I'm getting ready to buy a bike this afternoon, and the guy is offering it to me with SPDs on it. THe shoes that I am wearing now have Time cleats on them. I've never ridden SPDs, or even looked closely at them. Will I be able to (safely) ride this bike home 10 miles?
Your time cleats won't fit in the SPD pedals. Your shoes likely fit SPD cleats though. Ask the guy to give you a pair of SPD cleats so you can get home. If not, hopefully you can hit a store on the way and pick up a pair of SPD cleats. Apparently they are not all entirely compatible between different brands (based on another thread about cleat compatibility). Some work together better than others.
I don't think it would be very comfortable at all with Time cleats on SPD pedals. I'm thinking you'll have alot of foot slips.