I stumbled upon this really nifty utility on the internet. Kouki Tech has this really cool Flash-based utility where you can easily compare different tyre and wheel sizes both through hard numbers (end result of circumference, diameter, sidewall height) as well as visually see how different the tyre sizes will be. It’s very useful if you want to change to a tyre size that’s different from your car’s original size. The utility will also tell you how off your speedometer reading will be. Click the image above to access the Visual Tyre Size Calculator by Kouki Tech.
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Paul Tan
After dabbling for years in the IT industry, Paul Tan initially began this site as a general blog covering various topics of personal interest. With an increasing number of readers paying rapt attention to the motoring stories, one thing led to another and the rest, as they say, is history.
damn difficult to explain this to uncles and pa's about the importance of tire sizes…at the tire shops, once the rim size matches, its an all go…little do they take into account the profile, diameters and other relevant measurements…sigh
Just popped in to see where the sudden influx of traffic came from. Glad you like my wee utility, its basic compared to some but I was going for ease of use over masses of numbers. I'm currently developing V2 of the calculator as well as a visual wheel offset calculator.
PS, for those confused about the term "rolling radius", don't be. Its a daft term I picked up somewhere and probably only makes sense in my head. It is actually the circumference of the wheel & tyre combination.
Nice one paul :)
best !!!
wonderfull !
I usually go to this site to check tyre sizes
http://www.miata.net/garage/tirecalc.html
Instead of Flash it uses Java.
how to measure the rolling radius? how come diameter is alot smaller than radius? pls clarify
try this site
http://www.1010tires.com/tiresizecalculator.asp
damn difficult to explain this to uncles and pa's about the importance of tire sizes…at the tire shops, once the rim size matches, its an all go…little do they take into account the profile, diameters and other relevant measurements…sigh
How to use this application, cannot click on anything.
rolling radius is circumference, not diameter.
try this..
http://www.wheelsmaster.com/rt_specs.jsp
http://www.1010tires.com/TireSizeCalculator.asp
My regular tire size calculator
no need to click .just choose all the number given
http://www.wheelsmaster.com/rt_specs.jsp
What about this 1.
yipeee~~
for my case:
from 175/70/13
to 195/50/15 only 0.1% difference ;)
Rolling radius = radius of wheel + height of sidewall
eg 205/50/16
205 is width of tyre in millimeter
50 is the profile or aspect ratio or height of the sidewall of the tyre and is expressed in percentage of width, 50% of 205 = 102.50mm
16 is the diameter of the wheel in inches
radius of wheel is 1/2 of its diameter, 16/2= 8 inches
1 inch = 25.4mm
8 inches = 25.4 x 8 = 203.20mm
Therefore, rolling radius = 203.2 + 102.5 = 305.70mm
Rolling radius = radius of wheel + height of tyre's sidewall
eg 205/50/16
205 is the width of the tyre in millimeters
50 is the profile or aspect ratio or sidewall height, expressed in percentage of width,
50% of 205 = 102.50mm
16 is the diameter of the wheel in inches
radius is 1/2 of diameter, 16/2 = 8 inches
1 inch = 25.4mm,
8 inches = 25.4 x 8 = 203.20mm
Therefore, rolling radius = 203.2 + 102.5 = 305.70mm
sorry for double post.
my post didn't appear at when I checked at 10.24am, so I resubmitted my comment.
and that is when the double appeared..
http://www.rims-n-tires.com/rt_specs.jsp is the most complete online calculator in this tire size comparison I've seen.
Hi,
Just popped in to see where the sudden influx of traffic came from. Glad you like my wee utility, its basic compared to some but I was going for ease of use over masses of numbers. I'm currently developing V2 of the calculator as well as a visual wheel offset calculator.
If anybody has an idea or suggestion for ways to improve the caculator then please feel free to leave a comment here:
http://www.kouki.co.uk/tyre-size-calculator-v2-wi…
PS, for those confused about the term "rolling radius", don't be. Its a daft term I picked up somewhere and probably only makes sense in my head. It is actually the circumference of the wheel & tyre combination.
tyre circumfrace.
gearbox ratios.
with calculations, this data enebles you to find speed of the car in relation to rpm.
here's another one, complete with tyre width, offset, revs per mile, whether the new rim will hit the fender or not, other size suggestion etc etc…
http://www.rims-n-tires.com/rt_specs.jsp