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Need new bottom bracket. Confused...

Old 05-15-07, 08:07 PM
  #1  
xkwox
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Need new bottom bracket. Confused...

I have what is written on it. But can not find anything with similar numbers...

I dont want the same one, i want the same size one, but want a good one. I found this one online for 11 dollars..
This is what is engraved on it in the order it is written..


BB-CT92
Shimano
VIA 73 XA
BC1.37x24
ZL 121


I need to know what size this is in today's terms? All i find is mmxmm
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Old 05-15-07, 08:15 PM
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I'm guessing it is a 73 mm shell with a 121 mm spindle length. But why guess? Get out your ruler and measure the spindle length and the shell of your frame. Then all you need to know is the interface type.
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Old 05-15-07, 08:19 PM
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Old 05-15-07, 08:23 PM
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Old 05-15-07, 08:23 PM
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Originally Posted by Portis
I'm guessing it is a 73 mm shell with a 121 mm spindle length. But why guess? Get out your ruler and measure the spindle length and the shell of your frame. Then all you need to know is the interface type.
i dont know what either of those are
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Old 05-15-07, 08:26 PM
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Spindle length 121mm
Chain line 50mm
Thread dimensions BC1.37x24TPI(73mm)
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Old 05-15-07, 08:49 PM
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Originally Posted by xkwox
Spindle length 121mm
Chain line 50mm
Thread dimensions BC1.37x24TPI(73mm)
thats all ya need, well, and the interface (square taper, ISIS, octalink...etc.)
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Old 05-15-07, 08:57 PM
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Not to many highend choices unless you find some NOS RaceFace or similar.

Best bet is Shimano UN53 or 54. You might even find UN73(lighter, hollow spindle) The Shimano will be listed as 73x122

You can go into a bikeshop and if they buy from Quality Bicycle Parts ask for a CR5375 (UN54 73x122 square taper)
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Old 05-15-07, 09:55 PM
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Originally Posted by Rev.Chuck
Not to many highend choices unless you find some NOS RaceFace or similar.

Best bet is Shimano UN53 or 54. You might even find UN73(lighter, hollow spindle) The Shimano will be listed as 73x122

You can go into a bikeshop and if they buy from Quality Bicycle Parts ask for a CR5375 (UN54 73x122 square taper)
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Old 05-15-07, 11:53 PM
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Some spindles are offset to the right. This should be measured with the BB in the bike.The spindles on my bike were symmetrical, but the way the BB was set in the frame, it was 1mm to the right. This was easy to duplicate with a Phil Wood BB. Phil's stuff is real nice. bk
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