A Pleasant Hills man was critically injured today when his motorcycle crashed into the rear of a tour bus on Fifth Avenue in Oakland, police said.

Daniel Ridenour, 25, had been riding his bike west in the 3400 block of Fifth Avenue around 7 a.m. when he attempted to change lanes to pass another vehicle.

He swerved into the right-hand curb lane and accelerated, but a Lenzner tour bus was in his path in that lane.

The motorcycle slammed into the rear of the bus.

Investigators said the bike left a 30-foot skid mark before the crash.

Mr. Ridenour was taken to UPMC Presbyterian.

First Published: July 15, 2009, 7:15 p.m.