Old 03-05-14, 02:28 AM
  #7  
WNG
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Join Date: Sep 2007
Location: Arrid Zone-a
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Nice new set of 1055 series hubs! They spin buttery smooth.

What you have there is Shimano's transitional freehub body. It has threads to be backwards compatible with Uniglide cassettes. But is splined and internally threaded for HG cassettes It is meant for 7 speed cassettes. The 6 speed Uniglide bodies are shorter. If you plan to run 6 speed, then a spacer is required.

You can install any STANDARD 7 speed HG cassette. That means no HG-C cassettes with the smaller 11t cog. Since you wish to use a 13t small cog, it's not an issue.
7 speed HG cassettes are still available, and I bet you can find one to suit your needs. Otherwise, you can stack your own combo. It's pretty simple to do, just grind the ends off the pins holding a cassette together.

You mentioned 8 speed cassettes...those require a freehub body which are 4.5mm longer. 8/9/10 speed fit one these bodies.
The 105SC did get one of these and went to 130mm for its last revision.
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