Joined: Jan 2010
Posts: 9,814
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.
I suspect these are based on the same casing size as the 1-1/4 Pasela, which measures huge compared to other 1-1/4" tires.
The World Tour is of course similarly huge (though is heavy, sluggish and stiff at least compared to most skin-side tires).
I get good tread mileage from Panaracer tires of this type, Pasela et al.