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Old 05-23-08, 07:10 PM   #1
slowjoe66
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Need new cranks...advice please?

Hi everyone. I'm a bit of a dope on mechanics outside of the very basics. Essentially I am upgrading a hybrid bike (GT Nomad) with better components as I wear them out. I've got about 2200 miles on the old girl and it's time for a new crank and chainrings. The ones on there that came with the bike are cheapo pressed deals. I want to get some better ones. The bike is a 21 speed. About 3 years old.Here are my questions:

I would like to put on a MTB crankset for the lower gearing. Currently I think it's configured as a road triple. Will there be any issues with going MTB crankset?

Will I need a BB that matches up with the new crankset? Or are they sort of standard.

When I look at cranksets on the net, they say: 9 speed (for example). How will this work (or will it) with my 7x3 setup?

Thanks.
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Old 05-23-08, 07:58 PM   #2
BCRider
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Assuming your present setup has a square taper and that you get a square taper crankset then it should work just fine. You MAY need a different bottom bracket if the shaft length is not correct. Some checking to find out what the right BB length for the cranks you want will soon tell you if you need one or not.

Outside of the real cheapies the are all 9 speed sets these days. They will work OK with your 7 speed setup.
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Old 05-24-08, 07:19 PM   #3
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Thank you.
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Old 05-25-08, 12:01 PM   #4
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if i were you id make the ultimate upgrade and get a crankset that uses external bb's. i made the switch about a year or two ago, and now even my fixie has an external bb crankset- the first one ive ever seen- they work soooo much better and last a lot longer
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