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Been running number 2 for about 2 years. When I went in to swap the fronts, my tire guy told me don't do 275. If anyone has a 275 upfront on the stock wheel, can they upload a picture?
[Edit] I had 15mm spacers in the rears before and they rubbed like no other. I had them removed within an hour.
There are several tire threads in the meantime and discussions. 1 or 2 seems to be used by some folks, however just fyi, the PS4S is actually slightly wider than the OE PSS in stock size. As I've said in other threads, going wider adds unsprung weight that will compromise the handling for a bit more traction. Going wider in the front also increases the likelihood of tramlining and aquaplaning. I've stuck with stock size. The PS4S by itself has noticeably better lateral grip than the PSS, and in the meantime it's available in AMG spec for the front. As far as the rear is concerned, I will likely get the BMW Star variant next. TireRack offers this as a combo. The BMW Star variant has a different compound make up from the standard PS4S that is more similar to the Cup 2, so increased dry grip with a bit less wet grip.
There are several tire threads in the meantime and discussions. 1 or 2 seems to be used by some folks, however just fyi, the PS4S is actually slightly wider than the OE PSS in stock size. As I've said in other threads, going wider adds unsprung weight that will compromise the handling for a bit more traction. Going wider in the front also increases the likelihood of tramlining and aquaplaning. I've stuck with stock size. The PS4S by itself has noticeably better lateral grip than the PSS, and in the meantime it's available in AMG spec for the front. As far as the rear is concerned, I will likely get the BMW Star variant next. TireRack offers this as a combo. The BMW Star variant has a different compound make up from the standard PS4S that is more similar to the Cup 2, so increased dry grip with a bit less wet grip.
Swiss, does your tires look stretched like the stock PSS? I went wider so I can square that off.
Swiss, does your tires look stretched like the stock PSS? I went wider so I can square that off.
Not as much as the PSS. The PSS looked very stretched. Here's a sideview of the PS4S. A bit of stretch is desired as it strengthens the sidewall during cornering. Making it too square causes the tire to roll over its sidewall.
You know, this makes complete sense because for some reason my fronts were cooked faster than the rears the last time I replaced them. I had wires showing on the inner tire and my rears still had about 40-50 percent left.
You know, this makes complete sense because for some reason my fronts were cooked faster than the rears the last time I replaced them. I had wires showing on the inner tire and my rears still had about 40-50 percent left.
That will continue to happen. The front has very aggressive camber on these cars, and the toe seems to easily get out of alignment over time. I got about 8k out of my last set on the front and closer to 12-13k for the rears. I actually got a bit more out of the PSS in the front. I replaced the first set at 10k miles with wires showing on the inside and found the toe was out of spec. The PS4S as said only lasted 8k miles before I noticed wires showing, and again, the toe was out of spec in the front. This time less than before. I'm scheduled for my A1 service on Jan 10, but I've only driven about 4k miles since the last service, but I plan to have them check the alignment.
There are several tire threads in the meantime and discussions. 1 or 2 seems to be used by some folks, however just fyi, the PS4S is actually slightly wider than the OE PSS in stock size. As I've said in other threads, going wider adds unsprung weight that will compromise the handling for a bit more traction. Going wider in the front also increases the likelihood of tramlining and aquaplaning. I've stuck with stock size. The PS4S by itself has noticeably better lateral grip than the PSS, and in the meantime it's available in AMG spec for the front. As far as the rear is concerned, I will likely get the BMW Star variant next. TireRack offers this as a combo. The BMW Star variant has a different compound make up from the standard PS4S that is more similar to the Cup 2, so increased dry grip with a bit less wet grip.
thanks for the info. I’m in the UK, is annoyingly pretty wet here (why I am not a fan of the SS tyres).
but you’re right maybe I should trust that amg knows best and stick to the stock sizes and just change to the ps4s. I’m sure the vast majority of the grip improvement comes from the change in compound anyway.
I always forget 80% of C63s owners aren’t on the forums and just stick to the usual amg specs.
maybe I could keep stock front size and go 295 or 305 on the rear. Might look a bit mismatched
Last edited by gentlemang; Jan 4, 2022 at 05:38 PM.
thanks for the info. I’m in the UK, is annoyingly pretty wet here (why I am not a fan of the SS tyres).
but you’re right maybe I should trust that amg knows best and stick to the stock sizes and just change the ps4s. I’m sure the vast majority of the grip improvement comes from the change in compound anyway
Yes, the PS4S has noticeably better wet grip. I believe they still have the shortest wet braking distance among its peers, which ultimately translates to the grip for acceleration. However, the key to tire performance is temperature. The PS4S is still a summer high performance tire and while it does much better in the cold and wet compared to the PSS, the grip falls off noticeably below about 15C. At around 10C, the PSS just wouldn't really hook up anymore. The PS4S does better at those temps, but you will spin the wheels as high as 3rd gear if temps drop. Summer performance tires need heat in them to develop their full grip. I can tell you it's night and day on a nice summer canyon run with the tires reaching temps above 60C. The PS4S starts feeling in its element around 37-40C, so you may wanna take a look at the TPMS display and see what your typical tire temperatures are. If they are generally cold, you might wanna consider the PS AS4.
Yes, the PS4S has noticeably better wet grip. I believe they still have the shortest wet braking distance among its peers, which ultimately translates to the grip for acceleration. However, the key to tire performance is temperature. The PS4S is still a summer high performance tire and while it does much better in the cold and wet compared to the PSS, the grip falls off noticeably below about 15C. At around 10C, the PSS just wouldn't really hook up anymore. The PS4S does better at those temps, but you will spin the wheels as high as 3rd gear if temps drop. Summer performance tires need heat in them to develop their full grip. I can tell you it's night and day on a nice summer canyon run with the tires reaching temps above 60C. The PS4S starts feeling in its element around 37-40C, so you may wanna take a look at the TPMS display and see what your typical tire temperatures are. If they are generally cold, you might wanna consider the PS AS4.
I’m in London so doesn’t get too cold here generally, just a bit wet. My last few cars were m3/M4s and yep I am looking forward to the summer here to enjoy the c63 properly!
I have a C63 coupe with the forged cross spokes but since I have a non-S car they're 19s all around. I went with 275/35/19 and 305/30/19 and they fit fine with no rubbing (stock ride height and no spacers) and the traction is improved over the stock Continentals the car came with.
There are several tire threads in the meantime and discussions. 1 or 2 seems to be used by some folks, however just fyi, the PS4S is actually slightly wider than the OE PSS in stock size. As I've said in other threads, going wider adds unsprung weight that will compromise the handling for a bit more traction. Going wider in the front also increases the likelihood of tramlining and aquaplaning. I've stuck with stock size. The PS4S by itself has noticeably better lateral grip than the PSS, and in the meantime it's available in AMG spec for the front. As far as the rear is concerned, I will likely get the BMW Star variant next. TireRack offers this as a combo. The BMW Star variant has a different compound make up from the standard PS4S that is more similar to the Cup 2, so increased dry grip with a bit less wet grip.
I'll be interested to hear your thoughts on the star BMW spec. I'm going to be upgrading the tires on my sedan and at 255/275, I have the option of running front, M01 and rear *BMW or both F/R *BMW.
Your car looks mean. Are you running spacers? Also how much did you lower the car?
Thanks appreciate it. No spacers, wheels are custom made billet mono blocks. I think I lowered 20-30mm with KW HAS from memory I can’t really remember. Also have K-Mac camber kits fitted as well.
Thanks appreciate it. No spacers, wheels are custom made billet mono blocks. I think I lowered 20-30mm with KW HAS from memory I can’t really remember. Also have K-Mac camber kits fitted as well.
How's traction with that much tire in the rear? Your car looks mean as hell; nicely done.
I found the PS4S (305/30R20) to be useless on these cars. They don't seem to handle the torque very well. My tyre guy said he had the same complaint from Supra, BMW and high horsepower Mustang owners. I replaced them after a month with Nankang NS-2R Semi-slicks, and although the nankang were a little bit better, I couldn't get the best out of them because they needed to be within a specific heat range that was not practical to achieve on the street - with speed limits and traffic lights, stop signs etc. I replaced those with Continental Sportcontact 7 and will probably never look back for a street tyre. As an example, when the car was stock the rear end would break out in second gear from 60 km/h pull on the PS4S tyres. From a 60 km/h pull in second with the Sportcontact 7 the tyres don't break traction at all after a Stage 2 carless tune on the car. That's roughly 120hp more and 250 N.m of torque more than stock. they just seem to grip so well. The Pirelli PZ5, Goodyear Eagles and Bridgestone Potenza Sport outperformed the PS4S in wet and dry braking and produced faster lap times. The PS4S is still a good tyre, but it's 12 year-old technology now. Other manufacturers have not only caught up, but even outperform the PS4S.
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