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Bottom Bracket for Specialized Allez(4 posts)

Bottom Bracket for Specialized Allezmbdavis
Nov 29, 2001 6:53 AM
I have a 1990 specialized Allez A1 (lowest end) that I'd like to replace the bottom bracket on. I'd like to put an Ultegra bracket in. Problem is that I don't know the size or thread of the bracket to buy... Specialized apparently doesn't return email. can any one help with guidance?


re: Bottom Bracket for Specialized AllezTJeanloz
Nov 29, 2001 8:31 AM
It's an English bottom bracket, length dependent on double or triple crank; 109.5mm for a double, 118mm for a triple.
CarefulDave Hickey
Nov 29, 2001 8:52 AM
You are going to replace the bottom bracket but not the cranks? The current generation Ultegra BB won't work. If you are using an older Ultegra/600 BB that has a tapered spindle, it will work. You will be a 109 or 118 depending on a double or a triple crankset. Your threads are english
re: Holy cow.....Rusty Coggs
Nov 29, 2001 6:09 PM
I make the assumption you have an original 1990 crank and original type BB...right?? then what you need is an 'ultegra' un-72 bb with tapered spindle. your threads are english. Measure the spindle length of the BB you have,end of taper to end of taper in mm. Now order a un-72 in size 68X spindle length in mm. Depending on the length of your present spindle, you may not find an exact length match.Ususlly a few mm either way makes no difference, but check your chainstay clearance with present setup to make sure a slightly shorter one would cause no chainstay interference.If you can't find an appropriate length in a un-72, the un-52 is almost as good,but a bit heavier due to the solid spindle,but may offer other length options. The current 9 speed splined spindle BB are NOT compatible with your crank.