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Arachnid Range impact

Discussion in 'Model S: Driving Dynamics' started by efusco, Apr 10, 2017.

  1. efusco

    efusco Moderator - Model S & X forums

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    I've driven on nothing buy the OEM 19" rims and tires for nearly 80k miles until my referral program 21" Arachnids were installed last Thursday. On Friday I drove over 180 miles to Kansas City, MO, so had a chance to see what sort of impact the new rims/tires would have. While this general issue has been discussed many times before in comparing 19" to 21" OEM rims, I hadn't seen it specific to the arachnids.

    While I can't give an exact percentage comparison, I can tell you that I didn't really see a measurable difference in energy efficiency/range.

    On the Trip up there is a slight (400') elevation decrease and winds were calm. Driving the speed limit I averaged ~282Wh/mi over the ~183 miles to the supercharger arriving with ~65 miles to spare after a 252 mile range charge.

    Coming home was a bit more sketchy as with the elevation gain I also had a stiff headwind or quartering headwind the entire drive and my energy efficiency was closer to 333Wh/mi. That leg is always less efficient than the Northbound trip. Also, I had started with only 240mi rated range and arrived home with about 25 miles of rated, again right at 183 miles total.

    Hoping this alleviates some of the anxiety I had before starting the trip for others making the switch.

    arachnid at supercharger.JPG
     
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  2. callmesam

    callmesam Member

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    If the tires are new, then you'll need a bit more data. But early results are encouraging.
     
  3. efusco

    efusco Moderator - Model S & X forums

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    Sure, but I would expect the efficiency to improve, not worsen, with tire wear. I'd love a side by side comparison--same day, temp, route, speed, etc.
     
  4. callmesam

    callmesam Member

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    Yes. Friction will be decreased on the tire edge, and efficiency will improve over the next 500-1000 miles.
     
  5. callmesam

    callmesam Member

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    BTW, the rims look incredible. Screw efficiency ;-)
     
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  6. efusco

    efusco Moderator - Model S & X forums

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    I just don't want them looking good on top of a flat bed when I can't make it to my destination!
     
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  7. DIL

    DIL Member

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    They look great. What about the noise? Is it much louder than 19's?
     
  8. efusco

    efusco Moderator - Model S & X forums

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    It's noticeable, but not severe, probably a slightly rougher ride as well, but again, not bothersome.
     
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  9. DIL

    DIL Member

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    hopefully *sportier* rather than just rougher
     
  10. jelloslug

    jelloslug Active Member

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    Do you happen to know the weight difference? That will tell all right there.
     
  11. bcampbelllds

    bcampbelllds Member

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    According to dragtimes, the Arachnid wheels weigh 51.85 lbs. That's rims and wheel. The stock 21's weigh 55.25 lbs.
     
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  12. FlatSix911

    FlatSix911 918 Hybrid

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    Interesting data. Can't wait to get my Arachnids mounted for summer driving :cool:
     
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  13. jelloslug

    jelloslug Active Member

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    How about the stock 19"s?
     
  14. efusco

    efusco Moderator - Model S & X forums

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    Ah, good info. Perhaps that explains the minimization of the range impact.About a lb. less per rim.
     
  15. efusco

    efusco Moderator - Model S & X forums

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    LOL! Ah, sure...sportier it is!
     
  16. SabrToothSqrl

    SabrToothSqrl Active Member

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    Y'all worried about range and I'm over here doing burnouts for fun... :)
     
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  17. SomeJoe7777

    SomeJoe7777 Marginally-Known Member

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    What tires and sizes did they install? What are the arachnid wheel sizes? (21x8.5? 21x9? 21x10?) Square setup or staggered?
     
  18. bcampbelllds

    bcampbelllds Member

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    I know the fronts are 245/35/21 and rears 265/35/21.
     
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  19. FlatSix911

    FlatSix911 918 Hybrid

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    Specifications:
    • 21″ Arachnid Wheel
    •Size: 21 X 8.5″ front,21 X 9.0″ rear.
    •Offset: +40 front, +40 rear
    •PCD: 5X120
    •Center Bore: 64.1mm
    •Lug Nut Spec: 13/16 Hex, 14X1.50 Thread
    •Lug Nut Torque Spec: 129 lb.-ft.
    •Weight: 26.5 lb. front, 28.5 lb. rear

    Package includes:
    • 4 Arachnid wheels
    • 4 Michelin Pilot Super Sport (PSS) tires
    • 4 tire pressure sensors
    • 4 Tesla logo wheel caps
     
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  20. Zooomer

    Zooomer Member

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    I have 19's, 20's, and 21's. The 19s have winter tires on stock rims. 20's are a forgeline with low resistance tires. The 21's are OZ Zues forged with contisilent staggered.

    I can say with absolute certainty that the determining factor is the tire, not so much the size, not so much the weight.
    My 20's allow me to be below 290w @65 consistently. P100DL. The 19's use a little more but not much. The 21's use A LOT more. They are terrible for efficiency. The 21" rims are the lightest of the 3. They were $1600/rim.
     
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