... and you will also gain some topend at the expense of low end torque. ...

and

... increased your tire size from 4 inches to 5 inches, and gained a theoritical 30 mph! in practice there are many other variables, the biggest one is your gearing and engine, but in general a bigger tire means faster vehicle and slower acceleration. ...



nope, last I checked those meant the same... bashinfun's opinion was 'Actually smokin crater sorry to correct you, but the bigger the tire is, the more acceleration and less top end.'

if you want to play with the math without getting dirty head on over here...
http://www.csgnetwork.com/speedcalc.html

try different tire sizes without changing any other variable and see what happens.