New tires needed. Best experiences appreciated.

[da1_imp]

Hi guys,

I'm changing my tyres but I'm a bit confused about something concerning the "clearance"
I mean, as you know we cannot use 160 rear because the max allowed dimension is the 140.

I read a thread that speaks about this but, due to my not complete understanding of english, I have two troubles:

1-is it really necessary to modify the internal space for a 2014 black edition?
2-when the 160 is allowed it dependos on the model of the tyres or not


thanks for your comprehension
ciao