What rear 15inch tyres to maintain gearing

[coopster]

Anyone know what size of rear tyres would be best to maintain stock gearing when using 15inch wheels?

cheers volksfolks

 

[Dave.P]

http://www.tacomaworld.com/forum/tirecalc.php?tires=195-45r16-185-60r14" onclick="window.open(this.href);return false;
Try this.

 

[reezvaan]

Would that be 185/55R15?

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[coopster]

according to that site should be a 60/65 profile on 15's should work out the same as 185/70r15

 

[Karmann70]

195 / 65 r 15

 

[reezvaan]

Shouldn't tyre width be irrelevant? I mean it shouldn't matter whether the tyres are 185/65R15 or 195/65R15.



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[sparkywig]

Shouldn't tyre width be irrelevant? I mean it shouldn't matter whether the tyres are 185/65R15 or 195/65R15.



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Tyre width is very relevant because it's an aspect ratio, so 65% of 195mm is greater than 65% of 185mm.


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[reezvaan]

So 195/65R15 all round would mean almost same gearing ratio as well as almost same speedo calibration then?

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[coopster]

I might be being a bit thick but I thought the 65 or 70 was sidewall height in mm?? I've never heard of aspect ratio

 

[coopster]

ignore that last post - just googled it - everyday is a school day