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Measure the diameter with an adjustable spanner if you don't have a vernier caliper, I think it would be more accurate than the circumference divided by pi.
The front and rear aren't interchangeable.
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It never got fast enough for me
Hunter S Thompson
R.I.P. Peter David Scott 18.07.59 to 21.11.16
Will be missed by us all but we will always remember you.
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