[Black Grouse]

235/65 R17 is one of the standard sizes - whether you can go up in size AND fit chains, I don't know


Logically, you can go up as long as all four are the same - I'm planning to fit 245/65 R17 next time around.

 

[Black Grouse]

108/106 are the tyre load ratings, 1000 and 950 kg respectively, so 2000/1900 per axle