20" tire sizes?
#1
#3
295/40/20 is the closest matchup currently available. It is a slightly taller setup. There is nothing I have found after extensive search that will exacty match the stock setup. The ideal as far as tallness would be 305/35/20. Here is a link to a good tire/wheel calculator. Use column "B" for the larger wheel sizes as there are more selections available in the drop down menu. http://www.c5-corvette.com/tirecalc.htm
#4
got this from that corvette site.
"If your speedometer has been calibrated for 295/45 R 18 tires, replacing them with 305/35 R 20's would result in the speedometer reading high by 0.17%."
Actual Speed Indicated Speed with Tire B Speedometer Error
5 mph (8.04 kph) 5.01 mph (8.06 kph) +0.01 mph (+0.01 kph)
10 mph (16.09 kph) 10.02 mph (16.12 kph) +0.02 mph (+0.03 kph)
15 mph (24.13 kph) 15.02 mph (24.18 kph) +0.02 mph (+0.04 kph)
20 mph (32.18 kph) 20.03 mph (32.23 kph) +0.03 mph (+0.05 kph)
and the list keeps going on. not too bad considering our speedos are off a few mph from the factory.
"If your speedometer has been calibrated for 295/45 R 18 tires, replacing them with 305/35 R 20's would result in the speedometer reading high by 0.17%."
Actual Speed Indicated Speed with Tire B Speedometer Error
5 mph (8.04 kph) 5.01 mph (8.06 kph) +0.01 mph (+0.01 kph)
10 mph (16.09 kph) 10.02 mph (16.12 kph) +0.02 mph (+0.03 kph)
15 mph (24.13 kph) 15.02 mph (24.18 kph) +0.02 mph (+0.04 kph)
20 mph (32.18 kph) 20.03 mph (32.23 kph) +0.03 mph (+0.05 kph)
and the list keeps going on. not too bad considering our speedos are off a few mph from the factory.
#6