I need to upgrade a Shimano Bottom Bracket, what matches?
I have a Shimano Bottom bracket thats taken a crap. Need to upgrade. This bike is going to take a LOT of abuse. I would like to know which models are superior and will still fit the shell.
Original model number: Shimano BB-LP27
Shell width = 68mm
Axle length = 110 mm (though my eye says 112, could be a crappy ruler)
spindles = square taper, with a hole bored in the center to allow bolt for mounting cranks.
english threading
What matches? Please be specific, I need the correct model numbers and brands to order.
JB
The UN54 is Shimano's best current replacement for sealed, square taper bottom brackets. It would be an upgrade over the cheaper LP27 you were riding. The UN54 is a good, reliable BB for not much money, though some people aren't nuts about the plastic adjustable cup.
IRD offers their QB55 and QB75 as a suitable upgrade. The QB55 is barely more $ than the UN54. The QB75 is a bit lighter and costs $40+. Sugino offers a similar product, too.
Any of the above would be better than what you had.
Top upgrades would be from Phil Wood and White Industries. Over $100.
Besides getting the correct width (68mm) and spindle length (110mm), make sure your replacement has the correct taper. For most bikes today, this would be JIS. Some euro bikes may have ISO taper.
Chicago
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