Michelin Pilot Road 3s...I joined the club

[Cormanus]

So, you talked me into it. What opinion does the shop book have on acceptable alternative tire sizes? Anyone? Thanks.
You know, like my auto owners manual even. It lists two sizes acceptable for my car. The dealer will sell and mount either but not something else. I suppose it is because he is a good dealer and I would not change tire sizes on my car to something other than that specified. Especially if I then put my kid in it or risk someone else's kid in a vehicle I share the road with while driving my car with tires not meant for my car.

So I need to get this right. What does Honda say?

10W30 or 10W40 in warmer weather.

For tyres: 110/80R 18M/C 58V for the front; 140/70R 18M/C 67V for the rear.