Bicycle Mechanics - Chainring question?
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12-04-05, 08:44 PM
I have a recumbent with a 110/74 BCD crankset. The chainrings are 46/36/24. I tour and tow a Nomad trailer with it and wonder if there is any way to lower the 24 to a 22 on this crankset. If not I will purchase a mountain crankset but I like the current crankset that is on the bent. Thank you in advance. Rich
12-04-05, 08:50 PM
I think you should be able to get a 22 for the 74 bcd (although i'm not absolutely sure without checking supplier catalogs). What about getting a cassette with a lower gear - what cassette gearing do you have?
According to Sheldon/Harris Cyclery's chainring page, 24 is as low as you can go. http://sheldonbrown.com/harris/chainrings.html
Don't know if there are any exceptions to this, but it looks like you'll have to get a mountain crankset in order to go lower.
EDIT: Don't forget to check thoroughly, first! I don't know if 24 is listed as smallest because of a physical size limitation, or just a matter of supply and demand.
12-04-05, 09:00 PM
24T is a small as you can fit on a 74 mm bolt circle crank. If you want a 20T or 22T you have to go to a MTB crank.
BTW, what is your cassette range? Can you go lower there which would be a lot cheaper then a new crank?
12-04-05, 09:25 PM
I have an 11-34 cassette so I can't go any lower there. I guess the Mountain crank is the way I will go. Thanks
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