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Join Date: Apr 2015
Location: Morris County, NJ
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Bikes: 90's Bianchi Premio, Raleigh-framed fixed gear, Trek 3500, Centurion hybrid, Dunelt 3-spd, Trek 800
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Does your BB have cups and loose ball bearings? If so, you may be able to replace only the spindle at very low cost. Disassemble the BB and measure the spindle, including the diameter and the distance between the forged "cones." Look up BB spindles or "BB axles" at Niagara or Bikewagon and ensure that they carry spindles with the same dimensions. You'll have a choice of lengths, but hold off till you have a JIS-taper crank. Then buy the spindle length recommended by the crank manufacturer. I've done this a couple of times.
In the past, there were some odd variations in JIS, but a new spindle and new crank should match up fine.