Tyre-Size-Calculator.info | Compare tyres and wheels + graphical demonstration

[badger84]

Hello Forum!

I want to introduce you to my newly released tire size calculator:

www.tire-size-calculator.info

You can compare your existing and future tires and / or wheels of your vehicle. You also get a nice graphical demonstration of how the tires and / or wheels look like in comparison.

You can calculate values such as circumference, speedometer difference, changes relevant to the ride height or the effect of wheel spacers and learn which tires or wheels fit best for your car.

I hope the tire size calculator can help you with your calculations and helps you in deciding on which tires and / or wheels to choose!

Would be nice if you have any suggestions or requests how to make the tire size calculator even more better.

Greetings – Mike!



PS: Admins or mods are welcome to make this thread sticky to help also new members of the forum who could need this tire size calculator.

[dom]

That's the best tyre size calculator that I've seen, easy to use and very nice graphics. Good job

[badger84]

Thank you very much dom. I'm happy that you like it 

[badger84]

Hi to everyone!

I got a lot of feedback and many of you wanted to be able to input inch-values and not only metric ones. This is now possible Hope it will help you with your calculations.

If you like the tire size calculator it would be great if you could recommend it also to others!

[nadab_sardar]

Just had a play with this while looking at going from 225/40R18 to 235/35R19 on a GTI. Nice that it shows the speedo difference and the overall diameter change side by side, saves doing the sums on a bit of paper.

One thing that would be handy is a rim width check, so it warns you when a tyre is outside the recommended width range for a given wheel. Plenty of people here end up stretching or squeezing tyres without realising. Also a quick note on how much the speedo error matters for MOT purposes would help the less technical lot.

Good that you added inch inputs, that's a big improvement.

[SRGTD]

Just had a play with this while looking at going from 225/40R18 to 235/35R19 on a GTI. Nice that it shows the speedo difference and the overall diameter change side by side, saves doing the sums on a bit of paper.

One thing that would be handy is a rim width check, so it warns you when a tyre is outside the recommended width range for a given wheel. Plenty of people here end up stretching or squeezing tyres without realising. Also a quick note on how much the speedo error matters for MOT purposes would help the less technical lot.

Good that you added inch inputs, that's a big improvement.

This table should help with your query on rim width; it gives the minimum, maximum and ideal tyre width by wheel width;



The article at the link below includes a section (the last section) on the legal position in the UK of a vehicle’s speedo under-reading and over-reading. The article’s not MOT-specific but hopefully includes the information you need to answer your query;

https://www.thecarexpert.co.uk/how-accurate-is-a-car-speedometer/

[nadab_sardar]

Cheers SRGTD, that's exactly what I was after. Will check the table against the wheel width before I order anything.

Had a read of the article too. Going from 225/40R18 to 235/35R19 by my sums puts the overall diameter up about 1.5%, so the speedo will read a touch lower than before. Most cars over-read a bit from the factory, so I'd expect it to end up closer to true speed rather than under-reading, but I'll check it against a GPS app after fitting to be sure.

Since I'm dropping from a 40 to a 35 profile, I also found this a decent skim on what to expect from the thinner sidewall: https://themobiletyrefitter.co.uk/blog/low-profile-tyres-explained/