Classic & Vintage - Which cassette for a Zeus hub?

I recently acquired a Modelo 3000 Benotto. I won't go into details about the bike, but I do need to know what kind of cassette I need. There is a six speed cassette on there now, which really needs to be replaced, and the hub is a Zeus. Let me know what you know. Thanks!

are you sure it isn't a freewheel?

It is a freewheel not cassette. How do you know it needs to be replaced? Is it seized? Does it shift sloppily. A Regina freewheel would probably be best for classic purposes but consider the newer Shimano 6speed freewheels with the 34 tooth bailout gear. You might need to change derailleurs but it will let you climb.

Also, make sure that the Zeus isn't a French threaded hub...probably not considering it's a 6-speed, but Zeus was typically FR thread and may have been slow to switch over. There should be a marking on the FW body or maybe even the hub shell, if it's FR.

It is a freewheel not cassette. How do you know it needs to be replaced? Is it seized? Does it shift sloppily. A Regina freewheel would probably be best for classic purposes but consider the newer Shimano 6speed freewheels with the 34 tooth bailout gear. You might need to change derailleurs but it will let you climb.

Yes, it's a freewheel! I was mistaken. The teeth are really out of shape, some are somewhat bent, and the shifting isn't very smooth. Thanks for the advice.

So would a Regina freewheel with an ISO threading work? The freewheel that is on my hub now is a Shimano. Just making sure!

Also, make sure that the Zeus isn't a French threaded hub...probably not considering it's a 6-speed, but Zeus was typically FR thread and may have been slow to switch over. There should be a marking on the FW body or maybe even the hub shell, if it's FR.

Zeus made both 5 and 6 speed freewheels. Their alloy-cogged units were among the lightest freewheels available in the mid-80s, and are highly sought after by collectors today. While Zeus manufactured primarily French (metric) hubs, freewheels, bottom brackets and headsets they also supplied all of their components in Italian thread.

Also, make sure that the Zeus isn't a French threaded hub...probably not considering it's a 6-speed, but Zeus was typically FR thread and may have been slow to switch over. There should be a marking on the FW body or maybe even the hub shell, if it's FR.

Zeus used French threads on their own bikes, but also made their components in English (and possibly Italian) threaded versions. There are markings that show the standard, but I can't recall what it is for hubs.

Zeus freewheels were stamped with a B on the back, if they had English threads. An M stamp denoted French threads. Zeus hubs with English threads were stamped BSC on the center section, while French threaded hubs were not stamped. I'm not aware of Zeus issuing hubs or freewheels with Italian threading.