Thanks. I'm sure they're both English threads. Both made by American companies. The chainrings on the old bike are 48-39 and I'm guessing 30. The newer Bontrager crank is 50-39-30. So sounds close enough. The shifters are actually Shimano, so I don't know what's up with the Suntour RD, but I'm going to give it a whirl and see how it works. I have that chain that was on the Trek. It has less than 300 miles on it, so I'm guessing that's good to go as well.