Originally Posted by
HillRider
The OP wouldn't have to replace the entire front derailleur, he would just have to buy an adapter clamp of the correct diameter. Shimano has adapters in 1-1/8" (28.6mm), 1-1/4" (31.8mm) and 1-3/8" (34.9mm aka 35mm). That would work if the seat tube is round and of a common diameter.
Understand. But if I recall correctly, Shimano band clamp adapters for braze-on FDs are in the same ballpark cost-wise as a replacement Giant OCR FD mounting plate.
If it turns out the mounting screw holes are stripped or that the bosses are loose, then that's a different story entirely. Then the clamp solution makes sense.
But if the FD hanger is cracked and causing the problem, why not just fix that rather than using a work-around that is visually obvious?