Originally Posted by daleks

I recommend 2x12's. I have a pair of 3' segments with 45 degree mitre cuts at the end I wedge under the front tires before pulling forward and jacking up my front end. The true size of a 2x10 is 9 1/4", which isn't wide enough to fully span a 245mm (9.65 inches) tire. I pushed my compound mitre saw (dual sliding 10") to the limit though doing a cut like that on a 2x12 (11 1/4").