As the title suggests, when my vrs tsi needs new tyres will 225/45/18's fit without problems? Mainly to increase ride comfort.

I'd like to know as well

Officially, no.

 

Make your own mind up though, only 3.6% difference

 

Would there also be enough clearance though? I'm not to fussed about he speed?

Less than an inch difference on the diameter, so I can't see it being a problem.

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