Okay that's an indexed shifter.No idea. Bog std Shimano Gripshift things.
As you say, a simple swap of my existing cogs to the new hub. And all that's needed to do this is a chain whip? I'm not a big fan of buying tools I'll likely never (or seldom) need again. Can the swap be accomplished with a section of old chain? My existing chain is probably on its last legs so would make sense to renew that at the same time. I know I'd need a chain breaker.
so it's really a case of built-in obsolescence?7 Speed cassettes are mostly obsolete but there are still some around as new old stock.
http://www.chainreactioncycles.com/Models.aspx?ModelID=38302. Also some very low end Shimano like the HG30 cassette is still 7 speed.
If you get an 8-speed cassette you will need a new shifter and a new chain as well since the spacing between the cogs is different for 7 vs 8. It's not just a matter of not being able to use one of the 8 gears. The indexing will be off so it will run roughly and noisily.
At my level, seems pretty pointless. Ended up with an AT4500 32h laced 4x. Seller says the hub accepts 8/9/10 speed sets.
Should be okay for my careless riding, I suppose.