Tyre Size Issue

[Magura]

Greetings.

Had my 2006 997 C2 for 10 months and time for new rubber. Not yet tried OPC but visited a local dealer who I trust and have used for previous BMW tyres.

Currently fitted are Conti Sport Contact 3; FRONT 235/40/ZR18 and REAR 265/40/ZR18 both N1 rated.

Tyre Shop think this is unusual and state that rears should be 35 to give same overall rolling diameter.

I would be grateful for collective wisdom about this.

I have noted that I can get N1 rated replacements for both my current tyres but 35 profile for the rears seem only to be available N2. Can N1 and N2 be interchanged? What is the difference? Knowing how pedantic OPC are about warranties will this invalidate warranty? I guess just going to the OPC would sort this but still keen to know assembled opinion.

Very many thanks.

[nickfrog]

No those sizes and ratios are correct. Just look in your manual or on the tyre pressure sticker for confirmation.

[Trev450]

Opinions vary on mixing N ratings. I would check with your opc as to their position and if they are ok with it, get it in writing.