Bio-Pace Question
02-01-12, 09:15 PM
#1
Bicyclerider4life
Thread Starter
Bio-Pace Question
Do 48/38/28 Bio-Pace chain rings have the same effective diameter as 48/38/28 round rings?
Thanks
Thanks
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02-01-12, 09:20 PM
#2
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Yes they do
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
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02-01-12, 09:28 PM
#3
Bicyclerider4life
Thread Starter
Thank you, I thought they did but was not sure.
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02-01-12, 09:28 PM
#4
Banned
circumference is the same, but the radius is varied.. D is 2xR..
in different parts of the rotation, that is their whole idea.
so on average it is the same..
in different parts of the rotation, that is their whole idea.
so on average it is the same..
02-01-12, 10:10 PM
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...meaning you need to check the FD clearance at the spots where R is greatest, and you can (should?) likely lower your FD if switching from oval to round rings. Nobody goes the other way, right?
02-01-12, 10:48 PM
#6
Bicyclerider4life
Thread Starter
I actually like the Bio-Pace
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"Whenever I see an adult riding a bicycle, I know there is hope for mankind." (H. G. Wells)
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Last edited by bicyclridr4life; 02-01-12 at 10:50 PM. Reason: add a line
02-02-12, 07:20 AM
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Actually ... I installed the Bio-Pace crank I took off another bike (only because I could not get the ring sizes I wanted) and put the Bio-Pace on another bike that had a cheap HEAVY as HECK non-replaceable ring Shimano crank, have to raise the FD about 3/16 inch it looks like.
I actually like the Bio-Pace
I actually like the Bio-Pace
02-02-12, 09:19 AM
#8
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Similar deal for me. When my brother gave me an 80's MTB (it was a size too small for him) that had good-condition BioPace rings, I couldn't resist the urge to transplant them onto my main bike. I can't perceive an improvement in efficiency or knee strain, but I like them anyway.
02-02-12, 03:13 PM
#9
Bicyclerider4life
Thread Starter
Especially when the ... shall we say ... "uninformed" call out "HEY! MISTER!! YOUR CRANK RINGS AREN'T ROUND! I'VE NEVER SEEN A CRANK BENT SO BAD!!! " 
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"Whenever I see an adult riding a bicycle, I know there is hope for mankind." (H. G. Wells)
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02-02-12, 06:05 PM
#10
Constant tinkerer
02-02-12, 06:14 PM
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I don't think they do. They are lower when the cranks are horizontal but higher when the cranks are vertical. The pedaling effort is lower except if you use clips or clipless pedals to keep pushing on the cranks when they are vertical, when it is higher.
02-03-12, 04:02 AM
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That's true, but a 48t ring will still pull through 24" of chain in one rotation, whether it's round, oval or square. You get a slightly higher gear at some points and a lower gear at others, but the average gear ratio is the same as a round one.
