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Frame tube size.

JBW5

CB750 Member
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Hot Springs Arkansas
I'm away from my bike at the moment but would like to pick up some tube to bend my rear seat hoop. If i recall, my 78 cb has 1 1/8' OD. Can anyone confirm this? Does anyone know the ID on the frame? thanks
 
well I just measured a 78 k model at the seat mount in back behind the shock welds and I got 15/16 in and just under that on a 74 same place
 
My '75 has 1" tubing for the seat rails and 1-1/8" for the lower rails to the seat rails. I'd use 11ga (.120" wall).
 
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