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Old 06-16-12, 08:23 AM   #1
jdmz
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1997 Trek 1220 bottom bracket

I think my bottom bracket is broken. The crank-set wobbles when I try to push it laterally. From what I understand, the bottom bracket is a Shimano BB-LP26, 118 mm spindle BB Shell Width 68mm English. I searched this up and cannot find a replacement. Also, does anyone know the torque specs for the bottom bracket screws and crank screw? What kind of taper is the Shimano BB-LP26 using?
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Old 06-16-12, 09:56 AM   #2
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I think my bottom bracket is broken. The crank-set wobbles when I try to push it laterally. From what I understand, the bottom bracket is a Shimano BB-LP26, 118 mm spindle BB Shell Width 68mm English. I searched this up and cannot find a replacement. Also, does anyone know the torque specs for the bottom bracket screws and crank screw? What kind of taper is the Shimano BB-LP26 using?
Will this work? http://www.amazon.com/Shimano-Square...ywords=bb-un55
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Old 06-16-12, 10:28 AM   #3
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All Shimano bottom brackets use the JIS taper (as far as I know). If you're using a cartridge bottom bracket and it's definitely the spindle wobbling in the bearings, it's worn out or broken.
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Old 06-16-12, 11:53 AM   #4
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That'll work. The UN-55 is just a higher grade part.
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Old 06-16-12, 02:13 PM   #5
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UN26 comes in a 117.5, I use them all of the time. I typically buy mine from Jensen, $50 minimum order for free shipping. They will match other prices on the web, so I usually do not have a problem coming up with $50 order.
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Old 06-16-12, 04:42 PM   #6
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http://www.biketoolsetc.com/index.cg...TH-7420AL68118
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Old 06-17-12, 01:39 AM   #7
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If you're sure it's the BB, then the UN25 or UN55 should both work fine if you get the correct spindle length. Typically torque specs are printed on a sheet of instructions that comes with the BB unit and some BBs have a sticker with the specs on the BB-shell. But torque usually varies between 30 - 40 ft-lbs on the fixed cup, and 25 - 35 ft-lbs for the adjustable (or non-fixed cup).
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Old 06-17-12, 10:28 AM   #8
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I was looking at the UN26 too... But it only came in 68x117.5mm.... Do you think it will still work despite being .5mm shorter?

I've already ordered the UN55 for $19 shipped at amazon... Seems like a good price compared to my lbs.
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Old 06-17-12, 10:33 AM   #9
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I was looking at the UN26 too... But it only came in 68x117.5mm.... Do you think it will still work despite being .5mm shorter?

I've already ordered the UN55 for $19 shipped at amazon... Seems like a good price compared to my lbs.
Just to add a visual to this, .5mm is about the thickness of a fingernail. There is much more clearance than that between the cranks and the chainstays.

You'll be fine.
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