Thanks for the reply. How about 245/40/19 and 275/35/19? I'm just mainly using it for street use and maybe going to try to go on a track in the near future.Well, not knowing what your ideas are for these tires uses are, but if they are Michelins, something like 255/35/19 f and 275/35/19. These will fill up your wheelwells. Your front offset of +50 on a 8.5 inch wheel says you can push the wheels out a little more to get away from your spring perch with a 5 mm spacer. The rear should be fine, but again you could use a 5 mm spacer to push your wheel out if needed. I would think your tires will fit fine with these offsets
I use this combo with a 47 offset in front with a 9 inch wheel, 255/35/18 and 35 offset rear with a 10 inch wheel, 275/35/18 tire. They are RE71R's race tires for autocross. I will be doing a few DE's later this year as well as Porsche Club tour events. My daily driver wheels are also 18's OEM 8 inch in front and 9 inch in the rear with Michelin PSS 235/40/18 and 265/40/18. Hope that helps.
If you are doing mostly street driving, then why not stick to OEM size? That would be optimal in my opinion. Keep in mind that 245/40/19 is close to 5% larger then stock 235/35/19. If you absolutely must go up a size, increase both front and rear to maintain the rear bias as Porsche intended.Thanks for the reply. How about 245/40/19 and 275/35/19? I'm just mainly using it for street use and maybe going to try to go on a track in the near future.
After this past weekend autocrossing on a damp, cold track, I would like to change to 265/35/18 F and 285/30/18 R. Unfortunately Bridgestone does not make a RE71R in 285/35/18 or I would have bought those, instead, I went down one size to 255/35/18 F and 275/35/18 R to keep the sidewalls the same. The car can handle a bigger tire footprint as Ryan Clark showed late last year at the Solo National autocross by winning B/S with this combo. They fit the wheel wells without rubbing and fit on 8.5 and 10 inch wheels. Ryan's car did not have an adjustable rear swaybar, only a Tarett GT front bar. So for those of us with both adjustable bars, we certainly can dial in the balance as least a well as Ryan did.I read through the whole thread and couldn't find a specific example of the tires i'm trying to run. I'm looking at picking up a set of 18x8.5s and 18x10s and pairing them with some RE71Rs.
My first choice is 245/40/18 and 275/35/18. Is that an issue because it's a 1.2% increase in front diameter and a 2.9% decrease in rear diameter?
I know I could do a 235/40/18 with 0% change or a 255/35/18 with have -1.5%. But I'm trying to keep handling balance as similar as possible by increasing wheel and tire width equally front and rear.
Got them installed today and no rubbing =) I got some new TPMS on the new set but when had issues resetting it. Now I have TPMS warning. I used new OEM set of TPMS.I would doubt that you would rub. If the inside does rub, use a 5 mm spacer on both sides and push your wheels out. Apex 10 inch wheels use a 36 offset for 987/981's in the rear, so their wheels are setup closer to the fender lip as opposed to the spring perch.
I messed around it some more today. Finally got it to say process complete. BUT....I still have TPMS light and red "!" on. I just checked the TPMS I bought were OEM 911 ones that has 315mHz it says. Did I get the wrong one? =(You may have to reset a few times, making sure the take off wheels are not even close, so the receiver in your car is only picking your the new TPMS senders. I had to drive around for 20 minutes while my computer was thinking about it. Summer tires for the HRE's, winter tires for the take off's, wheel size, etc. You will get it figured out. Glad they fit.
Take a picture and download it to your computer, then on Planet 9 hit the 3rd button from the right on top of the typing box. Make sure the cuser is down below by a couple of lines you wrote and let the picture rip. What size tire did you decide to install in front to go with the 285/35/19's in the rear? How are the wheel/tire fitment to the ach of the wheelwell? Too much space? May need H&R springs to lower your car 25 mm? I chose Ohlin coilovers, but that was because I knew I want to autocross/DE's and needed the adjustability of the compression/rebound. After you lower it, you can push the wheels and tires out to the edge of the fender lip with wheel spacers depending on your HRE wheel offsets. Let us know your progress.