astrocrep

Bridgestone Potenza RE960AS Pole Position (Ultra High Performance All-Season)

Size: 225/40ZR18

Stock Rims, No Lowering...

Is that a good tire / size? I want a bit wider then stock... but no rubing and no noticably bulging...

I found this site: http://www.web-cars.com/math/tiresize.html and it says vs. stock, my speedo will be exactly 1 mph to fast at 45mph. (Meaning shows 45mph when I am actually going 44mph)

What do you think?

EDIT : I want to stay will the Best All seasons... to deal with the weather year round in N.J.

Thanks,
Rich

Infernokron

You might look into a 225/45/18 instead, I believe that's closer to the stock size. My brother has 225/40's on his SS/SC, they don't buldge too noticeably but at 75 mph his speedo reads about 79...

If you decide to go with the 225/40, another A/S tire too look at if you havn't allready would be the Micheline Pilot Sport A/S. They are pricey, but Michelin makes nice tires. I have no personal experience with either the Michelin or the Bridgestone your looking at though.

Link to the Pilot Sport A/S: Click Me!!!

If you haven't looked into a set of winter tires and summer tires yet, instead of trying to find an all season tire, it's worth at least looking.

Just a quick copy/paste of a comparison between the stock size v.s. the 225/40/18 and 225/45/18

Top is stock
Middle is 225/40/18
Bottom is 225/45/18

Stock Tire - 215/45R18 >Search Tires Tire 1 - 225/40R18 >Search Tires Tire 2 - 225/45R18 >Search Tires
Section Width: 8.46 in 215 mm
Section Width: 8.85 in 225 mm
Section Width: 8.85 in 225 mm

Rim Diameter: 18 in 457.2 mm
Rim Diameter: 18 in 457.2 mm
Rim Diameter: 18 in 457.2 mm

Rim Width Range: 7 - 8 in
Rim Width Range: 7.5 - 9 in
Rim Width Range: 7 - 8.5 in

Overall Diameter: 25.61 in 650.49 mm
Overall Diameter: 25.08 in 637.03 mm
Overall Diameter: 25.97 in 659.63 mm

Sidewall Height: 3.80 in 96.52 mm
Sidewall Height: 3.54 in 89.916 mm
Sidewall Height: 3.98 in 101.09 mm

Radius: 12.80 in 325.12 mm
Radius: 12.54 in 318.51 mm
Radius: 12.98 in 329.69 mm

Circumference: 80.45 in 2043.4 mm
Circumference: 78.79 in 2001.2 mm
Circumference: 81.58 in 2072.1 mm

Revs per Mile: 812.1
Revs per Mile: 829.3
Revs per Mile: 800.9

Actual Speed: 60 mph 100 km/h
Speedometer1: 61.2 mph 102. km/h
Speedometer1: 59.1 mph 98.6 km/h

Speedometer Difference: -
Speedometer Difference: 2.117% too fast
Speedometer Difference: 1.398% too slow

Diameter Difference: -
Diameter Difference: 2.07%
Diameter Difference: -1.39%