I commute and sometimes do road rides (even slower than I normally go) on a cheap lil' 10 year old GT Outpost trail.

Steel frame and fork, no suspension, nothin' fancy, cheap cheap cheap bike. It had slicks from the start. Last year using a gift certificate from family for my 50th I got new wheels: Mavic Cross Ride.

Whoo hoo! They cost more than the bike itself but dayuhm I love this bike. I may even re-paint it I like it so much. Best upgrade ever.