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2.0 / 2.5 Roadster / Roadster Sport Tire Thread

Discussion in 'Roadster 2008-2012' started by suxxer, Jan 1, 2011.

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  1. strider

    strider Active Member

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    I don't know. I have a non-Sport, running the "Eco" (higher) pressures, and use my car almost 100% heavy commuting. Wife had a baby soon after I got my car so haven't done any sport driving save giving people rides at work.
     
  2. Doug_G

    Doug_G Lead Moderator

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    I asked my Tesla Ranger for an opinion. He's had some track experience.

    So it sounds like the T1R's would be a good choice. But he's saying I shouldn't mix AD07 front and T1R rear. So that means taking off perfectly good fronts, or sticking with AD07's until my front tires wear out.

    Any thoughts?
     
  3. dpeilow

    dpeilow Moderator

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    If you put new on the back, haven't you got different diameters and amounts of expansion anyway?
     
  4. Doug_G

    Doug_G Lead Moderator

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    When you switch tires there's a special mode for retraining it for the tire diameter. I believe there's also a long-term correction feature, as VFX said his 1.5 didn't have the learn tires command, but it adapts over time.

    I think my Ranger was more concerned that the mixed brand tires would be made of different materials, which could therefore expand differently as they warm up.
     
  5. vfx

    vfx Well-Known Member

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    Not me. I have only replaced with Tesla spec A07s to date.
     
  6. Doug_G

    Doug_G Lead Moderator

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    I stand corrected. Someone said that.
     
  7. Alan

    Alan Member

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  8. Doug_G

    Doug_G Lead Moderator

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    This morning I went ahead and switched over to Toyo Proxes T1R on all four wheels. The rear AD07's were even worse than I thought, but the fronts had lots of wear left so I kept them for possible future use. Or maybe someone else will want them...

    My first impression is that handling, acceleration, and tire noise are all good. No complaints. We'll see if they wear a little better.
     
  9. dsm363

    dsm363 Roadster + Sig Model S

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    I called Yokohama. They have no plans to produce the AD08 front tires in the same size as the AD07s so that won't work unless you get a wider tire or mix tires. I wish they'd make the AD08s in the correct size.
     
  10. TEG

    TEG Teslafanatic

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    See if you notice any different in range too. People are reporting some reduced range having had their Roadsters for a while, and tend to attribute it to the battery pack or firmware changes, but tire changes could be a factor too. One of the "claims to fame" for the AD07 was low rolling resistance.
     
  11. tennis_trs

    tennis_trs 2010 2.0 Roadster Sport

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    I believe that most/all of the comments I've seen about reduced range have referred to reduced Ideal Range indicated at the end of a charge, instead of referring to actual range that they believed they would get. But knowing specific range differences due to any types of changes (different tires, inflation, temperatures, speeds, etc.) are interesting.
     
  12. TEG

    TEG Teslafanatic

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    Could ideal range get automatically revised downwards over time if the car computers noticed that wh/mi was higher than before?

    Does ideal range take into account any readings from the car history or is it just a simple calculation based entirely on pack SOC?
     
  13. tennis_trs

    tennis_trs 2010 2.0 Roadster Sport

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    I thought that what I'd read seemed to indicate that people thought (*) that the ideal range was essentially based on how much energy the car thought it could get out of the pack used in some simple calculation that didn't learn from driving, but that could obviously change (firmware), if it was even true.

    (*) I know I should question conclusions not directly supported by information from Tesla.
     
  14. SByer

    SByer '08 #383

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    Hmm. I don't have references to post here, and searching didn't help, but I seemed to remember that early on we had enough evidence that there was a small portion of the 'ideal range' that was based on driving history. I'm tempted to spend a week pursuing additional data ;-). It's been so long...
     
  15. donauker

    donauker Member

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    I don't have references either, but it is my understanding that ideal range is strictly a calculation based on pack capacity using approximately 225 Wh/mile. When using more energy per mile ideal miles will decline quicker then actual miles driven.

    With my snow tires on this winter I have never gotten close to either the 225 Wh/mi or ideal range.
     
  16. Talkredius

    Talkredius Member

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    no, ideal range represents in a way the SOC. Ideal Range = SOC * xy wh/mi . xy is unknown to me but from my experience on flat streets it should be the power consumption at a speed of 80 ... 90 km/h with top on.

    The estimated range takes the readings from the last 40 mi into account, but I would never rely on this. Not because it is inaccurate but because it might lead to wrong conclusions. E.g. after slipstreaming behind a truck for a while you est. range might be higher than the ideal range, but as soon as the truck leaves the autobahn this "extra range" melts like snow in the summer.

    For travelling long distance I try to keep my actual distance to the target below the ideal range in standard mode. If this isn't possible I always look for a charging station on my way.

    If you are in a region with high mountains I would reduce the ideal range by 20 %, but I never tested this. (lack of high montains were I live)
     
  17. Eberhard

    Eberhard #421 Model S #S32

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    back to the topic:

    does someone has real life experience with TOYO TR-1 tires?
     
  18. Doug_G

    Doug_G Lead Moderator

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    Yes, I just switched to T1R tires. So far they're great. Give me a couple of weeks and I'll let you know if I notice anything different.
     
  19. Nvbob

    Nvbob Roadster 1256

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    Doug_G what size did you use for the fronts?
     
  20. Doug_G

    Doug_G Lead Moderator

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    Front Toyo Proxes T1R 195/50R16 84V part# 245740

    Rear Toyo Proxes T1R 225/45R17 94Y RD part# 245600
     

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