Tyre size

[danban]

Hi all I'm running stock tyres on stock wheels. I got the van as a project and it had 185,60,14. Will it make much difference to the speed/revs if I went back to that size?
Could do with being a bit lower in height.
Regards Dan

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[sparkywig]

Stock tyre size is 185/R14 (82 aspect ratio) with a diameter of 659mm and a rolling circumference of 2070.3 mm.
185/60/14 have a diameter of 577.6mm and a rolling circumference of 1814.6mm.
So you'll have a ride height reduction of 40.7mm, but your speedo with be over read by 14.09% and your engine revs will rise the same amount for any given road speed.
So indicated 60mph will actually be 51.55mph.

 

[danban]

Stock tyre size is 185/R14 (82 aspect ratio) with a diameter of 659mm and a rolling circumference of 2070.3 mm.
185/60/14 have a diameter of 577.6mm and a rolling circumference of 1814.6mm.
So you'll have a ride height reduction of 40.7mm, but your speedo with be over read by 14.09% and your engine revs will rise the same amount for any given road speed.
So indicated 60mph will actually be 51.55mph.

Thanks for the information. What other sizes do you advise me?
Regards Dan

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[fallingoffalot]

You can check what comes close to the original spec using this.....

https://www.tyresizecalculator.com/tyre-wheel-calculators/speedo-error-calculator