Rear tires mismatch
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Thread: Rear tires mismatch

  1. #1
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    Rear tires mismatch

    I have Pirelli Sottozero winter tiresicon and one has a bubble. Porsche can’t find them anymore and have recommended Dunlop.
    Do I need to now replace both rears as not not have a mismatch? I have tire insurance so they will replace the one tire.

    Help....Thoughts?

    Thanks

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    Re: Rear tires mismatch

    Opinion-Yes, particularly if they have different tread patterns and different compounds (very likely on both counts) as the traction will be different.....maybe not dangerous but if it were me, I would do both.

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    Re: Rear tires mismatch

    Since Porsche made the recommendation, I would assume that the tires are compatible. How old and how many miles are on the tires?

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    Re: Rear tires mismatch

    First I would check with Tire Rackicon myself. Then if unavailability is confirmed, I would replace both rear tires with whatever they recommended versus the Porsche dealership recommendation. They are certainly more knowledgeable about tires. There have been handling complaints when front and rear tires are different and I would imagine that different rear tires would be even worse.

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    Re: Rear tires mismatch

    Am I correct that these are "winter tiresicon" ? I googled "Pirelli Sottozero" and that's all I saw. If so, it would be safe to drive with some caution until the temps and road conditions improved. Then get the summer tires on and go like hell.
    Last edited by RSchwerer; 01-30-2019 at 05:48 AM.
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    Re: Rear tires mismatch

    When mixing different front to rear tread patterns, rubber compounds, or even just tire brands, you should always be prepared for the car to be more prone to understeer or oversteer since the grip balance is upset.

    But I would never mix tires from side to side. It can be permissible on regular cars and trucks, but I would discourage it on a performance based vehicle.
    You're not going to die from it, but the handling characteristics will be sacrificed from what it should be.
    Also, how many miles on the good tire? I would not throw a brand new tire on one corner with a tire more than 50% worn on the other side.

    Are these still N spec tires that Porsche is recommending?
    Is your tire insurance willing to reimburse you if you source the tire from a 3rd party? OnlineTires, SimpleTire, Amazon, and many other online sources have most tires in stock, even those that have been recently discontinued.

    If it were me, I'd replace both rears and save the good Pirelli. Sell it on Craigslist or keep it as an emergency spare.

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    Re: Rear tires mismatch

    Quote Originally Posted by RSchwerer View Post
    Am I correct that these are "winter tiresicon" ? I googled "Pirelli Sottozero" and that's all I saw. If so, it would be safe to drive with some caution until the temps and road conditions improved. Then get the summer tires on and go like hell.
    I tend to agree with this, if the tire remains serviceable then continue to drive this season on it and revisit it next winter, why buy a new pair of tires for the balance of this season. If it is not serviceable then drive the Mini and still wait until next season!
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    Re: Rear tires mismatch

    Why in the h_ll are mentions of suppliers being changed to that worthless icon symbol. Is this something new from this site? I mentioned _ire rack (intentionally disguised to prevent it from happening again) and it was changed to that symbol. WTF?

    Hey admin. What's going on???

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    Re: Rear tires mismatch

    Tire Rackicon, Tire Rack, Tire Rack.

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    Re: Rear tires mismatch

    Quote Originally Posted by Budman View Post
    Why in the h_ll are mentions of suppliers being changed to that worthless icon symbol. Is this something new from this site? I mentioned _ire rack (intentionally disguised to prevent it from happening again) and it was changed to that symbol. WTF?

    Hey admin. What's going on???
    Weirder yet, it replaced my mention of w-inter t-ires (remove the hyphens) with that stupid icon. Must be considered dirty words.
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    Re: Rear tires mismatch

    Oh good, I thought it was just me....

    If we are talking about w1nter t1res, then it's really not the tire or season for performance driving anyway. Might as well mix tires with whatever Porsche has to offer, until summer.

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    Re: Rear tires mismatch

    I had a similar problem and wasn't able to find an identical replacement from Porsche or TireRack for the Pirelli winter tiresicon on my 2007 Cayman S. This past October I was able to purchase matching, fresh replacements for my Pirelli W240 Sottozero Series II 255/40R18 (95V) from Tires-Easy.com . T_res-E_sy dot com . (tires easy) Very happy with the purchase. (If the supplier gets erased, PM me.)
    Last edited by topdownride; 02-06-2019 at 10:39 AM.

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    Re: Rear tires mismatch

    Don't ever mix tire brands side to side. Never. Ever. Aside from handling issues (sorry yes this could kill you) the overall diameter of the tires will always be slightly different. Even if they say they're exactly the same size new (not tire size rating but actual diameter in inches), the used one will be smaller. Unless you don't mind working on your transaxle afterwards that is.

    And yes if you drive your Porsche to enjoy it's performance, the tire compound and tread pattern should be the same on all four wheels. And yes that means snow tires on all four wheels too. I don't like the rear end breaking loose before the front does if I have the weight balanced properly in a corner. And in the winter, 'go' needs to be equal to 'whoa' and the fronts do most of the braking. Just sayin'.

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    Re: Rear tires mismatch

    Quote Originally Posted by MyNameIdeasWereTaken View Post
    Oh good, I thought it was just me....

    If we are talking about w1nter t1res, then it's really not the tire or season for performance driving anyway. Might as well mix tires with whatever Porsche has to offer, until summer.
    Maybe in GA...here in the frozen north EVERY season is performance season. A good set of winters on an snow covered road offers as many smiles per mile as the same road in summer. When I’m purposely sliding around corners with PSM off, my preference is tires that have equal tread compound and depth. When the roads are dry but the temperature is -20 or -30, I definitely want to know my tires are in top form.

    Definitely replace in pairs...and consider holding the dealer’s feet to the fire on replacing just one tire with a mismatched compound/tread pattern. Ask them if they’ll accept liability (in writing) if you have an accident due to loss of control? If you press the issue, I bet you get two tires if they can’t find a match for the bubbled one.
    Last edited by gcurnew; 02-06-2019 at 09:08 PM.
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    Re: Rear tires mismatch

    Quote Originally Posted by gcurnew View Post
    Maybe in GA...here in the frozen north EVERY season is performance season.
    Here in GA, we run summer tires all year because winter temps are rarely below 40°F.

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    Re: Rear tires mismatch

    Quote Originally Posted by MyNameIdeasWereTaken View Post
    Here in GA, we run summer tires all year because winter temps are rarely below 40°F.
    That would make low speed four-wheel drifts around corners on country roads much harder. Parking brake assisted rotation would be tough, too. With good winter boots and a bit of experience, a completely different Porsche personality comes out to play on snow and ice-covered asphalt. Most people put their 911s, Caymans and Boxster into hibernation...the ones that don’t know that all the sports cars are as much fun in the winter as the summer.
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    Re: Rear tires mismatch

    Quote Originally Posted by gcurnew View Post
    That would make low speed four-wheel drifts around corners on country roads much harder. Parking brake assisted rotation would be tough, too. With good winter boots and a bit of experience, a completely different Porsche personality comes out to play on snow and ice-covered asphalt. Most people put their 911s, Caymans and Boxster into hibernation...the ones that don’t know that all the sports cars are as much fun in the winter as the summer.
    It's not only fun, it is a great way to learn how to control a sliding car. The potential consequences of losing it while hooning around like Chris Harris on dry pavement are pretty severe, but at low speeds with snowbanks around a mistake will likely result in just embarrassment. Just don't hit a curb.
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    Re: Rear tires mismatch

    Quote Originally Posted by gcurnew View Post
    With good winter boots and a bit of experience, a completely different Porsche personality comes out to play on snow and ice-covered asphalt. Most people put their 911s, Caymans and Boxster into hibernation...the ones that don’t know that all the sports cars are as much fun in the winter as the summer.
    Not sure if this was directed at me... But I think you misunderstood. We're lucky to see half a day of snow a year. Kind of silly to run winter tiresicon or all seasons in a region that doesn't see temps below 40°F in the dead of winter.

    Though I do agree about snow drifting fun. I've done a lot of ice racing up north and rallycross events.
    Not that it's hard to get summers and even racing tires to break loose when you want them to. A Scandi flick or a hard turn throttle blip with traction control off and you can make the nose of these car point in any direction you want.

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    Re: Rear tires mismatch

    Quote Originally Posted by gcurnew View Post
    That would make low speed four-wheel drifts around corners on country roads much harder. Parking brake assisted rotation would be tough, too. With good winter boots and a bit of experience, a completely different Porsche personality comes out to play on snow and ice-covered asphalt. Most people put their 911s, Caymans and Boxster into hibernation...the ones that don’t know that all the sports cars are as much fun in the winter as the summer.
    Naw, hot at harder, these cars slide just the same on grippy pavement as slush, you just have to drive a lot faster! My MyNameIdeasWereTaken, I DD summer tires all year round, RE-71R. I find I slide a whole lot less on these tires than winter tiresicon, even when it's 20F out. If it snows, the whole area shuts down anyway so eh. I have snow tires but I hate them and never put them on the car because the grip is just so godawful poor in literally every other condition.

    I don't hoon on public roads regardless of condition, though, it's just not safe; there's plenty of opportunity for that from autocross and track. Autocross especially is great for driving to the limits of your car and hooning like it's a snowy day, only you're actually doing it at 60mph on dry pavement.

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