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BB model verse length Shimano LP28

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BB model verse length Shimano LP28

Old 07-08-13, 04:39 PM
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DCwom
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BB model verse length Shimano LP28

I have a creaky bottom bracket, I know its a Shamano LP28 but I don't know the length, the BB has other numbers 68, BC 1.37x24. I have a picture of it when it when it was out of the bike for other reasons. I want to get a new bracket before I disassemble it, so I can't easily measure the length. I'm thinking of replacing it with a UN55, but I've got to know the length. Can anyone help decipher the length from the markings?

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Old 07-08-13, 05:02 PM
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Can't measure the length? Just put one end of the spindle against a wall, place a straight-edge on the face of the other end and measure the distance from wall to straightedge. Or if you have a large clamp similar to that below use it as a caliper.
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Old 07-08-13, 05:27 PM
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I bought a plastic vernier caliper at Harbor Freight for $0.99. For measurements as close as 1mm or 1/32 inch it has worked fine. It makes this kind of measurement a snap. I have the same BB.
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Old 07-08-13, 06:17 PM
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Originally Posted by cny-bikeman View Post
Can't measure the length? Just put one end of the spindle against a wall, place a straight-edge on the face of the other end and measure the distance from wall to straightedge. Or if you have a large clamp similar to that below use it as a caliper.
Maybe I should have mentioned that this is a tandem and its the stokers BB. I'm trying to avoid pulling both cranks and associated chain rings and chains that are on both sides of the BB.
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Old 07-08-13, 06:26 PM
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You can still do a similar procedure. Just back out the crank bolts far enough to project past the crank arm, take the measurements and then just subract distance from top of crank bolt to face of spindle end.
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There's no such thing as a routine repair.

Don't tell me what "should" be - either it is, it isn't, or do something about it.

If you think I'm being blunt take it as a compliment - if I thought you were too weak to handle the truth or a strong opinion I would not bother.

Please respect others by taking the time to post clearly so we can answer quickly. All lowercase and multiple typos makes for a hard read. Thanks!

Last edited by cny-bikeman; 07-08-13 at 06:40 PM.
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