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Tyre Size Calculator, Rim Width Calculator and New Tyre Size Generator all in one (try to keep the radius within + or - 1%).

It's important to keep to the cars original tyre circumference, what we do is fit larger alloy wheels and a smaller profile tyre to compensate, otherwise gearing, speedo, engine management could be affected, this tool can be used to ensure this. Can also be used to find cheaper alternative sized tyres, therefore saving you money.


Tyre Size to Compare Diameter Circumference Fits Wheel Rim
Tyre Size
Show / Hide specific tyre size to compare against.
When speedometer reads mph/kph your actual speed will be   mph/kph.

Possible new tyre sizes, which will maintain the original tyre circumference or rolling radius
within + or - 1% which is adjustable below, mph/kph is also adjustable below;


Tyre Size   Diameter        Circumference    Difference  Speedo  Fits Wheel Rim
----------  --------------  ---------------  ----------  ------  --------------
195/70 R14  628mm / 24.72"  1973mm / 77.68"  -0.95 %     69.33   5.5x14 to 7x14
185/75 R14  634mm / 24.96"  1992mm / 78.43"   0.00 %     70.00   5x14 to 6.5x14
175/80 R14  636mm / 25.04"  1998mm / 78.66"   0.30 %     70.21   5x14 to 6.5x14
205/60 R15  628mm / 24.72"  1973mm / 77.68"  -0.95 %     69.33   5.5x15 to 7x15
215/60 R15  640mm / 25.20"  2011mm / 79.17"   0.95 %     70.67   6x15 to 7.5x15
195/65 R15  634mm / 24.96"  1992mm / 78.43"   0.00 %     70.00   5.5x15 to 7x15
225/50 R16  632mm / 24.88"  1985mm / 78.15"  -0.35 %     69.75   6x16 to 7.5x16
205/55 R16  632mm / 24.88"  1985mm / 78.15"  -0.35 %     69.75   5.5x16 to 7x16
195/60 R16  640mm / 25.20"  2011mm / 79.17"   0.95 %     70.67   5.5x16 to 7x16
245/40 R17  628mm / 24.72"  1973mm / 77.68"  -0.95 %     69.33   8x17 to 9.5x17
255/40 R17  636mm / 25.04"  1998mm / 78.66"   0.30 %     70.21   8.5x17 to 10x17
225/45 R17  634mm / 24.96"  1992mm / 78.43"   0.00 %     70.00   7.5x17 to 9x17
205/50 R17  636mm / 25.04"  1998mm / 78.66"   0.30 %     70.21   5.5x17 to 7x17
285/30 R18  628mm / 24.72"  1973mm / 77.68"  -0.95 %     69.33   9.5x18 to 11x18
295/30 R18  634mm / 24.96"  1992mm / 78.43"   0.00 %     70.00   10x18 to 11.5x18
245/35 R18  628mm / 24.72"  1973mm / 77.68"  -0.95 %     69.33   8x18 to 9.5x18
255/35 R18  636mm / 25.04"  1998mm / 78.66"   0.30 %     70.21   8.5x18 to 10x18
215/40 R18  630mm / 24.80"  1979mm / 77.91"  -0.65 %     69.54   7x18 to 8.5x18
225/40 R18  638mm / 25.12"  2004mm / 78.90"   0.60 %     70.42   7.5x18 to 9x18
315/25 R19  640mm / 25.20"  2011mm / 79.17"   0.95 %     70.67   10.5x19 to 12x19
255/30 R19  636mm / 25.04"  1998mm / 78.66"   0.30 %     70.21   8.5x19 to 10x19
215/35 R19  634mm / 24.96"  1992mm / 78.43"   0.00 %     70.00   7x19 to 8.5x19
225/35 R19  640mm / 25.20"  2011mm / 79.17"   0.95 %     70.67   7.5x19 to 9x19

Width ( to ) Profile ( to ) to
Difference MPH/KPH TyreCalc/TireCalc version 2.2 - 22/02/2013. DSCommerce 2004-2013.

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