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Drilling a crank that old is not a great idea. They weren't that strong to begin with and 40+ years of use hasn't made then any stronger. I would not do anything to further weaken them. To be honest, if the pedals are frozen I'd think twice about using that crank. Aluminum corrosion expands and can create stress that crack the material ( similar to the way ...


0

Tap another 5 holes is not enough. There needs to be metal to space it out that I suspect is not there. Just add a spacer would probably not handle the load. Even if you do attach are you sure there is room on the bike? Are sure you can find triple front derailleur for that bike? If you get past all that you may end up with chain line issues. ...



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