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replacing a bottom bracket

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replacing a bottom bracket

Old 03-15-09, 04:07 PM
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dave4687
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replacing a bottom bracket

So I picked up an old trek 400 elance cheap off craigslist the same as this model (http://www.vintage-trek.com/TrekBrochure1987.htm#page13). To make a long story short I wont have the bike for another month so I can't measure anything, but I wanted to have some new components ready to put on it when I get it. I bought a new shimano 175 mm 105 FC-5502 crankset compatible with V1 octalink bottom bracket. I will be running a 9 speed setup. I know the old trek has a square tapered bb, so I will have to replace it. I've never replaced a old style bb with the new cartridge style so I'm not sure what size I will need. Has anyone replaced a similar style bb before or have any advice?
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Old 03-15-09, 04:37 PM
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CACycling
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You'll need to install an Octalink BB to match the new cranks. It will be an easy swap.
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Old 03-15-09, 04:42 PM
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Just remove the old BB cups, bearings, and crank axle. Clean the threads. Grease the threads. Install the new cartridge BB.
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Old 03-15-09, 04:50 PM
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Thanks. But does anyone know what size bb I will need?
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Old 03-15-09, 05:45 PM
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Originally Posted by dave4687 View Post
Thanks. But does anyone know what size bb I will need?
68 X 109.5 for a double crankset, 68 X 118 for a triple.
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Old 03-15-09, 06:55 PM
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Originally Posted by Retro Grouch View Post
68 X 109.5 for a double crankset, 68 X 118 for a triple.
That's correct and your Trek will be English threaded (BS 1.37x24tpi). Remember the drive side cup is left-hand threaded!
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Old 03-15-09, 08:07 PM
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sweet thanks guys
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