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you really should be keeping all 4 tyres the same size. if you want to go thinner then you would have to increase the profile of the tyre as the attessa computer will get stuffed readings due to the rolling diametre of the wheels being different. i have 265/35/18 on all 4 and i dont have any troubles with that.

you shouldnt have any problems with having differnt size tyres on your gtr, ive been driving with 286 rear and 265 fronts for almost 2 years now with no problems, casue the gtr isnt AWD it 4WD so the front only grip when the back slip which in most cases isnt offten uness you rev and dump and ive been doing that for ages with no worries.

you shouldnt have any problems with having differnt size tyres on your gtr, ive been driving with 286 rear and 265 fronts for almost 2 years now with no problems, casue the gtr isnt AWD it 4WD so the front only grip when the back slip which in most cases isnt offten uness you rev and dump and ive been doing that for ages with no worries.

As you say, the system isn't full time 4WD, however the ATTESSA computer compares the speed of the front and rear wheels and uses this information to decide if there is any slip present.

If you have different rolling diameters between front and rear axles, there will be a constant partial torque split to the front and hence a constant pressure in the transfer case.

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