The Triumph C Range
The main frame is made from 1 3/8 OD 12 gauge tubing, duplex frame tubes for supporting the engine are 7/8 14 gauge, while the sub frame is a combination of 1 inch 15 gauge tubing for the uprights and 7/8 14 gauge for the seat support base. The headset and engine bridge support are malleable-iron castings.
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