Tyres, Alloy Wheels, Batteries & Invertors
Call Us: (172) 273 7453, 507 5169

Tyre Up Size Calculator

Upsize Calculator for Your Tyres

Well if all that maths seems a little beyond you, and judging by the volume of e-mails we get on this subject, we’ve made a little below to help you out. Select the tyre size you currently have, and then the size you’re interested in. Calculate each tyre size and then click on the Click to calculate the difference button. It will show you all the rolling radii, circumferences, percentage differences and even speedometer error. Happy Upsizing!

Current Wheel/Tyre

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R
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Current rolling circumference
mm

upsize calculator

New Wheel/Tyre

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R
downarrow

Current rolling circumference
mm

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Difference in circumference:
mm or

%
United Auto Centre recommends an Upsizing only if the difference if less than 2%
So when your speedo reads 70 kmph, you’re actually travelling at

kmph

A Speedometer error means an odometer error too.

It stands to reason that if you change the rolling radius of your wheels and tyres, and the speedometer no longer reads correctly, that your odometer will also gradually become inaccurate. Assume for example that you bought a car brand new and changed the wheels and tyres on day one from 195/65R14 to 205/50R15 – not an uncommon change. By the calculator above, that makes your speedometer over read by 1.7%. Consequently, the registered odometer reading will also be out by the same value. So for example, when you get to 10,000 km of driving (in the real world), your odometer will actually read 10,170 km. OK so that’s not a huge difference but it is one of the reasons why most car dealers have a disclaimer on their secondhand vehicles telling you that they won’t guarantee the displayed mileage. (“Clocking” the odometer is the other reason). Odometer errors due to mis-matched tyres and wheels will happen on regular odometers as well as the newer digital ones.

Reach Us

United Auto Centre
SCF 413, Motor Market Complex, Manimajra
Chandigarh, Chandigarh, India 160101
Phone: 172 273 7453 , 172 507 5169
Email: info@unitedautocentre.in

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