Shimano 600 8-speed hub question

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08-09-06 | 08:39 AM

explody pup

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Shimano 600 8-speed hub question

My current frame is spaced out at 126 mm in the rear. I read somewhere that the Shimano 600 8 speed hubs, which are spaced at 130 mm, have 4mm spacers on the axels. Remove one spacer and redish and you have a 126 mm spaced 8-speed rear hub. Can anyone here confirm if this is true or not?

Also, if true, what kind of problems would this pose for shifting? I can't really think of any.

I know I can just stretch the rear triangle, but I want to know what all my options are.

08-09-06 | 09:03 AM

Sheldon Brown

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From: Newtonville, Massachusetts

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Quote:

Originally Posted by explody pup

I don't believe that is true. If it was, it wouldn't cause shifting problems, but it would create a VERY weak and unreliable wheel due to the excessive dishing that would be required.

Re-spacing the frame is the correct way to do this. It's safe and easy with steel frames.

See: https://sheldonbrown.com/frame-spacing

Sheldon "Leverage And String" Brown

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08-09-06 | 10:57 AM

Gonzo Bob

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Joined: Oct 2003

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Bikes: Early 1980's Ishiwata 022 steel sport/touring, 1986 Vitus 979, 1988 DiamondBack Apex, 1997 Softride PowerWing 700, 2001 Trek OCLV 110

Looking at the exploded view of the current 6600 Ultegra hub https://bike.shimano.com/media/cyclin...9830538031.pdf there is a 4.8mm axle spacer on the left side. I don't know if all Ultegra/600 hubs have these. I had a 6400 rear hub that did, though, and I believe my current 6500 rear hub does, too.

I've done the opposite - spaced a 126mm rear hub out to 130mm by adding a 4mm spacer on the non-drive side to build a pair of sturdy road wheels for my MTB. But I don't know if I would trust a wheel with extra dish.