Originally Posted by
SkinnyLegs
That first test is outdated as is your advice. Attack/Force was updated with Black Chili in 2007. The only difference between Attack/Force and GP4000S now are F/R size specific tires and a slightly different tread pattern which makes no functional difference.
Bingo. Front is 22mm, rear is 24mm with a little better flat/wear resistance, other than that, they are materially the same.