I have a set of Deore DX wheels with 7spd cassette and appropriate free-hub body. Can I change the free-hub body to one that will accept an 8spd cassette?
Unfortunately it doesn't sound like a 'budget' option then :? .... I had hoped to sell the 7spd thumbies and replace with 'cheapo' 8spd GS; hence the need for the 8spd cassette.
A neat solution is to use an '8 from 9' setup. The first 8 cogs of a 9 speed fit exactly onto a 7 speed cassette. Buy a low-end 9 speed cassette, dismantle and discard the largest sprocket. Fit the rest to the hub and run with 9 speed shifter and chain.