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I'm starting to see various versions popping up again lately from both indie manufacturers (Moto) and main line (Shimano). The concept always seemed to have some validity to me. Anyone using them or have any knowledge of the new crop?
 

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Do a search, or check Sheldon Brown's site. They make a reapparance every 10 to 20 years or so, getting much hype. Shortly after the hype falls away, no one gets them for another 10 to 20 years.
 

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Discussion Starter · #3 ·
Peanya said:
Do a search, or check Sheldon Brown's site. They make a reapparance every 10 to 20 years or so, getting much hype. Shortly after the hype falls away, no one gets them for another 10 to 20 years.
Ha! Kinda like the 17 year locusts??

Yeah, I recall the other visits as well, but I sense that there must be enough science behind the concept to this point to possibly amount to something more.........or not.
 

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its so weird that it happens, haha. i had a long thread on this not too long ago in components, and the conclusion was that eccentric chainrings such as the RotorQ chainrings ARE NOT more efficient and DO NOT make you faster. i guess i'm sticking w/ round...
 

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Was any research done on the various rings, e.g. big vs. small. I could see why a eccentric 52 would not be much use. But I have wondered (since my last eccentrics rings - 1987) if an eccentric small ring would be of use. Maybe only the granny on mtbs and roadbikes with triples? Seems like it'd be.. could be of benefit for very low cadence climbing.
 

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Research

OldZaskar said:
Was any research done on the various rings, e.g. big vs. small. I could see why a eccentric 52 would not be much use. But I have wondered (since my last eccentrics rings - 1987) if an eccentric small ring would be of use. Maybe only the granny on mtbs and roadbikes with triples? Seems like it'd be.. could be of benefit for very low cadence climbing.
Shimano provided research on their BioPace rings PROVING that they were 3% more energy efficient. Of course it's just possible that those lab results didn't transfer to the real world all that well.

I will let the "market research" speak for itself. Various forms of eccentric chainrings have been around since the late 1800s and each and every one has claimed 1) imrpoved efficiency and/or power and 2) to have corrected the problems with the previous incarnation. And yet, despite these repeated successful designs, they just never seem to catch on or last in the market. I wonder why that is? Enquiring minds want to know!
 

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skyliner1004 said:
its so weird that it happens, haha. i had a long thread on this not too long ago in components, and the conclusion was that eccentric chainrings such as the RotorQ chainrings ARE NOT more efficient and DO NOT make you faster. i guess i'm sticking w/ round...
My first post here... I don't agree with your conclusion. You only have to look at the widespread use of a ring like Rotor's in Europe - used in both road and mountain biking disciplines. I don't think things are as 'clean cut' as you describe.
 

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Everything old is new again. For a little awhile.

Then... poof, it's gone again.
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markw1970 said:
You only have to look at the widespread use of a ring like Rotor's in Europe - used in both road and mountain biking disciplines.
The problem is that widespread use does not tell you if a product works or not. This is particulary true in sports, where in a quest for better performance, millions of people spend large sums of money to buy products of no value whatsoever.
 

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P. T. Barnum

frmrench said:
I'm starting to see various versions popping up again lately from both indie manufacturers (Moto) and main line (Shimano). The concept always seemed to have some validity to me. Anyone using them or have any knowledge of the new crop?
P. T. Barnum said "There's a sucker born every minute" In the 20 years since Shimano Biopace there are at least 10 million new suckers. I guess that is a good market
 

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I have a 1989 Cannondale with a Biopace 52/42. Frankly, I can't tell the difference between it and a 1990 Trek with round chainrings. It sounds a lot like the golf ball ads that promise longer/straighter shots. Sure, maybe in some contrived lab test, but no effect in real life. Do any pros use eccentric chainrings? Presumably their teams have the money, gear, and motivation to go after even a small efficiency gain.
 

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bike981 said:
Do any pros use eccentric chainrings? Presumably their teams have the money, gear, and motivation to go after even a small efficiency gain.
More likely, because a sponsor is paying a great deal of money to get their component visible.

All RotoR has to do is put their rings on a bike, and Paul and Phil will stop commentating about the race for 2 minutes while they wax poetic about the damn rings.
 

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markw1970 said:
My first post here... I don't agree with your conclusion. You only have to look at the widespread use of a ring like Rotor's in Europe - used in both road and mountain biking disciplines. I don't think things are as 'clean cut' as you describe.
This is absolutely true. My observations during my expensive training in Europe has shown me that Rotor chainrings create a huge performance advantage in Europe. However, as shown by the nonpresence in the US, the Rotor chainrings do not provide a benefit while on US soil. As such, I have a set solely for use in Europe.

Markw, what are you talking about? I lived and trained in Belgium for a year and didn't see one pair of Rotor chainrings. I just saw a whole bunch of stock Madones and Eddys. Furthermore, observations of this nature are fundamentally flawed. I broke a bottle cage and went to the bike shop and bought their cheapest bottle cage. I was surprised to see they had a TA Specialties bottle cage. Look up TA Specialties. In America it's a VERY high-end brand... very boutique. There? Not so much. Obervations there say TA is cheap, low-end. Here, they say TA is insanely high-end.
 

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markw1970 said:
Wow some closed minds out there... surprising really.
Nah. It's just that many ppl here have seen the trends come and seen the trends go, so they don't get all exciticated about the umpteenth marketing push for non-round 'rings.

It's called 'experience', not a closed mind.
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My favorite part of Shimano's marketing BS around this was that after going to Biopace, then to a less aggressive aspect ratio, they went to (IIRC) "Roundtech" That name made me laugh. It was as if the marketing guys are telling you, "Yo man, these chainrings totally revolutionary. They're -wait for it- ROUND! Be smart and upgrade those dated oval chainrings that we were hyping 3 years ago, they're no good for spinning"
 

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Kerry Irons said:
Not to be confused with old age! :)
LOL. I guess it's a matter of degree, eh? :wink5:
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