R56 Cooper S - Ditching the Runflats on R112s

[PrancingHorses]

Picked up a MCS (2011) R56 the car came on a brand new set of run flats running R112 rims - the ride quality is borderline dangerous - the car bounces around everywhere! Is this because the tyres are still new or is that a characteristic of the RFTs?

Has anyone changed to normal tyres and if so what did you go for? Would it be a like for like swap in terms of tyre sizes to the non run flats? Thanks

[PrancingHorses]

df76 said:

PrancingHorses said:

Picked up a MCS (2011) R56 the car came on a brand new set of run flats running R112 rims - the ride quality is borderline dangerous - the car bounces around everywhere! Is this because the tyres are still new or is that a characteristic of the RFTs?

Has anyone changed to normal tyres and if so what did you go for? Would it be a like for like swap in terms of tyre sizes to the non run flats? Thanks

Good timing. I bought a 2010 R56 on Sunday, runflats all round and very worn on the back. Horrific. In the wet yesterday they were plain dangerous (polar opposite to the Rainsports on my last car). Ride quality was horrendous and tramlining all over the place. Earlier today I fitted normal Yokos in 215/45/17 size (Advan Sport v105s - £80 each), what a difference. It's still "firm" but the crashing has completely gone and it's all much more composed (it's never going to be a limo though).

Thanks the standard tyre size is 205/45/17 so what made you go with 215's? Was this advised or something you tried yourself?

[PrancingHorses]

df76 said:

PrancingHorses said:

Thanks the standard tyre size is 205/45/17 so what made you go with 215's? Was this advised or something you tried yourself?

There's plenty of discussion in various forums. For me they offer a small amount of extra rim protection, slightly higher tyre wall (improve comfort, but minimal) and they were about £20 a tyre cheaper. No significant negatives.

Cheers - what about insurance - you are now on non standard tyres!?

[PrancingHorses]

Thanks so seems like everyone has there own preferred option for non run flats:

205/45/17
215/40/17
215/45/17

Would be interesting to know the rim style you are running - mine are R112 JCW wheels - thanks