10-12-2017, 10:27 AM | #1 |
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Tyre Options, I've been thinking......
I am about to fit 295/30 R20 on 11.5 rims and 265/30 R20 on 10.0 rims. Then my plan was to replace with 275/35 PSS and 305/30 PSS. But I have been thinking I wonder if 285/35 Michelin Pilot sport Cup2's on the front and 325/30 MPSC2 on the rear might be possible. Seems the 285's and 325's measure up at 11.4" and 13" wide.
I suspect my edge to edge will be close to 12.5 and 11.0 inches I will measure my rims tonight edge to edge and the I can guage clearance with the existing tyres mounted on the wider rims |
10-12-2017, 11:35 AM | #2 |
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guessing 285/35s up front are going to rub or be very close, i think some people run r888s up front on stock rims, but not sure about on wider rims, going to depend on offset.
the best setup going forward (when available) i think are going to be 991.2 GT2RS front tires the MPSC2 N2-generation 265/35/20s and 991.2 MPSC2 N2-generation GT3 305/30/20 rear tires. if you look at tread width specs porsche always max's them out vs the normal run of the mill spec tires. |
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10-12-2017, 03:41 PM | #3 |
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Porsche rim and tyre widths influenced my rim choice the GT3 runs 12x20 with 305/30, they also run 325/30 21 on 12.5x21 for the GT3RS and new GT2. I measured my 11.5 and that are just over 12.5 rim edge to rim edge - 318.5mm so I can see how a 13" width tyre might fit, 305 will be easy
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10-13-2017, 03:15 AM | #4 |
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The fronts were in the workshop, should all be fitted with stock PSS today
Final measurements front rim edge to rim edge 280mm, rear 318.5mm That's 11" front and just over 12.5 rear. Michelin PSC2's look more interesting now the 285/35 measures 11.4 fitted to a 10 and 325/30 measures 13 fitted to a 11.5 Last edited by carrera2RSL; 10-13-2017 at 03:21 AM.. |
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10-15-2017, 12:01 AM | #6 |
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What are the offset of your rims?
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10-15-2017, 03:13 AM | #8 |
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Looking at the back I have 12mm on the inside from the wheel to strut at the rim edge (this will increase as the circumference increases as the strut point towards the rear parcel shelf) and more at the tyres widest point. The wheels actually measure 318.5mm edge to edge and a 325/30 MPSC2 is quoted at 13" wide on an 11.5" rim (Merc AMG GT R I believe) This is circa 330mm, so this suggests 5-6mm 'bulge' each side. So I should be able to still mainatain 5-6mm clearnance on the inside. The outer I think will be tight, my maths suggest I will be virtually the same at the top of the tyre running 295/30 on 20x10 with 15mm spacers.....
At the front I have yet to measure the inside clearance, but it feels 10-12mm plus from the rim edge and the outside is roomy as well, I think the 2985/35 will easily fit, with 7m extra tyre height and radius I will run close to the inner arch in a few places but should be 100% okay I think ! The quoted size is 11.4 or 290mm my wheel measures 280mm rim edge to rim edge and this is only 5mm try bulge, so easy |
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10-15-2017, 08:53 AM | #9 | |
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10-17-2017, 04:11 PM | #11 |
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You planning to track this setup?
A 285 SC2 up front is alot of tire. I am running a 275 PS4S up front and a 305 SC2 rear and it is a pretty nice set up for DD and occasional shenanigans. I am interested to see how this looks and what the final clearances are.
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Last edited by Northern X5M; 10-17-2017 at 04:18 PM.. |
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10-17-2017, 06:20 PM | #12 | |
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10-18-2017, 01:26 AM | #13 |
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I think my tyre choice will be poor to average in the rain, seems MPSC2's are much better than MPSC's in the rain, also seems that Michelin evolve tyres without shouting about it. This tyre is off the new Merc AMG GTR, so a track oriented road car. Supposedly great grip in the dry.
My car is an early 2015 and it's only covered 13k as I get the train to work every day and walk to the station. So less of an issue for me, I might regret it ! Evidently cold and wet they are well behind a PSS or PS4s but in the dry and warm temp..... |
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10-18-2017, 01:33 AM | #14 |
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Okay some more measurements on the front, I have at least 14-15mm on the inside from the rim edge, 12+ of room to the arm for height. This is from the rim edge which measures 280mm across edge to edge, the 265's are flush with the rim edge if i lay a straight edge across.
If the 285 measures as specced on a 10" rim its 13", so 290mm at its widest, thats only 5mm bulge per side, an easy fit the height should be okay too. I think this will be 'easy !" |
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10-18-2017, 04:45 AM | #15 |
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I have to mention your clearance for the tire as it travels through its turning arc on the front. The 285/35 might contact the plastic splash guard in the front. I can't tell from the measurements you post whether you've measured for that? But please, mounting and running them is the surest way to find out! Let us know your results!
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10-18-2017, 06:17 AM | #16 |
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A good point when I looked at the weekend I could see one spot would be tight, I could measure easily, but thoughts that a radius increase of 7mm would be okay as BMW would provide a reasonable clearance
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10-18-2017, 02:03 PM | #18 | |
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It really is the limiting area as the top of the fenders are fine. The wheels still look sunk in even though there is no more space thanks to that section. |
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10-18-2017, 02:47 PM | #20 | |
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I never bothered to look underneath it to see why it bumps out like that. if you do let me know. |
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10-19-2017, 08:29 AM | #22 |
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Final decision 375/35 305/30 MPS4S, seems no one was prepared to send two sets on the understanding they would need to be fitted but not driven, I would pay for the extra carriage... No takers
I also spoke to Michelin and they said the reduced wet weather performance and the need for tyre temperature before gains in grip, put the MPS4S, Plus he said a lot of short road miles on MPSC2 is something the tyre dont like and it can end up good on tread but below par on grip. Shame I fancied trying to squeeze in 325/30's |
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