Can I replace a Shimano MF-Z012 (freewheel) with a MF-TZ510? Can I replace a (6-speed) Shimano MF-Z012 with a (6-speed) MF-TZ500 or MF-TZ510 freewheel?
Bonus question: apart from the &quot;T&quot; both models seem to belong to a related series. What does the &quot;T&quot; mean?
Both of these models are freewheels not cassettes. They are for the most part interchangeable. The only area of concern would be the size of the largest cog. Too large a difference from you original model may necessitate a longer or shorter chain. You may also need to make some small adjustments get the shifting optimized.