Bio Pace Rings
12-01-09, 12:53 PM
#26
Bicycle Repair Man !!!
Well, Sixty Fiver, I guess I spoke to emphatically. I run a high cadence. Even with the very mild distortion on the big ring in biopace, it still always felt a little funny. As I said, the small ring drove me crazy. I think it was probably optimized for an rpm of something like 60. But you are probably right. They probably worked very well for certain people.
I think the problem with the whole concept is you need more distortion from round the slower the cadence goes. That makes biopace and other eliptical designs not generally applicable.
I think the problem with the whole concept is you need more distortion from round the slower the cadence goes. That makes biopace and other eliptical designs not generally applicable.
I also liked the BP granny for hill climbs as it does aid in smoothing out the power delivery and for maintaining spin under high loads.
A lot of people here are repeating misconceptions that were caused by Shimano when they said the BP rings were optimized for < 90 rpm when this is not actually the case.
I am also happy with round rings... many people have told me I have one of the smoothest pedal strokes they have ever seen... you have to be able to do this if you spend half your time on a fixed gear and like to descend at ludicrous speed while retaining a gearing that will also handle the trip back up the hill.
12-01-09, 09:54 PM
#28
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I have the 600 bio pace on my Bianchi sport sx 1989? light action. It has 13 to 18 cassette 52/42 chainring. Since i just started riding again after 45 years i have just gotten used to this bike. It feels great, i have my cadence up to 80 to 90 now riding about 400 miles a month. It has actually made my weak left knee better(old baseball injury). No swelling or soreness. It keeps the chain on with no problems. I need to put together a bike with better gear ratios so i can start climbing, then maybe i can feel the difference.
12-01-09, 11:50 PM
#29
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Here is a link to a study suing track cyclists doing a 1000 meter time trial. Interesting...
12-02-09, 01:17 AM
#30
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I'd used two similar Hybrids; one with BIO Pace one without. I found the BIO Pace a benefit on up hill climbing. Perhaps it's my mashing ,stand-up sytle as I lived in a hilly area. Another Road bike I rode breifly had BIO also and liked it. No more or less than similarly greared bikes and yes, I DID notice VERY few thrown chains and wouldn't have even remembered that, had a member not just mentioned it.
Regarding the "newer type" of non-round rings ? Not sure but they're different. A member here gets
REALLY ill when a comparison is made between the two styles. He ragards himself as expert in all things chain rings I suppose. He asserts that the old style, original BIO Pace were designed "backwards"
Regarding the "newer type" of non-round rings ? Not sure but they're different. A member here gets
REALLY ill when a comparison is made between the two styles. He ragards himself as expert in all things chain rings I suppose. He asserts that the old style, original BIO Pace were designed "backwards"
12-02-09, 02:59 AM
#31
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I used to use them, thought they were really great and had less knee soreness. Then I couldn't get them any more so I went back to round chainrings and didn't notice any difference. Interesting to hear they are back but I don't think I'll try them again. I don't know if it makes a difference but over time I've migrated to wider ranges of gears so now I have a 16" low and a 118" high and I think maybe being able to spin up the hills makes the Biopace unnecessary. Funny thing about the wide gearing - once you get used to it you really don't want to go back.
12-02-09, 10:18 AM
#32
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Here's a link from Rotor. This might address some issues about its benefits and its difference from the Bio Pace
https://www.rotorbike.com/nueva/pdf/Q...oadBikesEn.pdf
https://www.rotorbike.com/nueva/pdf/Q...oadBikesEn.pdf
