215 / 75 /15 AT tyres

I know this has been done to death but. On a Gen 4 how much on road prefrmance is lost by fitting these tyres. Took my Jimny off road today on a pig farm I was inpressed with it's performce on stock tyres although I did take some easy routes through the farm. If I had decent AT tyres I would have gone to more difficult area of the farm, By the way I was there to shoot crows not just to drive round the fields.
 

Very little. They are only 1.5% bigger circumference than the standard 195/80r15 tyres.

I'll say it depends. You can go for relatively light toyo open country at's to really heavy bfg km3 mt which are 6kg heavier for each tyre.
That rotating mass slows the acceleration and hinders braking.

crash486 JB74W

Interests me that it seems to be the accepted wisdom that wider tyres equal better traction. I run standard size mud terrains for trialling, my old boss had a hilux on wide tyres some years ago, was always getting stuck because not enough weight in the truck to get traction down. Young guy in our club with a jimny on wide tyres was struggling for grip on wet grass in a trial, narrow tyres sometimes get in the ground better.
I drive dumpers and they don't have particularly wide tyres when you consider their weight.
Then again, wide tyres look cooler....

Groundworker wrote: Then again, wide tyres look cooler....

There's your answer! And there's not much choice in taller narrow tyres these days. 215s aren't a wide tyre, but certainly wide enough for a Jimny.

Groundworker wrote: Interests me that it seems to be the accepted wisdom that wider tyres equal better traction. I run standard size mud terrains for trialling, my old boss had a hilux on wide tyres some years ago, was always getting stuck because not enough weight in the truck to get traction down. Young guy in our club with a jimny on wide tyres was struggling for grip on wet grass in a trial, narrow tyres sometimes get in the ground better.
I drive dumpers and they don't have particularly wide tyres when you consider their weight.
Then again, wide tyres look cooler....

I think it depends on the terrain and exact tyres. Sometimes wide tyres work very well. But as a rule I've found most places I've been in the UK, that narrow tyres work better off road.

That said, 215 is pretty skinny compared to some of the tyres I've got!