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Discussion summary
YOUR RESEARCHTire Guru's Question, pls.
Leading reported evidence
Run 225/40 18's
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Suggestion · Original poster
I currently run 225/40 18's on the front and 285/30 18's on the rear (Sumi HTRZ111's) and they have been great.
Leading evidence: 'Run 225/40 18's' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Run 225/40 18's' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
I am running 235/275 on 18x7.5/10 wheels with PSS9 and GT3 sways with adj end links and the car has understeer even with the narrower rear tire (it could be tuned out with the suspension but I just got the car so a little understeer is a good safety net, and tuning out just takes grip away from the rear when I'd rather add grip to the front).
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Suggestion
Going to 265mm or bigger up front you have to start running wheel spacers and maybe roll the fender lip.
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Suggestion
going with 11" rears like the gt3 setup and run with 295 is an option.
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Suggestion
I am running 235/275 on 18x7.5/10 wheels with PSS9 and GT3 sways with adj end links and the car has understeer even with the narrower rear tire (it could be tuned out with the suspension but I just got the car so a little understeer is a good safety net, and tuning out just takes grip away from the rear when I'd rather add grip to the front).
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I currently run 225/40 18's on the front and 285/30 18's on the rear (Sumi HTRZ111's) and they have been great. I am starting my research on new sneaks and would be interested in the new Michelin Super Sports, BUT, they only come in 285/35 18 rears......could I do this? I will be lowering my car a bit with the new suspension shortly, will it fit? Would it work problems? Thankx guys, in advance, for your assistance,
R\
Scott
those diameters are reaching close the the 4% error rule of thumb and may cause prob with the abs/psm system. The threshhold of the system would decrease and may get in the way on the ragged edge.
here is the calculation.
Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
225/40-18 3.5in 12.5in 25.1in 78.8in 804 0.0%
285/35-18 3.9in 12.9in 25.9in 81.2in 780 3.1%
going with 11" rears like the gt3 setup and run with 295 is an option. I think the tires are more prevalent in that size.... with less error.
Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
225/40-18 3.5in 12.5in 25.1in 78.8in 804 0.0%
295/30-18 3.5in 12.5in 25.0in 78.4in 808 -0.5%
Ferd- thankx- I will have to take another hard look at what are my options. I may have to go with PS2's, as I don't think Super Sports are available in 295's.
wait a little! and the correct fitments will b available for the super sports! very diff if not impossible to find the ps2s for the 996,worth the wait i believe,hard to beat the michelins
randy308- I was jsut on tire rack.com checking as the PS2's were also recommended. Yes, the Michelins are the gold standard, it seems, but good options in our sizes (285/30 ZR 18) are difficult to find. I might need two more Sumi HTRZ111 rears, then next season, hopefully Michelin will not leave us out there as bastard children. From what I am hearing/reading, this far, the MSS are the ticket!
R\
Scott
I would try to get a wider front tire on if you can - what is your front wheel width? 285 or 295 out back with just 225mm in front is really going to make the car understeer even worse.
I am running 235/275 on 18x7.5/10 wheels with PSS9 and GT3 sways with adj end links and the car has understeer even with the narrower rear tire (it could be tuned out with the suspension but I just got the car so a little understeer is a good safety net, and tuning out just takes grip away from the rear when I'd rather add grip to the front). I know you can get a 245mm to fit on the front if you have an 8 or 8.5" wide wheel. Going to 265mm or bigger up front you have to start running wheel spacers and maybe roll the fender lip.
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