Joined: Jan 2010
Posts: 9,818
Likes: 1,790
From: Northern California
Bikes: Cheltenham-Pedersen racer, Boulder F/S Paris-Roubaix, Varsity racer, '52 Christophe, '62 Continental, '92 Merckx, '75 Limongi, '76 Presto, '72 Gitane SC, '71 Schwinn SS, etc.
Not so fast, do you need 21.1mm or 22.2mm or 22.0mm (old French standard)?
The fit needs to be very accurate to be reliable.
True 7/8" is closest to 22.2mm, using conversion factors.