Bottom bracket Identification.

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05-15-17 | 12:55 PM

rgconner

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Bottom bracket Identification.

I have a 2000-2001 Campy Record bottom bracket, ISO square.

I believe it is English Thread, Italian thread seems to be an older standard that would not be used by 2000, but I am not 100% sure.

Any easy way to verify?

One thought is that English has reverse threads on one side, Italian should not, but not 100% sure on that.

05-15-17 | 01:10 PM

corrado33

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Quote:

Originally Posted by rgconner

Right side cup on an Italian will be right hand threaded. On English it'll be left hand threaded. You could also measure BB width.

68 = english, 70 = italian.

05-15-17 | 01:27 PM

rgconner

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Is the measurement possible without removing the BB?

Measure at the exposed cup?

05-15-17 | 01:38 PM

Bill Kapaun

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Quote:

Originally Posted by rgconner

Is the measurement possible without removing the BB?

Measure at the exposed cup?

Think of it as shell LENGTH.
https://sheldonbrown.com/harris/botto...ets.html#sizes

Last edited by Bill Kapaun; 05-15-17 at 01:41 PM.

05-15-17 | 01:50 PM

rgconner

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Quote:

Originally Posted by Bill Kapaun

Think of it as shell LENGTH.
Bicycle Bottom Bracket Parts from Harris Cyclery

So measure on the axis of the spinning axle?

Interesting... I would have thought it would have been at the threads like measuring an M5 bolt.

05-15-17 | 04:14 PM

gearbasher

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I don't think I've ever seen a Campy Record BB that didn't have the threading stamped/printed on the outside of one or both of the cups. You shouldn't have to remove or measure anything to find out if it's English or Italian. Spindle length is another story.

05-15-17 | 04:26 PM

corrado33

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Quote:

Originally Posted by rgconner

So measure on the axis of the spinning axle?

Interesting... I would have thought it would have been at the threads like measuring an M5 bolt.

Measure the bottom bracket SHELL. The thing that's attached to the frame and that the BB screws into. You can measure that with the BB still installed.

05-15-17 | 07:26 PM

Andrew R Stewart

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Quote:

Originally Posted by rgconner

So measure on the axis of the spinning axle?

Interesting... I would have thought it would have been at the threads like measuring an M5 bolt.

two different aspects being measured. Shell width has nothing to do with the threading (except for the now common partnering of certain thread dimensions with certain shell widths). Example is with mountain bikes (and a few road ones) English threaded shells/Bbs are made in 68mm and in 73mm wide widths. Just as your M5 bolt could be of different lengths too. Andy

05-16-17 | 11:01 AM

JohnDThompson

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Quote:

Originally Posted by gearbasher

I don't think I've ever seen a Campy Record BB that didn't have the threading stamped/printed on the outside of one or both of the cups.

+1 this. 1.370 x 24tpi is English thread; 36mm x 24tpi is Italian thread. By 2001 I think those were the only thread options offered.

N.B. Bottom bracket shell width is not a reliable indicator of bottom bracket thread spec. While most 68mm wide bottom brackets will be English thread, and most 70mm bottom brackets will be Italian thread, there are many exceptions. Look for the thread spec markings on the cups to be certain.

05-16-17 | 11:07 AM

#10

JohnDThompson

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Quote:

Originally Posted by Andrew R Stewart

Exactly. Italian track bikes used to commonly have 65mm wide Italian thread shells. I've seen British bikes with English thread shells ranging from 66mm wide to 72mm wide. And as noted, many mountain bikes have English thread 73mm wide shells. And some Japanese bike-boom era bikes had 70mm wide English thread shells.