Cassette hub suggestions.

[mtbk]

Hi. I'm wanting to upgrade a Mountain bike from freewheel hub to a cassette hub.

I want it to be Shimano. HG fitting. to fit a 7-speed cassette. I will use a solid through axle but can convert a quick release hub. The hub axel can be 10mm or 12mm.

I need to find a popular model. A mainstream model currently the most popular model that sells a lot. So that it...
...is low and well priced brand new.
...has many new spares being sold.
...has models being sold second hand.
...has spares being sold second hand.

So my question is...
Can anyone with current experience in the bike world at this moment in time suggest such a model?

Replies appreciated.
Thanks.

 

[mtbk]

Hi. I have drawn an arrow on the attached picture below pointing to the part in question.

The part that locks together with the freehub cassette body to the spokes wheel hub.

My question is...
Is this part moulded with/into the centre hub. Or is it welded/fused on afterwards. Or maybe it is threaded on.

There is no mention on diagrams as to whether it is a removable part or non-removable part of the centre hub.

Maybe someone with experience of Shimano cassette hubs can answer this question.

Replies appreciated.
Thanks.