Got my 'revised spacer' kit from ducati. 2 thin rings that go under the bearings before you put them in the ub (13 quid......each...) plus a new lengthened spacer that fit in the hub between the bearings (25 quid......). Poxy bearings only cost a fiver each. So ducati ebaring upgrade costs 61 quid !! Must be the most expensive bearings on the planet. The advice is to note the number on the original bearings and just pop down to your local bearing dealer. The only reason i can think of why they have changed the bearing type is that the new bearings are standard fitment in more models than the original 851 ones.
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