Anyone know

[hogey]

I want to put some General Grabber AT tyres on my Shogun but they do not make them in 285 x 55 x18 but closest the do is 285 x 60 x 18
Would it be ok to change the profile from 55 to 60 ?

 

[XYZ]

As long as you have the clearance there should be no problem. It might affect your speedo but I believe this would be less than 1% so not much to worry about.

 

[Wingy]

As above check clearance, may affect on full lock.
My Hilux will take 65 profile tyres but I put 70 profiles on it (17") and they rub the under arches on full lock. But the scraping gets less as the tyres & arch liners wear out.

 

[Rushjob]

The 60 series tyre would be about 30mm greater in diameter than your 55 series as fitted at the mo which would equate to your speed of 74/75mph for a speedo reading of 70mph.

 

[shootingduckdog]

I agree with both of the above. I went bigger and they rub and they also affected my speedo about 5mph. (actually making it spot on!!)

 

[Sinistral]

I want to put some General Grabber AT tyres on my Shogun but they do not make them in 285 x 55 x18 but closest the do is 285 x 60 x 18
Would it be ok to change the profile from 55 to 60 ?

All you need is Pi ......

Rolling Circumference:- 285/55/18 = 2324 285/60/18 = 2410 diff = 86mm

Speedo error @ 70mph the actual speed is 72.6mph - so 3.7% true difference (cumulative mileage will be out to same degree)
ATB

 

[csl]

This is quite a handy tool for doing the speedo and outer diameter comparisons....

Tire size calculator

For your sizes...

 

[hogey]

thanks for all the replies.some good technical info there