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Old 01-14-08, 12:35 PM   #1
sp00ki
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Good gearing for rollers (high cadence)

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I'm buying a set of rollers next month, and will be purchasing an ultra cheap "track bike" ($75) for sole use with the rollers. I already have a trainer setup for doing resistance and sprint intervals, but wanted to use rollers specifically for improving high cadence form/aerobic condition on alternate days.
I'm thinking a very agile gearing will force me to do high rpm, and eventually improve my form on descents/all out sprints.
What gearing is too "agile" for rollers? I understand that part of the physics behind balancing on rollers is spinning your wheel, so i don't want it to be so low that the rollers are rendered useless, but i don't want it to be too high as to offer any resistance. I don't have experience on rollers w/a low gear ratio, so i'm kinda clueless as to how much the lower ratio will inhibit effective rolling. My TT bike is currently in pieces, so i'm thinking a good recommendation is my best bet to avoid swapping out too many chains/chainrings (time/money).

Anyone with experience have a suggestion?
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Old 01-14-08, 01:08 PM   #2
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Well I've ridden a 39/27 on rollers and that doesn't offer much (if any) resistance. I would think you'd need a little resistance to work against though.

What are your options for track gearing? I don't think I've seen a 27 tooth singlespeed cog...
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Old 01-14-08, 01:14 PM   #3
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woah... that's alot lower than i was considering.
partially answers my question, though: if it's possible to ride on 39/27, i shouldn't have too much trouble riding 41/17 or so (22 is the most teeth i've seen on a cog, incidentally).

Correct me if i'm wrong...
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Old 01-14-08, 01:20 PM   #4
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A 41/17 should be fairly easy. Definitely enough resistance to get into a rhythm, but without killing your legs.
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Old 01-14-08, 01:37 PM   #5
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Great. I suppose i'll start there and decrease a few teeth if necessary (or at least as i improve).

Thanks
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Old 01-14-08, 01:54 PM   #6
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I use rollers for all my riding in the winter, and I've found something like a 52 x 17, using a 700C x 25 tyre to be about right. That combination gives me a GI of around 80 which is comfortable; 20+ mph at a cadence of ~90; fast enough to be able to stay balanced on the rollers, and be able to practice "single leg" exercises or ride "no hands".

- Wil
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