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Singlespeed & Fixed Gear "I still feel that variable gears are only for people over forty-five. Isn't it better to triumph by the strength of your muscles than by the artifice of a derailer? We are getting soft...As for me, give me a fixed gear!"-- Henri Desgrange (31 January 1865 - 16 August 1940)

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Old 07-29-08, 10:46 PM   #1
skinnyboy
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moutain bike track frame crankset size inquiry

Do mountain track frames usually run 110mm bcd crankset, rather than 130mm bcd?
How big of a chainring I can use? Is it usually smaller for rear triangle clearance?
just curious. thanks.
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Old 07-30-08, 12:13 AM   #2
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Originally Posted by skinnyboy View Post
Do mountain track frames usually run 110mm bcd crankset, rather than 130mm bcd?
How big of a chainring I can use? Is it usually smaller for rear triangle clearance?
just curious. thanks.
MTBs use a few different BCDs. 104 is pretty popular.
They usually run a 42t large ring. you could probably go a little large though, on the outside.
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Old 07-30-08, 12:41 AM   #3
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actually does it really matter wheter it is 104 or 110 or 130? I think as long as there is clearance
between the chainring and the seatstay, it should be fine. That means the BB spindle length needs to
be longer to accomodate bigger ring.
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Old 07-30-08, 08:58 AM   #4
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Mountain track frame??
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Old 08-03-08, 04:02 PM   #5
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Originally Posted by FlatFender View Post
They usually run a 42t large ring.
44.

On a geared mtb (where a 44t ring would be run), the big ring is run on the outside space on the spider. This would not make for a good chainline, unless you were going to respace the axle or use a cassette wheel with spacers. A 44t (or larger) ring might fit in the middle position and allow a conventional chainline, but it would depend on the chainstays. A single-speed mtb would typically run a ratio near 2:1, generally 32/16. This allows them to climb big hills. Clearance isn't always planned in.

-Rob.

Last edited by robcycle; 08-03-08 at 04:08 PM.
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