I've just had some new 225/45/17 Bridgestone SO3s fitted and was wondering what I should set the tyre pressures to. I've got them set as mentioned in the handbook (33 at the front and 28 at the back), but was wondering if the rear really ought to be a bit higher?

Thanks,
Iain

Anyone? I need to know today as I drive down to Cornwall early tomorrow morning...

Thanks,
Iain

i run 34 f , 32 r on mine
mark

Tyre pressure is depending on your car set up. Bump steering or not, Whell allignment standard or not, Spring/dampers and your driving style, how do you want your car to behave ?
General rule for street tyres is, more pressure = more grip but take care not to exceed the max pressure ( measured hot) listed on the sidewall of the tyre. The standard pressure listed in your user guide is a good start, I recommend to add + 3-4 PSI front and rear and then adjust the rear to you find the ballance you need.
With bump steer adjustment and a rear adjustable ARB I now run same pressure front and back 2,5 bar around 37 PSI
As you see there is no answer to you question, it's up to you driving style.

34/32

Thanks :)

dont go mad on the pressure mate , i bought i set of wheels from a guy and wanted to test run them B4 i handed over the ££££ ..holey shi* was like i was driving on an ice rink ....all over the place so went to garage while out testing ...Front 50 PSI back 54 PSI ....mad mate think just the very centres of the tyres were gripping at thet ...lol

take care

mikey

Blimey, I wasn't thinking of doing anything so drastic, (probably 32/34).

Thanks anyway...

What about 36/33?:)
JIM

just try some presures and adjust them slightly till your happy. I'm running 34 front and 32 rear this week.

I've found that not only does grip level and balance of the car change quite significantly, but also the wear rate. My car gets used every day and I cover about 2k miles per month. I quickly realised that "Designer" tyres like the Toyo's etc were just too soft a compound and as such I was replacing them every 3-4 months due to wear or because of punctures £1500 a year on tyres was not funny :(
With the Toyo's Goodyears, etc I found that running them at 36/34 would get me an extra months worth of use, but I found that the outside edges on the fronts would go first followed by the inside and if I really pushed my luck, i'd get down to the wear indicators :eek:
I now run BG Goodrich Profiler G's. Not the worlds most awe inspiring tyre, but VERY hard wearing. I'm looking at just needing to change mine now (Fronts anyway) after nearly 15k and a track day, the rears are still going strong :D
As the tyres are harder, they seem to respond best to lower pressures that promote even wear. I run these at 34 all round. 32 in the rears when 4 up seems to make the car feel like it's got flat tyres :(
So in summary, If it's a second car, get yaself some "designer" tyres, they work well, and will last you a year or so. If you use the car daily and are not hoofing around like a loon everywhere, then get something that will last. Most of us have nowhere near the skills, nor the space to drive on the ragged edge all day everyday, wearing our tyres out, so why spend £400+ on summat that can be had for £300 ;)

Just my ikkle bit of input

Mikey :cool: