I have been working on a rigid Triumph from time to time. It has the fixings for rear set foot pegs, so I assumed that it was a “normal” T100c frame. But the frame has an extra or the brake fixing lug at an different position…..I have never seen that before. I have been looking at a bunch of photos and web sites without a result.
The lug are so close to the rear wheel adjusters that the stock adjuster bolt won`t go in. So I tried to enter the adjuster the wrong way but the hole is just ¼”. The normal size and the other side are 5/16”…
Some other frames to compere:
A triumph Grand Prix rear frame.
A standard Triumph Thunderbird rear frame:
If you can help me solve this mystery, leave a comment or mail me on