My husband just bought a Trek 420. By the serial number it should be an '84 but the color (silvery gray with red lettering) seems consistent with an '85. Anyway, my question has to do with the rear hub. Before buying the bike I read just enough about the Helicomatic hub to know that it is problematic and that parts are hard to come by. The wheel does not spin nice and freely. Clearly the hub needs servicing.
Is this something I can do myself? I assume the cassette needs a special tool to remove it. Can I lube the bearings from one side and skip removing the cassette? Should I? The chain has some wear so the cassette likely does as well.
Or, should I just replace the wheel? The wheels look to be 700s not a 27 inch.