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Yes the hubs are the same. rotors are different. The Heritage specials have 64 spoke holes though.
You can use the '75 hub but not the '75 disc. The '75 disc has a different offset. You will have to use the '75 hub with your '81 disc and '81 caliper. The '75 caliper will not fit.
Check the backside of the disc mounting holes on the '75 hub. On some early hubs, these were blind holes (didn't go all the way through). Check the length of the disc mounting bolts. Run them in finger tight to make sure they go in tight enough before bottoming out. If the bolts are too long, they can break the back out of the hub when fully tightened.
Check the backside of the disc mounting holes on the '75 hub. On some early hubs, these were blind holes (didn't go all the way through). Check the length of the disc mounting bolts. Run them in finger tight to make sure they go in tight enough before bottoming out. If the bolts are too long, they can break the back out of the hub when fully tightened.
Okay...thanks to everyone who responded. So much knowledge and info on this site and I sure appreciate it.
Wish I could find a couple of '81H hubs to replace with instead of robbing from the other one. Maybe I will keep looking...
flyboy
Wish I could find a couple of '81H hubs to replace with instead of robbing from the other one. Maybe I will keep looking...
flyboy
