Different size tyres front and rear

[Rbatt]

My 2003 Boxster 2.7 came with 235/35/19 on the front and 275/35/19 on the rear when I bought it a year ago. I have just changed the rears and the garage said that I should really have 275/30/19s on the rears.

I did about 10,000 miles on the previous tyres which were on the car when I bought it. I have really struggled to unstick the rear in the dry and even in the wet it handles well. How might the lack of reduced aspect ratio(?) between the fronts and rears affect the handling?


My 997 has 35s on the front and 30s on the rear.