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  • Tyre Size Calculator

Compute Tyre Upsize

Easiest Way to check Tyre Upsize.

» Step 1: Mention Existing Tyre Profile, Calculate in Dimensions

» Step 2: Mention Proposed Tyre Profile, Calculate in Dimensions

» Step 3: Compute Difference in Tyre Circumference to assess in whether the Proposed Tyre is fit or misfit

Car-Tyre

R15 185/65 : Here 185 is Tyre Width, 65 is Aspect Ratio and 15 is RIM Size

Existing Tyre

Tyre Width
Tyre Aspect Ratio
RIM Size

New Upsize Tyre Considering

Tyre Width
Tyre Aspect Ratio
RIM Size
Existing Tyre
Proposed Tyre
Difference

Tyre Height:
Tyre Width:
Circumference:
Sidewall:


Final Deviation:

Ground Clearance Change:

Interpret Results of Tyre Upsize Deviation

» In Negative : Your Proposed Tyre is actually smaller in Size compared to existing One and not Recommended. Its rather Downsize

» 0 to .5% : Almost Close Match without any Variation to Odometer Speed Reading

» .5% to 2% : Acceptable deviation, can be upsize but recommended to take Opinion on MyCarHelpline Forum

» 2% to 2.5% : Aggressive Upsize, have to have reason before considering this Tyre Upsize, may take opinion on MyCarHelpline Forum

» Above 2.5% : Not Recommended


Tyre Upsize Maximum Limit Basis RIM Width

You might have seen Wheel Size as R16 205/60, 6J or R16 205/60, 6.0*16 Inch Alloys. Here 6J or 6.0 is what the Wheel Width and is specified in inches. One should not deviate from Maximum Tyre Width against the specific Wheel Size. Follow below Calculator sheet

RIM Width (Inches) Ideal Tyre Width Maximum Tyre Width
4.5J 155mm to 165mm 175mm
5J 165mm to 175mm 185mm
5.5J 175mm to 185mm 195mm
6J 185mm to 195mm 205mm
6.5J 195mm to 205mm 215mm
7J 205mm to 215mm 225mm
7.5J 215mm to 225mm 235mm
8J 225mm to 235mm 245mm
8.5J 235mm to 245mm 255mm
9J 245mm to 255mm 265mm

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