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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 10-04-06, 12:29 PM   #1
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90's Ritchey Logic Road Double (square taper); Bottom Bracket size???

Anyone know the specs of the bottom bracket spindle length for the old Ritchey Logic road double (manufactured by Sugino in the 90's; 110 bcd)???
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Old 10-04-06, 12:46 PM   #2
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It's not in Sheldon Brown's database...
but you can figure it out if you've got a square-taper BB of known dimensions, and a ruler. It just takes time and measuring effort. (Assuming you've got the crank to begin with).

First, I'm sure it's a JIS taper (used by everybody except Campy and a few companies in Campy's orbit, e.g. Stronglight).

Second: mount the BB in the frame (assuming 68mm English BB shell) and mount the drive-side crank on the drive-side of the BB. Tighten the fixing bolt down hard. Now you need to measure the chainline. Road chainline should be 43.5mm from the centerline of the bike's tubes to the centerline of the two chainrings (so in between the chainrings).
You also need to pay attention to whether or not the cranks take a symmetrical BB spindle.
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