Hey folks

Looking at some winter tyre options to tyre swap on my G05 M-Sport with 740 M 20" wheels.

Specs are:
Front 275/45, 9.0 offset 35
Rear 305/40, 10.5 offset 40

I've decided on RFT and tyre swap. I've had non-RFT winters, and both tyre swap and wheel swap options before, so know the pros/cons of each scenario.

Would like the Michelin Alpin 5 RFT, 275/45 on all corners. No issue on the front but I'd be using narrower tyres on the wider rims at the back.

There are very few winter RFT options for 305/40 on the rears. Think Pirelli is the only option.

The Michelin's are just within the manufacturers recommended range of 8.5-10.5", but I'm wondering if there are likely to be any issues using a narrower tyre on a wider rim?

Appreciate any thoughts/experiences?