After 4 years of ownership and 18K miles, I finally got rid of my run flats. I made the mistake of not rotating tires and the right rear one wore out faster than the other...as was to be expected when not rotating. So, rather tthan replacing it, it was a few hundred dollars more to get all new tires. Got the Potenza 960ASs and I noticed the difference right away...a very comfortable and quite drive with very good control and responsiveness. Now to my question. I normally ran my run flats at 32# up front and 35# in the rear. I did this to sort of maintain the 3# difference between front and rear, and also to hedge against tire pressure loss. The folks that put the tires on recommended that I go 35# all around. I live in SoFL where it is quite warm most of the year (70s-90+s). What do you guys think of the same pressure all around?
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Same tire pressure on all 4 corners?
- Thread starter Flycaster
- Start date
On FK452 I run 31f/33r, maybe 31.5f
That is on 18" staggered wheels/tyres by the way.
Running 35psi all round seems a bit excessive.
Tyre wear will dictate what is the ideal pressure, and the inner rear tyre wear aside (from lots of negative camber), mine are wearing nice and flat, so I guess I am about right at the pressures chosen.
Dave
That is on 18" staggered wheels/tyres by the way.
Running 35psi all round seems a bit excessive.
Tyre wear will dictate what is the ideal pressure, and the inner rear tyre wear aside (from lots of negative camber), mine are wearing nice and flat, so I guess I am about right at the pressures chosen.
Dave
i don't agree with the guys who put on your tires. in the end it's not like their advice is bad, but i think it really depends on driving habits as well. must be a reason that bimmer recommends more tire pressure at the rear. car was obviously engineered that way. you want to trust the guys at the tire shop or the engineers at bimmer?
i have 235 up front (225 is stock) to take out some understeer, 255 rear (stock size)
but i'm with Whippy, tire wear will tell you a lot
i have 235 up front (225 is stock) to take out some understeer, 255 rear (stock size)
but i'm with Whippy, tire wear will tell you a lot
Most of my driving is regular kind of driving with some spirit occasionally thrown in. My rft's are not staggered, 225x50x16 all around. My front tires have shown much better wear than the rears and they showed no evidence of uneven wear. I checked them every month, and adjusted them to 32/35 as it seemed that there was always some pressure loss in the warm weather. The rears wore more rapidly. As the car handled well and the rear faster wear-out was most likely due to non-rotation and the nature of rear wheel drive, I think I will maintain the 32/35 aspect (as I do agree there must be a BMW reason to put more juice into the rears than the fronts) and make sure that I rotate the tires annually (which for me is about every 4-5K miles).
I believe the main reason there is different tire pressures between front and rear tires is both the balance of the car weight wise and the different size tires. I use slightly higher (2-4psi) than the stock settings on the PS2's and haven't noticed any abnormal wear. Like someone said the best way is to measure the tread wear and adjust as needed. Another way is do like the track guys and put the tire at a certain pressure drive around a bit then measure the inside/middle/outside of the tire tread to determine if the tire is properly inflated. Do a search on a track forum perhaps on this one to get a better explanation and how-to if you decide to go the tire temp route.
If in doubt I contact the tyre manufacturer who will give you their recommended settings for the vehicle and tyre fit. It’s then a case of experimenting. Remember that ambient temperature can also effect tyre pressures and winter pressures should be slightly higher than summer to achieve the same wear patterns but variations are minimal (1-2psi). Always use the same tyre pressure gauge to check pressures as these can vary in accuracy significantly and check pressures ‘cold’ i.e. before use.