Weather willing, April's the month Hot Skates takes to the streets with its rentable four-wheelers. Beware Superman because the rollers on these skates are Kryptonic. They're made of high-rebound, space-age polymers that go indoors, outdoors...over curbs, concrete or carpet. Zoooom.

Hot Skates vans will be open for business at two locations this season: at 19th and M streets between 6 p.m. and 2 a.m. and in Rock Creek Park opposite the Art Barn from 10 a.m. to 4 p.m. Skates rent for $2.50 an hour, with groups of five or more getting a 50-cent reduction. Knee and elbow pads are available, but the only helmet is used by co-owner Ruth Coy, who can't skate.

Coy and partner Susan Eagle also offer lessons and outfit private parties. In May they'll be joining the American Cancer Society for a charity Skateathon in Baltimore. For details, phone 899-1313 or 899-2233.

Wheelies who'd rather own than rent can pick up a state-of-the-art skate at Pure Fun Skateboards in Silver Spring for around $135. They're also available at Family Bicycles in Capital Heights, which specializes in rewheeling indoor skates with outdoor wheels, "big ones with good grips," says owner Charles Kiser. A set of eight can go for $24 for Nikes or $60 for the Kryptonics.