steel pulleys vs aluminum

Aluminum ones are lighter. They will have less rotational mass than the heavier steel ones, which can only help with underdriving the accessories.

I'd say aluminum if you have the extra 30 or 40 bucks
 
wazazzle said:
good topic, was wondering the same thing. i heard that aluminum pullies warp, unlike steel. less density=less strengh???

Crappy pullies will warp, either steel or alumimum. I haven't scene a single tread on stangnet about a warped pulley unless something else went wrong first.