I have a set of Hutchinson RT1 carbon tubeless wheels (mfg by Corima) with a shimano 10 speed cassette body.
I converted to 11speed Di2 & still want to use these wheels. I contacted Corima & they don’t offer an 11 speed cassette body for these hubs.
With access to a machine shop I was able to convert them, here’s how
Notes of interest……….
10 speed cassette body has a taller (deeper) spline on the inner 8 cogs.
The 11 speed cassette has uniform (short) splines & only fits over the shorter splines. It physically would not fit regardless of the width of the addition of the 11th cog.
The first step was to even out the splines on the cassette body. Since it’s aluminum it’s fairly straight forward to turn it on a lathe. Now the 11 speed cogs fit all the way onto the cassette body.
Next I measured the distance from the cassette lock ring to the axle lock nut to gauge the distance needed to clear the dropout. I used a Shimano WH-9000 C24 TL to gauge all the necessary measurements
Here’s the tricky part...... once done the cassette is no longer compatible with any other wheel set.
I machined the flange on the cassette spider of the last (biggest) cog to sit further on to the cassette body. This allows all 11 cogs to fit.
There was ample clearance with the spokes & no interference with the hub. I can’t say if this will work on all hubs out there.
I now have an 11 speed carbon tubeless wheel set.
I can swap between wheels & (other than brake pad change) it doesn’t require any derailleur adjustment.