Originally Posted by
Charles Ramsey
Shimano makes a 11 12 13 14 15 17 19 21 23 25 cog set. Both the 11 and 12 tooth cogs have serrations for the lock ring. I took this set removed the 11 tooth cog and put it on a freehub made for 7 cogs. The 25 tooth cog is offset from the carrier placing it 1.6 mm closer to the spokes. You will need to use a 1 mm spacer behind the 25 tooth cog placing it .6 mm closer to the spokes than a standard 7 cog set. This places the 12 tooth cog .8mm closer to the dropout. I used a truvative crank made for a 9 cog chain a 10 cog chain and the system worked. This setup lets you build a stronger wheel than a standard 10 cog cassette would allow.
Do some research on Mavic M10 cassettes. You can make all kinds of magic with them. Shimano 9, 10 or Campy 8, 9, 10 on a Shimano HG freehub. Completely customizable.