At ~£2.50 each it's still not a bad price..
Are http://www.bearingboys.co.uk/BZMM80W...e_Wheel-8714-p the high grip black ones you were talking about? According to the data sheets for these wheels(http://www.bilcastors.co.uk/images/c...ls-Cat-Ed4.pdf) the blue ones have the softer tread so should in theory have the better grip and wear the fastest... ?
Bearingboys didn't actually do a small enough version of the blue wheels, but I found an 80mm version sold here: http://www.bilcastors.co.uk/bzmh80wrn-p-1286.html. They're a bit wide, but could be machined down a bit to fit I think...
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