TMC is an independent, primarily volunteer organization that relies on ad revenue to cover its operating costs. Please consider whitelisting TMC on your ad blocker or making a Paypal contribution here: paypal.me/SupportTMC

Tire Life 19 vs 21

Discussion in 'Model S: Driving Dynamics' started by rlawson4, Jul 29, 2012.

  1. rlawson4

    rlawson4 Member

    Joined:
    Nov 24, 2011
    Messages:
    257
    Location:
    Atlanta Georgia
    We have all been debating the advantages and disadvantages of the tire choices. I just want to know about tire life expectancy of both. If this is my everyday car, I don't want to be getting new tires all the time. It's not about cost but about time. I don't want to trade time getting oil changes with time at the tire store. I also saw somewhere that the continental tires has some sort of duel life where they are good on rain and dry roads and later just dry roads. If that is true, I cannot waste my time with them. I look forward to hearing from everyone.

    Thoughts please?
     
  2. jerry33

    jerry33 S85 - VIN:P05130 - 3/2/13

    Joined:
    Mar 8, 2012
    Messages:
    12,766
    Location:
    Texas
    Every tire has a treadwear index in the UTQG. A tire with 500 should last five times as long as a tire with 100, and a tire with 50 will last half as long. Standard car tires are typically between 500 and 700 these days.

    Every tire made has a point at which wet performance becomes poor (in a few tires that happens when they are new). Some tires, mostly European and Japanese, have a treadwear indicator that tells you when you have reached this point--this is a good thing in my opinion. Same thing with snow tires. The European and Japanese tires have a snow tire wear bar. The only difference between tires that have the indicator and those that don't is the information given to the driver. Ignorance isn't bliss in the case of tires with low tread depth and driving in the rain. It's nice of the tire manufacturer to tell you this (of course, they mostly do it because in Europe and Japan it's the law.)
     
  3. rlawson4

    rlawson4 Member

    Joined:
    Nov 24, 2011
    Messages:
    257
    Location:
    Atlanta Georgia
    Appreciate the information. So, do we have any numbers on the two tire choices?
     
  4. jerry33

    jerry33 S85 - VIN:P05130 - 3/2/13

    Joined:
    Mar 8, 2012
    Messages:
    12,766
    Location:
    Texas
    I haven't looked them up, but they should be readily available at either the tire manufacturer's web site (most authoritative) or any online tire seller such as tirerack.com (most convenient but once in a while out of date).
     
  5. W8MM

    W8MM R1.5 #325 + Mdl S #01380

    Joined:
    Jan 5, 2007
    Messages:
    199
    Location:
    Cincinnati, USA
    The 19" Goodyear Eagle RS-A2 is rated as 440

    The 21" Continental Extreme Contact DW is rated 340 (other tire makers ratings in this size vary from 140 to 280)
     
  6. rlawson4

    rlawson4 Member

    Joined:
    Nov 24, 2011
    Messages:
    257
    Location:
    Atlanta Georgia
    Not as much difference as I was thinking. Okay so with ordinary driving how many miles should I expect. I am not a high performance driver.
     
  7. jerry33

    jerry33 S85 - VIN:P05130 - 3/2/13

    Joined:
    Mar 8, 2012
    Messages:
    12,766
    Location:
    Texas
    You can come very close by doing this:

    1. Look at the UTQG markings on your current tire.

    2. Figure out how many miles they are giving you.

    3. Divide the new tires UTQG value by your current tires UTQG value.

    4. Muliply the number from step 2 by the number in step 3.

    Example (values are for ease of calculation and do not represent any particular tire):

    Current tire UTQG 600

    50,000 miles before they are mostly worn out

    400 (new UTQG) / 600 = 0.667

    50000*0.667 = 33,350 expected miles on new tires.
     
  8. jerry33

    jerry33 S85 - VIN:P05130 - 3/2/13

    Joined:
    Mar 8, 2012
    Messages:
    12,766
    Location:
    Texas
    Note that after the originals wear off you can put on some Michelin Primacy MXM4 or Pilot Sport that both have a 500 rating.

     
  9. dsm363

    dsm363 Roadster + Sig Model S

    Joined:
    May 17, 2009
    Messages:
    18,235
    Location:
    Las Vegas, NV
    It sounds to me like you'd be happier with the 19" wheels. There are many more tires to choose from and they are all season tires instead of max performance summer tires. Good luck.
     
  10. rlawson4

    rlawson4 Member

    Joined:
    Nov 24, 2011
    Messages:
    257
    Location:
    Atlanta Georgia
    Thanks. I think so too.
     
  11. rlawson4

    rlawson4 Member

    Joined:
    Nov 24, 2011
    Messages:
    257
    Location:
    Atlanta Georgia
    Last Question ( I really appreciate all the answers), I check my tires on my Fusion Hybrid and they are Michelin Enery MXV4 S* with a "tread wear of 440." Is that the number to which people have referred? If so, I got about 45000 on them before I change them out for the same tire. If that's the number I would get similar life from the Goodyears and more than I thought from the continental's.
     
  12. dsm363

    dsm363 Roadster + Sig Model S

    Joined:
    May 17, 2009
    Messages:
    18,235
    Location:
    Las Vegas, NV
    That's the same number. The important thing is to get a tread depth gauge and to check your tires every month. Once it starts to get below 4/32 inch (according to tirerack.com at least) wet weather traction starts to decrease. 45,000 miles is a really long time to have tires on so that's good if you were able to get that much and still have enough tread depth. The tire compound and how the car is driven seem to be the biggest factors.
    Tire Tech Information - When Should I Replace My Tires?

    You have to remember that you may be tempted to gun the Model S a little more than the Fusion so that might affect tread wear.
     
  13. rlawson4

    rlawson4 Member

    Joined:
    Nov 24, 2011
    Messages:
    257
    Location:
    Atlanta Georgia
    Great point. The Fusion is not exactly a performance car. I love it but I drive it for mileage. Thanks again everyone. I appreciate it very much.
     
  14. mcornwell

    mcornwell Active Member

    Joined:
    Dec 20, 2010
    Messages:
    1,016
    Location:
    USA
    I believe it was reported that Tesla has changed the 21" tires to Michelins, as they gave better feedback than the Continentals.
     
  15. brianman

    brianman Burrito Founder

    Joined:
    Nov 10, 2011
    Messages:
    15,487
    If you can find the source, please share the link. Thanks in advance.

    FWIW, the Specs page still says Continental:
    Model S Specs and Standard Features | Tesla Motors
     
  16. Andrew Wolfe

    Andrew Wolfe Roadster 472 - S 440

    Joined:
    Jun 20, 2011
    Messages:
    573
    Location:
    Los Gatos, CA
    The test drive cars in Palo Alto had the Continentals. The showroom demo, the Michelins.
     
  17. SCW-Greg

    SCW-Greg Active Member

    Joined:
    Jun 13, 2012
    Messages:
    1,703
    Location:
    Beaverton, OR
    Does anyone know what the tire aspect ratio / dimensions are? For the 19 and the 21s? It would be good to shop the annual replacement costs would likely be on the 21s, vs. the longer wearing 19s.
     
  18. AndyM

    AndyM Member

    Joined:
    Apr 10, 2012
    Messages:
    661
    Location:
    Sherwood, OR, USA
    You're correct... mcornwall is right that Tesla changed - but they changed TO Continental, not FROM.
     
  19. AndyM

    AndyM Member

    Joined:
    Apr 10, 2012
    Messages:
    661
    Location:
    Sherwood, OR, USA
    It's on the specs page. See brianman's post just a couple of posts back for the link.
     
  20. SCW-Greg

    SCW-Greg Active Member

    Joined:
    Jun 13, 2012
    Messages:
    1,703
    Location:
    Beaverton, OR
    Excellent! Thanks.
     

Share This Page