265/40/18 on the aero wheels? Anybody have a pic?

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lemketron

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#22
I strongly considered, but didn't want to go with the 255 options. The 255 40 is smaller outside diameter, and the 255 45 was larger and had a significantly higher rotational moment of inertia compared to stock (based on simplified calculations).
I assume that means it would negatively impact acceleration?

I'm considering the 245/45 Michelin PS4S. It's only about 1.5% larger (+1mph at 65mph) vs 2.7% for the 255/45, so I'm hoping that any impact on performance (or range) would be minimal...?
 

JeffC

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#23
I assume that means it would negatively impact acceleration?

I'm considering the 245/45 Michelin PS4S. It's only about 1.5% larger (+1mph at 65mph) vs 2.7% for the 255/45, so I'm hoping that any impact on performance (or range) would be minimal...?
Yes, a heavier and/or taller tire will use more energy and could be slower accelerating because of it, though the friction characteristcs of the tire on a specific surface also matter for acceleration in any given direction.

A bigger issue may be that performance oriented tires like the 4S may be less efficient than the Primacy due to design differences. The latter is designed to use less energy. The latter is designed to stick better. So be aware that there is a tradeoff between range and performance when choosing different types of tires. This is reflected in the range/energy results for the different factory tires/wheels in Model 3.
 

lemketron

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#24
A bigger issue may be that performance oriented tires like the 4S may be less efficient than the Primacy due to design differences. The latter is designed to use less energy. The latter is designed to stick better. So be aware that there is a tradeoff between range and performance when choosing different types of tires. This is reflected in the range/energy results for the different factory tires/wheels in Model 3.
Absolutely. The tricky part is just not knowing, and feeling like I can't be the first one to try it (though admittedly there probably aren't that many people who are both nearly finished with the OEM Primacy tires, and considering switching to the PS4S and especially in a larger size.

I went through this same struggle with a 2011 LEAF, replacing the Bridgestone Ecopias with stickier Michelins. It took a big hit on range but the 2011 LEAF didn't have much to begin with. When my wife took over that car we went back to Ecopias to improve the range.

However, now with the LR3RWD, I have 300+ miles of range, and aside from it being nice to be able to drive from the Bay Area to Santa Barbara without stopping, I can afford to give up a little range to see how the summer tires compare to the OEM A/S. Plus Michelin gives you 30 days satisfaction guarantee so if the new ones are really disappointing in some way, I can always go back to the Primacy (or maybe PS4S in the original size).

I just wish there was some way to get a better idea of what to expect up front... Otherwise, it's ~$1000 gamble, and takes a year or two to run them out before it's practical to try again.
 

JeffC

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#25
Absolutely. The tricky part is just not knowing, and feeling like I can't be the first one to try it (though admittedly there probably aren't that many people who are both nearly finished with the OEM Primacy tires, and considering switching to the PS4S and especially in a larger size.

I went through this same struggle with a 2011 LEAF, replacing the Bridgestone Ecopias with stickier Michelins. It took a big hit on range but the 2011 LEAF didn't have much to begin with. When my wife took over that car we went back to Ecopias to improve the range.

However, now with the LR3RWD, I have 300+ miles of range, and aside from it being nice to be able to drive from the Bay Area to Santa Barbara without stopping, I can afford to give up a little range to see how the summer tires compare to the OEM A/S. Plus Michelin gives you 30 days satisfaction guarantee so if the new ones are really disappointing in some way, I can always go back to the Primacy (or maybe PS4S in the original size).

I just wish there was some way to get a better idea of what to expect up front... Otherwise, it's ~$1000 gamble, and takes a year or two to run them out before it's practical to try again.
The Pilot Sport 4S is arguably the best street performance tire available today. No, it's not a soft compound track/race tire, but it has an excellent combination of feel, grip, predictablity, efficiency, etc. If you haven't tried it on a Model 3 Performance test drive, you're welcome to drive mine when the roads dry eventually. (My car is totally stock Performance Upgrade option currently.)

For a street tire, the 4S sticks like glue and also wears very well. The Primacy, not so much. But 99% of the time, I am not cornering or braking at 1g, and the performance tires are sort of a penalty for their lower efficiency. Of course it's nice to be able to push the car a little occasionally when there's no one around.

TBH I'd prefer the Aero wheels and Primacy tires for road trips if they would fit over the rear performance brakes, but they don't. Having say 5-10% better range/efficiency on road trips in particular is a sigificant benefit.

Consider getting a different set of aftermarket wheels to put the 4S on. That way you can also go wider if you like. (And of course note that wider tires also have lower efficiency due to slightly greater aerodynamic drag due to greater frontal area.) That said, the Aero wheel is a significant advantage for its low drag, so I can see the attraction of keeping it.
 
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#26
Hi folks, new member and about to be new owner of red/black LR AWD Model 3 arriving this Saturday !!!.

My current SCCA autocross car is 2010 Subaru STI, which has 18 x 8.5 rims. Over the last 9 years, I've run 265/35/18 Falken Azenis and Dunlop Starspec I, II, & IIs on those 8.5 wide rims all around with no issues. Looks good too. Just need to be careful picking wheel offset to maintain clearance with suspension strut/shock and fender lip.

While the section width of each tire brand/model is different, for a generic tire, 265 versus 235, it's only 9/16" wider on both inside & outside. If Model 3's have at least that much clearance plus a bit more to account for tire flex when cornering, it should be fine on stock rims. For my Model 3, I plan on using the STI's current 265/40/18 Azenis when I autocross it.

FYI - the last Washington DC Region SCCA event had three Model 3 running (1 Performance, 2 AWD); they ran well, competitive in their classes. The non-performance Model 3 is in the same class as the STI's and beat me by 1.5 seconds.

- Harry
 
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#27
Just had my autocross tires, 265/35/18 Falken Azenis I mentioned above, mounted on the stock 18" Aero rims. They fit fine, lots of clearance to front strut, gobs of room in the back.

On the street, the car handles better, with much better initial turn in and cornering & braking. W/Mile is up by 10 - 15%. Tire noise is definitely noticeable, mostly because of the camber wear from previous year's worth of autocrosses on those tires.

Autocrossed the Tesla on these tires last weekend, a lot more fun with sticky tires! Asked one of the nationally competitive drivers to take a run in the car - he was within 2/10 of winning the class, with no experience in the car and with 2nd tier tires (Azenis are not the best performance tires; RE-71R or Rivals are the top tier, about 1.5 sec faster on 60 sec course), so looks like the Model3 AWD will be very competitive in my class, as soon as I don't suck at driving.

Pix (think the wider tire looks better than stock):
 

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#28
Just had my autocross tires, 265/35/18 Falken Azenis I mentioned above, mounted on the stock 18" Aero rims. They fit fine, lots of clearance to front strut, gobs of room in the back.

On the street, the car handles better, with much better initial turn in and cornering & braking. W/Mile is up by 10 - 15%. Tire noise is definitely noticeable, mostly because of the camber wear from previous year's worth of autocrosses on those tires.

Autocrossed the Tesla on these tires last weekend, a lot more fun with sticky tires! Asked one of the nationally competitive drivers to take a run in the car - he was within 2/10 of winning the class, with no experience in the car and with 2nd tier tires (Azenis are not the best performance tires; RE-71R or Rivals are the top tier, about 1.5 sec faster on 60 sec course), so looks like the Model3 AWD will be very competitive in my class, as soon as I don't suck at driving.

Pix (think the wider tire looks better than stock):
Thanks for the info! I'm going to soon install 265/40/18 on factory aeros. I have 3mm and 5mm spacers just in case the front does not clear. Compared to your 265/35/18 tires, is there still room in the front for my 265/40/18 tires? Or will I need a spacer?
 
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#30
Thanks for the info! I'm going to soon install 265/40/18 on factory aeros. I have 3mm and 5mm spacers just in case the front does not clear. Compared to your 265/35/18 tires, is there still room in the front for my 265/40/18 tires? Or will I need a spacer?
Sorry for the late reply but the 265/35/18 tires fit fine, no rubbing on stock 18" rims without any spacers.

- Harry
 
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#31
20K miles and my rear tires are totally bald already.
Time to look for new tires.
I don't like the stock 235/45/18 on my aero rims because they are just too easy to get curb rashes.
But I want to keep the rims for the same ride comfort.
And I don't want to mess up the diameter. I have a feeling model 3 does a lot of computing based on the wheel rotation - GPS, torque, whatever.
In the screen setting, they have tire setting for 18", 19" and 20" wheels. Stock 18" tire have 669mm OD. Stock 19" has 671mm. Stock 20" has 673mm.
As long as my new wider tires have 669, 671 or 673mm and I choose the right one in the setting, I would not mess up the computing.
With 18" rims, the only choice is 265/40/18 as 669mm OD. There is no other choices for 671mm or 673mm.

https://www.tyresizecalculator.com/charts/tire-size-chart-metric-by-rim-wheel-diameter

Now, the question is... has anyone installed 265/40/18 tires on aero rims? Does it rub? Is the range affected?
Spacers needed? If so, what size?
What brand and model? I don't want to change them in another 20k miles.
 

Rick Steinwand

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#32
Years ago I went one inch wider on my '12 Volt and loved the traction, but despite being a LRR Michelin, definitely lost 10 miles of range.

I too would prefer a wider tire to curb curb-rash. I run winter tires for half the year and only have 8k on the car and they seem to be half tread already.
 
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#35
Reporting back...
I took the 3 to America's Tire and asked them to install a pair of 265/40/18 in the front. They said it rubbed and switched them to them back which is then fine.
So, 265/40/18 cannot fit in the front. I guess I will do staggered then.
 

garsh

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#36
I took the 3 to America's Tire and asked them to install a pair of 265/40/18 in the front. They said it rubbed and switched them to them back which is then fine.
So, 265/40/18 cannot fit in the front. I guess I will do staggered then.
That's a shame. I wonder what part rubbed. monkeyracer was able to mount 265/40R18 on his Model 3. It looks great! Different tires will still be slightly different in size, even if they have the same official size.

Well, I ended up getting an awesome deal on a set of konig 18x9 rims, and it was easier to sell the stock wheels as a full set with tires.

View attachment 15443 View attachment 15444
These are 18x9 +40 Konig Rennform flow forged rims with 265/40ZR18 Continental ExtremeContact DWS06 tires. Ended up being a few pounds per corner lighter than the stock set up.
The tire bulge is good, and these would probably have worked on the stock rims just fine, but in the end I wanted something different than the aero wheels, and something that if I needed to pursue warranty on, was within the recommended range.
 
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#37
Right. I have been researching to find anyone who has 265/40R80 on stock 18" aero wheels.
So far, I see:
265/40/18 fit great, no clearance or spacers needed.
Then:
Thanks for the info! I'm going to soon install 265/40/18 on factory aeros. I have 3mm and 5mm spacers just in case the front does not clear. Compared to your 265/35/18 tires, is there still room in the front for my 265/40/18 tires? Or will I need a spacer?
But no confirmation.

monkeyracer has konig 18x9 rims. The stock rim is 18x8.5. Even both have offset +40, maybe the 9" width vs 8.5" makes a difference for the front?
I guess what I can do is to swap the 265/40/80 to the front to see if it is rubbing. I believe it does because when I told America's Tire to put the 265 to the front, it is extra work if they have to end up putting them in the rear.

Oh well, anyone has 265/40/18 on all four stock 18" aero rims? Can you please confirm it is not rubbing? And if possible show some pics?

I can confirm 265/40/18 in the rear is all good.
 

garsh

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#38
monkeyracer has konig 18x9 rims. The stock rim is 18x8.5. Even both have offset +40, maybe the 9" width vs 8.5" makes a difference for the front?
It's probably due more to differences in the tire sizes despite having the same 265/40R18 size, due to being a different make/model. Given that the wheel offsets are the same, the tread shoulders should be at the exact same positions regardless of which wheel it's mounted on - the only real difference should be the stretch of the shoulders down to the rim.

I'm really curious to see where your tire is rubbing on the front. I wonder if it's slight enough that a very small spacer would alleviate the problem.
 
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#39
Right. I just googled and learned more about what offset it.
It really could be just the tires. I have Yokohama ADVAN Sport A/S.
Well, no plan to swap the tires just to see for now. I will do that when the front original tires need replacement and I will report back because, by then, I will need to decide if I have all 4 265s or do the staggered setup, or get small spacers (which I hope would not mess up the steering geometry, autopilot, etc of the car.)

Again, I want 265/40/18 because it is the only 18" tire that has the same diameter of the 235/45/18.

It is for my wife. She is just a daily driver.

img_20191021_175820-jpg.30083
 
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#40
Alrighty... So let me answer the unanswerable. I don't always check the forums but I installed the tires a few weeks ago. I got 265/40/18 Hankook EVO2 V12 square and it fits PERFECTLY FINE. I put them on and checked for clearance myself. The shop only mounted the tires. There's an obvious bulge but it looks fine IMO, and helps fill up the wheel well too.
 

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