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17,98mm on my calipers for the bearing surface
which makes me think they are the 18mm variety and wonder why they label different bearings with the same code
£9ea though which would make me doing it worthwhile, just.
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I just replaced bearings on a fulcrum front wheel last week so can confirm that's the right bearing. I got them from here for slightly cheaper, but not much https://www.wychbearings.co.uk/MR-18307-LLB-ABEC5-Enduro.html
What diameter is the axle/nut surface that makes contact with the inner race?
Service doesn’t usually include cost of parts.