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Want to upgrade crank and bottom bracket

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Want to upgrade crank and bottom bracket

Old 03-17-08, 05:43 PM
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Argus
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Want to upgrade crank and bottom bracket

I need to change my crank, currently I running and old Altus. When I replaced the chain I noticed chain ring had some play in it. At the same time I would like to switch over to a seal bottom bracket. Is there anything I need to be aware of ie, chain ring alignment.

TKS
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Old 03-17-08, 05:45 PM
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The bottom bracket you need will be defined by the crank you choose.
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Old 03-17-08, 06:08 PM
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Shimano Altus comes with the Square Taper bottom bracket UN26.
It's a sealed cartridge bb. You can change it to another Square Taper bb that has the same length, for example, 68x113.

Cheap cranksets can wobble a little bit. You can correct them if you take out the chainrings and then bend the crankset arms using a crescent wrench. You can move the derailler closer to the crank arms to serve as an indicator.
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Old 03-17-08, 07:18 PM
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Was the play in the chainrings, crank or bottom bracket? If it was really in the chainrings, the problem may be as simple as the bolts being loose. Edit: sounds like Barabaika is referring to out-of-true rings, whereas I am talking about loose rings. Play can also come from a traditional cup and race bottom bracket that has a loose left cup.
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Old 03-18-08, 05:16 AM
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Originally Posted by JiveTurkey View Post
Was the play in the chainrings, crank or bottom bracket? If it was really in the chainrings, the problem may be as simple as the bolts being loose. Edit: sounds like Barabaika is referring to out-of-true rings, whereas I am talking about loose rings. Play can also come from a traditional cup and race bottom bracket that has a loose left cup.
It is the chain ring, and the ring are riveted not bolted. If I take the right crank arm off I can hold onto the peddle arm and slightly rotate the chain rings. Also this is an older altus about 10 years old.
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