winter tyre

My neighbour has a VW Golf and a spare set of R16 winter tyres that he has offered me. I have just put them on my 16 plate Leon FR TDI and they are pretty close to the calipers (about 4mm clearance at narrowest margin). The manual doesn't say much about tyre sizes, but the petrol flap says it...

just been having a play around, and in the convenience menu, there's a "winter tyres" option . . i've not looked in the manual :( but there's nothing on it one here so thought I'd throw it in the mix!!! You can change a maximum speed it seems, mine's set at 150 or 155 at the moment but what...