@Bioteknik What’s your analysis of this study regarding oval rings Effects of a Non-Circular Chainring on Sprint Performance During a Cycle Ergometer Test - PMC

Higher maximal force which is statistically significant. Table 1 shows no significant increase in flywheel velocity though.

I’ve just skimmed the article. Will read later in more detail, but initial thoughts suggest too many holes in that study to draw any meaningful conclusions. Raises to many questions… Sample of 20, and all from a similar background. We can’t say that this is generalisable to cyclists as a whole. …

Power inflation (crank based PM’s with elliptical rings)…I can’t tell from the “Data Collection” section if they compensated for this or not as I’m not familiar with the equipment. If they didn’t the results are flawed I believe. All I’ve read over the years is the mechanical advantage of the down…

That’s an interesting article. The argument of no metabolic rate change = no effociency gain is an interesting comment. Seems impossible to study effect on knee force or other manufacturer claims.

I had a crazy thought while reading this thread, if ya’ll’ll (how’s that for a contraction?) kindly indulge me: Is it possible to mount an elliptical ring in exactly the wrong orientation? (Never owned or ridden a nonround ring, so I dunno.) That is, can the ring physically be mounted such that th…

[image] Teuthis: Is it possible to mount an elliptical ring in exactly the wrong orientation? Just ask the Shimano Biopace design team…

[image] iracebikes: Higher maximal force which is statistically significant. Table 1 shows no significant increase in flywheel velocity though. This is what i noticed as well. Measured power was higher, but it didn’t produce a higher speed.

The strain gauge was mounted on the friction belt that surrounded the flywheel for measurement of the instantaneous friction force applied to the belt. Shouldn’t be any inflation from crank based measurements.

I was wondering when somebody was going to mention Biopace chainrings. I remember when those came out - late 80s/early 90s, then 6 months later everybody had patellar tendinitis and they disappeared from the market. Are the new ones different somehow?

Qring effectiveness

Equipment

KorbenDallas April 1, 2019, 10:46pm 5

Tom A from Slowtwitch posted this article years ago about how the ankle negates the elliptical rings mechanical advantage (the knee and hip don’t see the effects…). Fascinating stuff if you’re a bike nerd.

Topic		Replies	Views
Oval Chainrings.. Thoughts? Equipment	75	13910	November 29, 2020
Oval Chainring on Road and MTB Bike - Pros/Cons Equipment	34	8882	December 19, 2019
Should I swich to an oval chainring? Equipment	11	538	December 29, 2024
Oval chainrings on road/gravel Equipment	7	2836	April 10, 2020
Oval Chainrings and power differences when using a trainer for power? Equipment trainer , power-meter	10	3184	April 3, 2021

Qring effectiveness

Related topics