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19” Wheel Largest Tire Size?

Discussion in 'Model 3' started by spesler, Jul 21, 2018.

  1. spesler

    spesler Member

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    Sorry if this is in the wrong location or has already been addressed.

    On my past few cars (328i, 135i, 350z) I have gotten into the habit of keeping the factory wheels and installing slightly wider tires (usually Michelin PSS in a +10mm width).

    It appears that the Model 3 has power to spare and is (severely?) tire-limited. The 135i was that way. Has anyone tried to max out the stock 19” wheels?
     
  2. gilscales

    gilscales Member

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    #2 gilscales, Jul 21, 2018
    Last edited: Jul 21, 2018
    there are really only 2 options without exceeding manufactures guidelines on the width 245/40/19 or 255/35/19 and they are either larger or smaller in diameter, if you did not mind ballooning the tire a bit on an 8.5" wheel (not recommended) the the 265/35/19 is the same diameter, there is an owner in Maui that put 18 x 9.5 lightweight wheels on with the 265/35/19 and said he has not had issues with rubbing (range on hwy would be a big hit though)

    Wheel Offset Calculator

    Here are the specs to the tire sizes in a P4S Michelin

    https://www.michelinman.com/upload/michelin_us/specifications/specs-pilot-sport-4s.pdf

    My last car was a 2013 VW Passat TDI and it came stock with 235/45/18, I changed them to 245/45/18 and really liked the difference in handling, the tires are rated for a heavier load and also rode a little more comfortable with just a tad more sidewall, did not seem to take a hit in mpg so I am guessing might not be a lot different on the 3, I plan on getting the 245/40/19 size when mine wear out.
     
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  3. Knightshade

    Knightshade Active Member

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    I was hoping to swap 265/40-18s onto the stock aeros since they'd match stock diameter (and your comment on the guy with 265 19s suggests this won't have rubbing issues either on the stock 8.5 wide 18s)

    Just curious if you know how to quantify range hit difference with wider tires?
     
  4. spesler

    spesler Member

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    @gilscales That pretty much answers it. Thanks for the links.
     
  5. gilscales

    gilscales Member

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    Just from reading here where someone went with a larger wheel and tire combo and the went from a 250 wh/m to a 320
     
  6. Zoomit

    Zoomit Member

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    Remember, you’re likely going to be running tires with more aggressive compound so the hit will be a combination of tire compound and width. It could easily be 5-15% hit.
     
  7. Lobstahz

    Lobstahz Member

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    I too plan on going up from the standard 235/40/19 tire size to 245/40/19 at least and thinking of 255/40/19, as I'd like the extra rim protection. Does anyone have experience or photos of the Model 3 on 19" tires with 245 or 255mm tires? As I can't decide between these 2 sizes.

    • I'm planning on getting 19" TST rims and am trying to figure out what tire size I ultimately want to go with. Internal clearance doesn't seem to be an issue as "265" was stated as the limit in this thread Get Your Wheels Aftermarket Wheels.
    • Wider tires should help to fill out the wheel wells a bit more, and hopefully can allow me to avoid using spacers to bring the wheel closer 'out'.
    • All together with the 19" TST rim (+35mm offset; so 5mm further 'out' than stock) and a 255mm tire would be .55" (14mm) closer to the fender. 15mm is what people are stating is a safe target for spacers (Get Your Wheels Aftermarket Wheels) so this seems fine.
    • Obviously wider tires will reduce range. I'm not super concerned about this, I'm prioritizing style, and hopefully some performance, over range.
    • I've tried to calculate/math my way out of this problem, but I think I just need to see options and hear some other people's opinions. So please share if you have them!

    These are the tires I'm comparing, and Michelin doesn't make this tire in 235/40/19 so that's a non-starter. Have 255/35/19 on there for comparison, but that's "too thin" of a sidewall and not worth it for me.
    upload_2018-8-6_19-52-43.png

    OEM 19" compared with 19" TST and 255mm tire
    upload_2018-8-6_19-51-14.png

    OEM 19" compared with 19" TST and 245mm upload_2018-8-6_19-50-18.png

    Tire stats taken from tirerack.com. Offsets and wheel size comparisons from Wheel Offset Calculator
     
  8. pdxrunr

    pdxrunr Member

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    Here is what I'm doing on my P3D based on recommendations from my favorite place in town, 503 Motoring. I'm going middle of the road on size/comfort with the 19" wheels, but staggered for more aggressive look and wider tires for max traction.

    19X8.5 ET35 Avant Garde M652 Wheels - in Brushed Antique Copper faces with Gloss Black Barrels

    19X9.5 ET40 Avant Garde M652 Wheels - in Brushed Antique Copper faces with Gloss Black Barrels

    (Car is black)

    245/40/19, 275/35/19

    Michelin Pilot Sport A/S 3+ Ultra High Performance All-Season

    and possibly

    Michelin Pilot 4S Max Performance Summer Tires

    in the summers!
     
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  9. SomeJoe7777

    SomeJoe7777 Marginally-Known Member

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    Maximum recommended tire width on the stock 18x8.5 (Aero) or 19x8.5 (Sport) wheels is 255.

    As Lobstahz stated, on the Aeros this means you can fit 255/35R18 with a -1.6% speedometer error, or 255/40R18 with a +2.4% speedometer error.

    On the 19" sport wheels, you can fit 255/35R19 with a -1.5% speedometer error or a 255/40R19 with a +2.3% speedometer error.

    If you want to go to 265 or higher width tires, you need wider wheels.
     
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  10. pdxrunr

    pdxrunr Member

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    Hence the 19x9.5 wheel on the rear. What do you think is the max width on that size wheel?
     
  11. SomeJoe7777

    SomeJoe7777 Marginally-Known Member

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    Max recommended tire width on a 19x9.5 wheel would be a 275.

    You can then fit a 275/35R19 tire on that wheel with +0.8% speedometer error. Be aware that to clear suspension components, you may need to drop to a +35 offset vice the stock +40. Wheels will stick out an additional 18mm, tire will stick out an additional 25mm.
     
  12. Knightshade

    Knightshade Active Member

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    Lots of folks run 265 on 8.5 rims you can usually go 0.5 above or below recommended rim width for a given tire

    The only question would be if 265 will rub in the front or not (since square wheels are better all else being equal)
     
  13. gilscales

    gilscales Member

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  14. SomeJoe7777

    SomeJoe7777 Marginally-Known Member

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    I usually use the following web site when determining what tires can fit on what wheels:

    Tyre Size for Rim Size/Width Calculator - What's the best tyre size for my rim?

    It's probably a bit conservative. However, while a 265 on an 8.5" or a 285 on a 9.5" can surely fit, and probably can be considered "safe", the question is whether the tire will perform optimally. That may be debatable.
     
  15. gilscales

    gilscales Member

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    Going by Michelin’s recommendations they do not advise a 265 on 8.5” wheel but say 9” for a 275 is fine but as you say it is probably not optimal
     
  16. Knightshade

    Knightshade Active Member

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    Possibly not optimal but I’d bet the 30mm of extra width adds more performance benefit than the tire being slightly stretched past official spec removes- and 235 and 265 are your only choices if sticking to the stock rims and wanting stock total diameter

    Plus more rim protection from curbs with the 265s
     
  17. insaneoctane

    insaneoctane Active Member

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    #17 insaneoctane, Aug 7, 2018
    Last edited: Aug 7, 2018
    I hate that the 18" rims protrude beyond the tire.... I really like the idea of 265/40R18 which is the exact same diameter. I just need someone else to do it first! ;) while I suspect it will work fine, there's always a question of liability in an accident too.

    Anyone know if 255s would still extend beyond the rim?

    Does Tesla calibrate speedo in any way?
     
  18. 240W

    240W Member

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    I think 255 should be ok

    I do wonder about it re-calibrating speedo, I mean, stock 18 and stock 19 are close but not exact, so one of them is off, haha
     
  19. Sg911

    Sg911 Member

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    Will staggered wheels help on an all wheel
    Drive platform or is square best?- I am
    Thinking 18”s, maybe 9” wide on 265’s ...
     
  20. Knightshade

    Knightshade Active Member

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    Square

    Staggered is fine for drag racing and rwd but introduces more understeer, something you certainly don’t want on a well balanced AWD car
     
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