Freewheel or cassette bike gears

Jem8472

I am looking to try and change my rear gears on my bike as they are worn.

I have the model number of the gears Shimano: MFTZ07

I have had a look on e-bay and it looks like they are a freewheel rather than a cassette. But does anyone know how I can check before ordering the stuff as I will also need a tool to remove the freewheel.

The gear on my bike looks like this:
http://www.ebay.co.uk/itm/BRAND-NEW-Shimano-Bike-Bicycle-7-Speed-Freewheel-TZ07-/170683363825?pt=UK_sportsleisure_cycling_bikeparts_SR&hash=item27bd8571f1#ht_1974wt_1037

As far as I have read a cassette would have a locking ring at the top level with the gears.
So any help guys?

Thanks.

Mankysteve

http://www.youtube.com/watch?v=WTfs3gEhgKo

You need a tool with spines on.

matty538

Thats definitely a freewheel not just the cassette, so your very limited with choice for starters. Though Iv never had one on any of my bikes, you need the park fr1 tool (other makes available). Theres plenty on ebay, 330598412612 to get you started

ventureuk

Doing it at home unless you are a regular cyclist who maintains there own bikes is not really worth it.

Mankysteve is correct, you need a specific tool to remove the cassette but also you will need a new chain. The cassette and chain wear together at the same rate and fitting a new cassette without a chain means the chain will 'skip' when you are cycling, very annoying and potentially unsafe.

Take it to a local bike shop, the parts will cost very little and no more than an hours work is involved.

If you really want to diy then have a watch of the videos here, one of the best instruction guides anywhere.

http://bicycletutor.com/