Tire Calculator - Free
There are many good tire calculator apps so why choose this one? Most other tire apps allow you to enter two different tire sizes and then provide a detailed numerical comparison of their total diameters etc. TireCalc Free takes a different approach
- one that is more suited to the real-world scenario of having existing tires mounted on a vehicle but then wanting to replace the wheels using rims and tires that have different dimensions while preserving the same overall diameter as the existing wheels. TireCalc Free makes this easy by:
• rapid input of the existing tire size using 'spinner-dials' rather than using keyboard entry;• instantly providing a list of alternative tire sizes that provide a good match the existing tire's overall diameter;• the list of alternative sizes can be filtered down by specifying a desired rim size and/or maximum allowed difference in diameter (expressed as a percentage): this 'difference percentage' equals the resulting speedometer error.• Again, the selection of preferred rim size and maximum difference is made easy using convenient spinner-dials rather than by old-fashioned text input.
TireCalc Free also provides additional pages that explain everything you need to know when shopping for new tires:
• explanation of sidewall markings (e.g. 245 / 45 / ZR17 etc);• definition of 'aspect ratio';• math formula used to calculate the overall wheel diameter;• table of speed-rating code letters;• table of maximum load indices.
- one that is more suited to the real-world scenario of having existing tires mounted on a vehicle but then wanting to replace the wheels using rims and tires that have different dimensions while preserving the same overall diameter as the existing wheels. TireCalc Free makes this easy by:
• rapid input of the existing tire size using 'spinner-dials' rather than using keyboard entry;• instantly providing a list of alternative tire sizes that provide a good match the existing tire's overall diameter;• the list of alternative sizes can be filtered down by specifying a desired rim size and/or maximum allowed difference in diameter (expressed as a percentage): this 'difference percentage' equals the resulting speedometer error.• Again, the selection of preferred rim size and maximum difference is made easy using convenient spinner-dials rather than by old-fashioned text input.
TireCalc Free also provides additional pages that explain everything you need to know when shopping for new tires:
• explanation of sidewall markings (e.g. 245 / 45 / ZR17 etc);• definition of 'aspect ratio';• math formula used to calculate the overall wheel diameter;• table of speed-rating code letters;• table of maximum load indices.
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Reviews (5)
Jam. B.
Jan 18, 2018
Cannot select 75 aspect for 14s worthless if it doesn't have all sizes
Pat. S.
Dec 24, 2015
Potential to be the best tire calculator on the market, but with only metric sizes and limited ones at that, it's only good for passenger car tires.
Sha. M.
Nov 23, 2015
I like the way it gives you a list of alternative sizes.
Des.
Jun 27, 2016
Doesn't have all metric tyre sizes
It works well, not only after you've pulled your hair out and swipe the wheel size and percentage variance fields. Please find a way to graphically convey this. I was seconds away from asking how to change calculated wheel size...