Hi.
My Terrano had 235/75/15 fitted as standard.
I have just fitted 31x10.50 R15 General Grabber AT2's all round.
Fills the arches nicely, I had to trim a small bit off the inside of the front mud flaps and a slither off the bottom of the front bumper to clear on lock.
None of this is visible when looking at the car.
See my thread 31x9.5 R15 or 31x10.50 R15 for pictures.
Cheers
Steve.