Thread: Sugino AT and MT68 spindle problems
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Old 08-27-21, 11:12 PM
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cjenrick
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Spindle matchup is a nightmare, I feel your pain!

The 1984 Specialized Stumpjumper used the Sugino AT crank set along with a Specialized "Sealed" bottom bracket.
The Specialized bottom bracket was probably made by Suntour/SR. I do not believe that Specialized put their name on their bottom brackets for very long.

So you need that square taper that some say is a bit different from Campagnolo, ie: specific only to Suntour.
If you measure a bunch of Suntour spindles you will find that there are some slight differences in the taper due to machine shop tolerances.

Their is a set of Specilized cups and bearings for sale on evilbay right now. It is a good setup. I do not believe i ever had to repack the bottom bracket on my 1984 Stumpjumper, even after 30 years of constant torture.

The 84 Stumpy with the 68 mm shell appears to have used a 130 mm spindle according to this Specialized BB doc.
Hope this helps.
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