View Single Post
  #13  
Old 09-25-2011, 02:26 PM
Rez's Avatar
Rez Rez is offline
Member
 
Join Date: Aug 2009
Location: WNY
Posts: 475
Rez is on a distinguished road
These are the differences between tire sizes. The 295/40 is has slightly bigger overall diameter and side wall. The increased diameter partially fixes the erroneous speedo of BMW, speedo would continue to read faster than actual speed in fact but with less margin. Otherwise no other ill effect. I did this primarily to be able to drive the car in winter as well and got a few other benefits as extra bonus. I can not think of any downside except running into a flat tire one day for which I have the space saver.
TIRES
WHEELS TIRE & WHEEL PACKAGES ACCESSORIES
TIRE & WHEEL TECH

Stock Tire - 315/35R20 >Search Tires Tire 1 - 275/40R20 >Search Tires Tire 2 - 295/40R20 >Search Tires
Section Width: 12.40 in 315 mm
Section Width: 10.82 in 275 mm
Section Width: 11.61 in 295 mm
Rim Diameter: 20 in 508 mm
Rim Diameter: 20 in 508 mm
Rim Diameter: 20 in 508 mm
Rim Width Range: 10.5 - 12.5 in
Rim Width Range: 9 - 11 in
Rim Width Range: 10 - 11.5 in
Overall Diameter: 28.68 in 728.47 mm
Overall Diameter: 28.66 in 727.96 mm
Overall Diameter: 29.29 in 743.96 mm
Sidewall Height: 4.34 in 110.23 mm
Sidewall Height: 4.33 in 109.98 mm
Sidewall Height: 4.64 in 117.85 mm
Radius: 14.34 in 364.23 mm
Radius: 14.33 in 363.98 mm
Radius: 14.64 in 371.85 mm
Circumference: 90.10 in 2288.5 mm
Circumference: 90.03 in 2286.7 mm
Circumference: 92.01 in 2337.0 mm
Revs per Mile: 725.2
Revs per Mile: 725.7
Revs per Mile: 710.1
Actual Speed: 60 mph 100 km/h
Speedometer1: 60.0 mph 100. km/h
Speedometer1: 58.7 mph 97.9 km/h
Speedometer Difference: - Speedometer Difference: 0.068% too fast Speedometer Difference: 2.126% too slow
Diameter Difference: - Diameter Difference: 0.07% Diameter Difference: 2.09%
Reply With Quote

Sponsored Links