Freehub or Freewheel?

[michael franks]

The freehub/wheel in the pic looks as though it's some kind of hybrid. The socket which takes the removal tool is not the normal Shimano size (but one I use for Campag fits) and the sprockets are Shimano. Apart from the removal socket there also appears to be a lockring but I've no idea what removal tool to use. I haven't seen this type before. Any ideas much appreciated.

 

[Midlife]

I think Sheldon describes then in this article?

https://www.sheldonbrown.com/mega7/

 

[FluffyChicken]

MF-TZ20 will get you instructions and the tool for removal but not the tool to fit the outer ring

 

[drystonepaul]

It's a Shimano freewheel. The tool you need has different splines to Shimano cassette lockrings used on Shimano freehub bodies.

TL-FW30 freewheel tool is the correct Shimano tool for the job, but there are plenty of aftermarket alternatives.

A bench vice and the right technique is also very handy as freewheels are usually very tight to remove.

 

[michael franks]

Thanks to all for your replies which as usual are very helpful.
It seems that this particular cassette is a cross between the MF-TZ20 and the MF-TZ500 the former being 7 speed and the latter 8 speed. As such it's probably extremely rare and I should put it on ebay for a £1000 BIN price.