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Old 11-04-09, 10:34 AM   #1
osiris419
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bottom bracket size on an 84 Ross Gran Tour II

Hey. I'm in the process of converting an 84 Ross Gran Tour II into a fixed gear. This is my first build. I got the frame bare (and free) so there is no older parts to compare but I need to know what size the BB is. I know I need it to be 107mm in length but what I don't know is the thread size. I went to Sheldon Brown and I think I need a 63mm but I'm not sure. Any help would be great.
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Steve
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Old 11-09-09, 12:57 PM   #2
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Try measuring it. I guarantee it's not 63mm.

Ross was made here in the states so it's most likely English. If you can lay hands on a standard BB, try screwing it in. If it goes you've found what you need to know.

Alex Ross, grandson of the founder, occasionally posts on the Classic forum.
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Old 11-09-09, 01:28 PM   #3
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Sure it's 107 length ? OK I suppose. It IS English in any case, even if it was a slightly later Asian built. A VERY slight chance of 73. Odds are overwhelmingly.. 68mm.
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Old 11-09-09, 03:50 PM   #4
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ok thanks I'll figure it out.
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