heli_ca

Hi to all,

I have a new 545i with sport package; the front wheels are 18x8 and the rears are 18x9. I want to mount Dunlop Graspic DS2 Dsst 245/40-18 tires, but the dealer said that they are too narrow for the rear rim(18x9). From talking to the people at the tire rack and what I read in the forums, it should be ok? Safe?

Any thoughts?


Thanks

Leon

ScorpioBMW1

Hi Leon, I was contemplating doing the same with my 545 as well...I was going to go with the Dunlop Winter Sport M3's though. Same size 245/40-18. Tire rack assured me that the tire would fit the wider rear rim without a problem. I decided on the all season Pirelli P zero Nero. FYI removing the runflats can be a pain in the butt for the tire shop. Took the guys working on my car almost 2 hours and a cost of $110 In my opinion your best bet would be to get another set of rims for your winter tires. You can get a decent set of replicas for about $650.
Good luck, George

hinckley

Hi Leon, I was contemplating doing the same with my 545 as well...I was going to go with the Dunlop Winter Sport M3's though. Same size 245/40-18. Tire rack assured me that the tire would fit the wider rear rim without a problem. I decided on the all season Pirelli P zero Nero. FYI removing the runflats can be a pain in the butt for the tire shop. Took the guys working on my car almost 2 hours and a cost of $110 In my opinion your best bet would be to get another set of rims for your winter tires. You can get a decent set of replicas for about $650.
Good luck, George
[/quote]

I mounted the same size Dunlop Winter Sport M3s (245/40-18s) on the different size rims without a problem. And BTW, I'm blown away with the ride and the grip of the M3s. It's vastly superior to the E39/M2 combo that I had in the past.

ricky

Hi Leon, I was contemplating doing the same with my 545 as well...I was going to go with the Dunlop Winter Sport M3's though. Same size 245/40-18. Tire rack assured me that the tire would fit the wider rear rim without a problem. I decided on the all season Pirelli P zero Nero. FYI removing the runflats can be a pain in the butt for the tire shop. Took the guys working on my car almost 2 hours and a cost of $110 In my opinion your best bet would be to get another set of rims for your winter tires. You can get a decent set of replicas for about $650.
Good luck, George
[/quote]

I mounted the same size Dunlop Winter Sport M3s (245/40-18s) on the different size rims without a problem. And BTW, I'm blown away with the ride and the grip of the M3s. It's vastly superior to the E39/M2 combo that I had in the past.
[/quote]


I mounted Dunlop winter 245/40 18" last week and I had to buy two rear 18x8 rims 124 style (same as front) in order to fit rear tyres 245/40 18"

heli_ca

Hi Leon, I was contemplating doing the same with my 545 as well...I was going to go with the Dunlop Winter Sport M3's though. Same size 245/40-18. Tire rack assured me that the tire would fit the wider rear rim without a problem. I decided on the all season Pirelli P zero Nero. FYI removing the runflats can be a pain in the butt for the tire shop. Took the guys working on my car almost 2 hours and a cost of $110 In my opinion your best bet would be to get another set of rims for your winter tires. You can get a decent set of replicas for about $650.
Good luck, George
[/quote]

I am planning to use the stock 18 rims as my winter set and get new 19 or 20s for the summer so im hoping that i made the right decision on buying 245/40-18 for the stock wheels.

hinckley

ricky,

Tirerack, here in the States, claimed that the same tire could be mounted on the staggared rim size and my BMW dealer had no problem doing it. If it's not too late, maybe you could try another shop?

heli_ca

ricky,

Tirerack, here in the States, claimed that the same tire could be mounted on the staggared rim size and my BMW dealer had no problem doing it. If it's not too late, maybe you could try another shop?
[/quote]

Hi,

The dealership would not install the tires on the rear wheels, they suggested that for liability reasons they could'nt. They instead suggested that I purchase new rear rims that are the same as the front 8" wides. I took the rear wheels and installed them where I bought the tires. The wheels are now on the car and I will pick up the car Friday morning.
The dealer is still chirping (gently) that the sidewalls slope away from vertical too much as the rim spreads the sidewalls. Anyone know of anyone that had problems with this?

Rudy

Someone posted a pic of their winter tires mounted on the factory rear wheels a while ago. Although it can be done, the tires looked very stretched and would more than likely affect the tires performance and possibly affect the safety of the tire...

Rudy

I found the pic I was thinking about where the rear tire looked quite stretched on the rim. CRRobert posted it in this message...

I can't say for sure the exact size tire he's using but I think he mentions the 245 in another post.

cobradav

[/QUOTE]I have a new 545i with sport package; the front wheels are 18x8 and the rears are 18x9. I want to mount Dunlop Graspic DS2 Dsst 245/40-18 tires, but the dealer said that they are too narrow for the rear rim(18x9). From talking to the people at the tire rack and what I read in the forums, it should be ok? Safe?
[QUOTE]

I just checked the Michelin, Bridgestone, Dunlop, and Continental tire specs. All MFRS show recommended rim width of 8 - 9.5 inches for 245/40 18. No reason for dealers reluctance on a 9 inch width. A reputable tire store would have this info and not have any hesitation nor would I be concerned.