Converting cassette into single-speed

youl need two cassetes to have enough spacers.

ive done a couple of these conversions and ive found that the ramped tooths on cassette sprockets somtimes work fine, othertimes they derail the chain very easily while under heavy load. its a bit hit and miss. i think guesset sprockets run at about £5 so it might be easier to just get one of those if your short on moneys.

Gusset sprockets are shite ... don't skimp and get yourself some decent sprockets from on-one or surly, they will last forever and there is no chain skip at all. Used to have skips all the time until I replaced with a decent sprocket (my chain tension is bang on).