Johnson to drive a backup car after Kentucky practice wreck

SPARTA, Ky. (AP) Jimmie Johnson will drive a backup Chevy after wrecking his primary No. 48 car during Friday morning's practice at Kentucky Speedway.

Drivers are getting used to a new asphalt surface and configuration at the 1.5 mile tri-oval along with new NASCAR downforce rules. The six-time Sprint Cup Series champion had posted the second-fastest practice speed (188.121 mph) in 17 laps before his car sustained right-side damage after hitting the wall in turn 4, forcing him to drive a backup car in Saturday night's 400-mile race.

Johnson says he couldn't see where the track was clean, the car wouldn't turn ''in the marbles'' and he ended up in the wall.

SI Apps
We've Got Apps Too
Get expert analysis, unrivaled access, and the award-winning storytelling only SI can provide—from Peter King, Tom Verducci, Lee Jenkins, Andy Staples, Grant Wahl, and more—delivered straight to you, along with up-to-the-minute news and live scores.