I like the idea of oval chainrings, that I want to try the more radical O.symetric Harmonic chainrings, but I don't know where I can get them here in the U.S.
- Tinker, Taylor, Tart
- Posts: 1998
- Joined: Sat Nov 29, 2008 8:00 pm
- Location: Sydney, Aus.
How many different positions are there for them?
How different do the different positions feel?
What happens if you choose the wrong position initially - would it feel horrendous?
Road Runner - how did you come to know that position 2 on one ring and position 3 on the other were 'right'?
Intrigued to know more, and sorry for the slight hijack KDub!
And I have the 40t inner ring in the 2 position, because that setup is best when I am climbing seated on the back of the saddle. And it also feels good at high cadence.
- In the power phase, the 53t chainring increases to 56t.
- Power phase.gif (1.36 KiB) Viewed 3329 times
- In the Dead phase, the 53t chainring decreases to 51t
- Dead point.gif (1.19 KiB) Viewed 3329 times
- Powerful Pete
- Posts: 4004
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- Location: Lima, Peru and occasionally in the Washington DC area.
Supercommuter: Jamis Renegade...pastatrails.blogspot.com
And you can call me Macktastik Honey Pete Kicks, thank you.
it was abandoned because of the complexity with working properly with front derailleurs.
2009 SR Pino
QC is a management function, NOT country of origin
The design of the Q-Ring allows you to 'tune' this area of highest leverage and the acceleration factor to suit your personal style, hence Road Runner's comment that he runs the big ring in position "3" and the small ring in position "2".
I was very sceptical about the rings, but I got a stupid deal on them fairly late in the Season and thought I would try them out for a lark. I ran them on a Professional SRM. I immediately liked the 'feel' of them in position "3". By the end of the Season, I had quite a decent history on them on an interval course that I use that I have many years of data on. While Rotor claims 5% increase in power, I would say it is more like 3% or 4%.
I always tell people that my information is based upon a very specific set of criteria and a limited sample of the entire spectrum of power production. I believed my own results enought to get three more sets. My only problem is that my MTB SRM is an older version and I have to run a 2x10 set with a round 'granny'.
I still run in position "3" on all my rings. I 'feel' best with that configuration. With respect to shifting, I run SRM cranks, so the chainring spacing is Shimano. There is no problem with shifting for any of Campagnolo 10 or 11 or for Shimano 7800 or 7900.
bcheung wrote:I had Q-Rings on for a couple seasons, and have now gone back to regular round rings.
Haven't really noticed much, if any, of a difference.
The first time I rode with the Q-rings, I also didn't notice any difference, so one month later I went back to round rings, and then was when I feel a difference.
I noticed that with the round rings, the dead spot was magnified and harder to mantain a smooth pedaling.
When you install the Q-rings, maybe you are not going to feel any difference because the oval factor is only of 11%.
With only 11% of ovality, you don't feel any sudden acceleration in each pedal stroke. So they only make you pedal more naturaly with less strain on the kness.
There is a theory that if you eliminate the dead spot, you eliminate the resting point because you will be pedaling only in the power phase.
If you want to feel a difference, get this rings:
FYI, the Qring effect is quite subtle and I don't notice any negative effects on my pedaling when shifting between my round outer and inner Qring.
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