Need Tyre Help !

[popeye]

Needing some tyre info
I have a Cooper S 2007 With sports suspension (factory)
Running on 17 " alloys with run flat tyres .
Problem on poor road surface , with power on, the car is all over the road , you can hit a small uneven patch , and the car picks itself up and plonks you
back down 3 feet from your original line often over the white line , for a brown trouser job! I borrowed a Clubman Cooper diesel from a local BMW dealer whilst my car was in for service , And I was gobsmacked same roads full power on,16 inch wheels no sport suspension . The car rock soild only tyre squeal.
My delemar
would fitting 17" by a 50 - 55 series NON runflat tyre help ? can you go up to 50 -55 series ? or do i drop down to a 16 " wheel and 55 series tyres ?
Note all the motoring press consistantly say with sport suspension stick with 16" wheels? they say 17 "18" with sport suspension gives a fidgity harsh ride
I dont fancy taking the spot suspension kit off , SO will a tyre change solve the ride ?
Any wheel and tyre buffs want to comment please .
cheers in advance
Popeye:confused:

[Bogo]

the R56 Cooper S can be a handful. they have plenty of power which will cause a bit of torque steer. As for wheel size it is more the width of the tyre that is the problem as they tend to follow the lines of the road (tram lining) basically following a grove in the road. The sports suspension will not help either as this is designed for smooth roads which is where you will get the most benefit. I dont think a drop to 16" or non runflats will give you the change in handling your are looking for sorry

[ScottinBend]

Actually getting rid of the runfalts did get rid of the worst of this for me.

[Pantyman]

problem I belive is the run flats generally very firm in nature its like driving with wood wheels . maybe if you have the cash try getting a set of coilovers installed that should smooth things out.

[jencooper]

What is it with wow gold?
I`m i missing something?
Or is this in the wrong part of the forum?
Must be getting old but still a junior member!
jc

[Pantyman]

nah Jen its a "bot" basically a computer which logs into forums and leaves radom msgs generally adverts wow gold i think is world of warcraft gold edition .

[jencooper]

Can it not be blocked?