Right your 27"/630 are the largest except some odd old Raleigh 3 spd.
There are 650 b and c rims but strangely they are smaller.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk