This started from my 17mm speedo drive failing and not being able to find a replacement. But 20mm speedo drives are still plentiful. This is an easy swap once you have the parts, and no machining is required. I did this swap on my 1992 900SS
Parts needed:
20mm axle
20mm wheel bearings
20mm fork insert
20mm inner hub spacer
20mm speedo drive
the washer that goes between the hub and the 20mm speedo drive
All these parts are a direct swap with the original 17mm hardware.
Unfortunately I don't know what year Ducati went from 17mm to 20mm axles, but I asked Ed from ducpower.com for the 20mm axle hardware and that's what he sent me. For new bearings I bought Timken 6204-2RSC3 from amazon, which are identical to the OEM 20mm bearings.
Parts needed:
20mm axle
20mm wheel bearings
20mm fork insert
20mm inner hub spacer
20mm speedo drive
the washer that goes between the hub and the 20mm speedo drive
All these parts are a direct swap with the original 17mm hardware.
Unfortunately I don't know what year Ducati went from 17mm to 20mm axles, but I asked Ed from ducpower.com for the 20mm axle hardware and that's what he sent me. For new bearings I bought Timken 6204-2RSC3 from amazon, which are identical to the OEM 20mm bearings.