21mm lug to lug. Rubber strap. Squash a 22 or 20 and a gap?
Buying a 21mm not an option? Hirsch do a fair few in 21...
EDIT: At least they did, that section of their web site is empty now. Lame.
@Stonehedge started
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21mm lug to lug. Rubber strap. Squash a 22 or 20 and a gap?