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      05-11-2012, 05:06 PM   #1
yemski
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Tire load rating 98Y vs 100Y

So I just got some Michelin PSS 275 35 19 100Y to go on the rears of my stock rims/suspension 1M.
However I just noticed that the stock PS2 are rated at 98Y, will there be any issues mounting the PSS rated at 100Y?
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      05-11-2012, 07:46 PM   #2
ozinaldo
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Quote:
Originally Posted by yemski View Post
So I just got some Michelin PSS 275 35 19 100Y to go on the rears of my stock rims/suspension 1M.
However I just noticed that the stock PS2 are rated at 98Y, will there be any issues mounting the PSS rated at 100Y?
No. It means that basically it can handle more weight load on each tire than the stock 98Ys. Less than 98 could be a problem and just maybe. More, no.

Their speed rating (Y) is the same and that's what matters most.
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      05-11-2012, 08:10 PM   #3
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Quote:
Originally Posted by ozinaldo View Post
No. It means that basically it can handle more weight load on each tire than the stock 98Ys. Less than 98 could be a problem and just maybe. More, no.

Their speed rating (Y) is the same and that's what matters most.
Great thanks!
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      05-12-2012, 01:08 PM   #4
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Doesn't it mean the sidewalls are stiffer to support the extra load?
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      05-12-2012, 02:27 PM   #5
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Probably but I doubt any human can feel the difference between 98 and 100 rated and otherwise identical tires.
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      05-12-2012, 06:07 PM   #6
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Quote:
Originally Posted by ozinaldo View Post
Probably but I doubt any human can feel the difference between 98 and 100 rated and otherwise identical tires.
yup just got them mounted and went for a long drive. No discernible difference in ride quality between the 98Y PS2 and the 100Y PSS. I actually think the PSS is more compliant and the grip is better, but in MDM I can still get the TC light to flash in first and second. I know they need to be broken in for maximum grip though.
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      05-12-2012, 08:51 PM   #7
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[quote=yemski;11950231]yup just got them mounted and went for a long drive. No discernible difference in ride quality between the 98Y PS2 and the 100Y PSS. I actually think the PSS is more compliant and the grip is better, but in MDM I can still get the TC light to flash in first and second. I know they need to be broken in for maximum grip though.[/QUOTE

They are brand new tires. You shouldn't even push them to limit before 300 to 500 kms, can be dangerous if you brake hard for example, happened to me because they are still with the protective layer. Be patient and be smooth, they will grip better and better and also will ride smoother than PS2 in every condition.

Another thing I noticed I think they like a bit more air pressure than the PS2 to perform good. You can try different pressures to find the sweet spot. I go with 36 front 34 rear psi for regular city driving.
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      10-30-2012, 07:43 PM   #8
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Hey guys,

I am looking at changing to Goodyear Eagle F1 Asymmetric 2 tyres but the load ratings are slightly lower at 93 front and 94 rear, even though the speed rating is still the same (Y). My understanding is these tyres are going to be OEM fitment on the newly sold (still current) M3's in Australia.

Is this going to be a problem on my 1M?

Andrew
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      10-30-2012, 08:45 PM   #9
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Quote:
Originally Posted by And1M View Post
Hey guys,

I am looking at changing to Goodyear Eagle F1 Asymmetric 2 tyres but the load ratings are slightly lower at 93 front and 94 rear, even though the speed rating is still the same (Y). My understanding is these tyres are going to be OEM fitment on the newly sold (still current) M3's in Australia.

Is this going to be a problem on my 1M?

Andrew
Not ideal on paper but I doubt there can be any real problems. Think this way; the same PS2 tires were used on M3 which is quite heavier than a 1M but they shared the same load rating tires. Why? Because it is easier and cheaper to keep just one tire in stock for similar models for factories even if they weigh differently. Now, under normal conditions you shouldn't have any issues because even those new ratings should cover your car's weight.

There is one possibility though, if you track your 1M heavily under certain conditions there will be extreme weight transferences on one or two tires. That comes to mind.

I was very curious about that new Goodyear too, they should be good in wet. Not sure if they are a perfect choice for 1M but if you try them you can tell us.
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      10-30-2012, 09:13 PM   #10
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I have been making further enquiries with my insurer and I can't legally fit tyres with a lower rating in Australia so the insurance will not be valid. So I am looking to go to the PSS's with a 275/35/19 on the rear with the 100Y rating as in the first post. Too bad as I had the F1A2's on my TT and they were brilliant in the wet and excellent in the dry.
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