12:30 AM
Doch, ist ein Biopace.

Auch das erste Mal, dass ich eins in freier Wildbahn sehe und ich habe es mir immer „ovaler“ vorgestellt.

Man muss schon genau hinsehen.
June 25, 2025 at 6:27 PM
Liebes #BlueLz und andere Berufsgruppen: Wenn Ihr das Gefühl habt, etwas läuft aktuell oder später zu Beginn des Schuljahres nicht rund, dann könnt es sein, dass etwas *gerade* zu rund ist und nicht so oval wie ein #Biopace … was das ist, zeigt sich hier im thread.

Schul-/ #organisationsentwicklung
Die Tochter ist ihrem Rad entwachsen und sucht seit einer Weile ein Neues.

Radläden und die Onlinewelt abgeklappert … und am Ende bei Kleinanzeigen Liebe auf den ersten Blick (Tritt) bei einem 37 Jahre alten Stück.

Und jetzt bin ich neidisch 🧐
August 25, 2025 at 6:24 AM
Sweet. Mine is a ‘92, cantis not V-brakes, one-piece brake/shifter levers, 3x7 BioPace drivetrain
October 30, 2024 at 9:10 PM
Note egg-shaped Biopace chainrings, the carrying handle, lack of suspension forks (not yet developed) and parcel carrying by train!
June 8, 2025 at 10:10 AM