Hadn't looked at this for yonks. the pics of your wheels (nice...) brought back memories. Years back I got asked to participate in an evening for the BEARS club guys. Idea was to bring them up to date with new rules for scrutineering purposes. A couple of the example bikes there had impulse wheels fitted. Well, they were easily available 17's...and cheap.
I pointed out that they had wheel bearings on close centers - which on heavy bikes meant they cut out quite quickly.
One of the bikes there was already a fail with discernable play. An eye opener for some of them.
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