Getting ready for the driving season and was wondering what everyone was setting their tire pressure at.
On my M Coupe the recommendation is 32 all the way around with a note to up the rears to 36 if I'm loading up the back of the car. I've found the 32 square works well for even tire wear for my driving.
I run the door jamb specs on 17s. On 18s I bump a couple psi front and rear.
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Nathan in Denver
1999 M Roadster, VFE V3 S/C, Randy Forbes Reinforced, Hardtop, H&R/Bilstein, Apex PS-7, Supersprint
1999 Z3 2.8 Coupe, Headers, 3.46, Manual Swap, H&R/Koni, M Geometry/Brakes, M54B30 Manifold, Style 42
I ran the door jam specks (32psi) on my 16" X 7" square set up with 225/50 Pilot Sports and got near perfect tire wear. This year I mounted a set of staggered 17" x 8.5" Rear with 245/40 and 17" X 7.5" 225/45 up front and I'll start with the door jam specs. which is 32psi again and go from there as the tires show wear.
The weather's not quite good enough here yet to take the car out. I'm waiting 'til I'm sure all of the salt has been washed off the roads.
This thread appears to be an older one but it seems this is a good place to start. 2001 Roadster. 3.0i 5 speed. Everything I read, including the door tag, has 32 to 35 PSI. However my sidewalls read 50 PSI. They're brand new Michelin Pilot Sports. 225/45 ZR 17's on the front. 245/40 ZR 17's on the rear. Straighten me out here. What PSI should I be going by? Thanks in advance............
98 M Roadster, KYB/H&R with pads for moderate lowering. ContiSport 275-40-17 RR & 235-45-17 FR. I run about 35 FR & RR. I don't do burnouts, but push often in corners. I'm on my second set of tires. I got about 22k miles out of the rears, and 30k miles out of the fronts. Always had good even wear. I don't check them often. When they get down around 32, the ride is slightly better, but it feels a bit mushy. ..... P.S.: driving season here starts around Jan1, and ends around Dec 31.
MAX LOAD @ PSI is not a running recommendation.... unless you are at max load.
Since this thread is chock full of random numbers, I'll toss mine in. 26 front, 22 rear. About 4K miles per set, with very even tire wear, and the smoke is a pleasant color.
/.randy
'slightly off topic but I rear tire go flat during the winter storage and when I filled it, it had a slow leak, Upon investigation, I found a 1 1/4" spiral finishing nail dead center of the tread and straight in. It makes me wonder if someone didn't set that nail up on a 45 degree angle against my tire while I was parked somewhere. It's hard to imagine how a headless, thin nail could have gotten in like that.
I know roofing nails are really bad for causing flats because they are short with a large head that tends to flip the nail upright when run over. ('sorta' like stepping on a rake. 'not that I have ever done that...much)
I guess I'll never know for sure. I bought a repair kit and installed a plug. 'seems to be holing well.
I'm running my Bridgestone Potenzas at 32 all around. I used to put in a couple of pounds extra when I had Pilot Sports as I felt they were too compliant around corners.
I also found that not all tire pressure gauges are accurate. I have one that I like that resembles a spray gun. The hose locks onto the valve stem so with one hand you can pull the trigger to inflate then check the built in gauge for the pressure. It also has a bleeder in case you've gone too far. Unfortunately, it is wildly inaccurate. It reads 26 when it is actually 32. (all 4 of my other gauges agree)
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