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Model Y Performance 21" Tires - Larger, More Comfortable Fitment Details and Experience - Michelin AS4's (With Photos)
- Thread starter Raurele
- Start date
Interesting. I'm no alignment tech, it just seems weird that using the same exact wheel and a slightly larger tire would have any affect on that stuff.
I googled "tire width vs camber" and I saw the site it came from... I personally wouldn't trust them much, if at all.
Here's an article from a tire (and wheel) focused shop, TireRack. Zero mention of tire affecting alignment, but PLENTY of alignment affecting tires.
As for your other post to Destiny1701, I don't think that person was implying that the tire change caused camber issues, but that there were camber issues to begin with. Which is actually true, a number of people experience excessive where on the inside of the front tires because of the camber. I'm noticing it on my tires too and they're stock size.
One thing I think I'll add is, sometimes it is recommended to do an alignment when getting new tires. Not because of the tires themselves, but to make sure the car's suspension is in good condition (age/bumped/etc)... so you don't wear out the new tire prematurely.
Oh, here's an interesting post on some other forum... Relationship Between Tire/Wheel Size and Alignment. They mention how the tire affects "handling," rather than alignment.
edit: how about a link from a company that MAKES tires? Yokohama. They also don't mention tires affecting alignment, but do mention alignment affecting tires. I'm sure most, if not all tire makers will say the same thing on their own sites.
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I'm due for a replacement on my stock Pirelli's on the rear tires, but my front tires have plenty of tread left. Would there be an issue with ONLY replacing the rear tires with the 295/40/21 Michelin's you recommend? That is, until the front tires need replacing....
rogersmj
Member
So I've been trying to keep up with this thread and I see two primary variations in upsizing that people are doing. Trying to summarize:
Does that about sum it up?
I actually am not sure I've seen direct comments on ride quality from people who have done Option A (Upsize), but maybe I just missed it because sometimes I'm trying to piece together comments across multiple posts to figure out who did what. The Supersize folks have definitely made it clear it improved ride quality significantly.
| Stock | Option A ("Upsize") | Option B ("Supersize") | |
| Front | 255/35/21 | 275/35/21 (moved from OEM rear) | 265/40/21 |
| Rear | 275/35/21 | 295/35/21 | 295/40/21 |
| Notes | Increases sidewall height 0.27" and width 0.78" (rears) | Increases sidewall height 0.86" and width 0.78" (rears) | |
| Pros | 1. Better ride? 2. More "full"/square look on rims (less rubber band look) 3. Minimal (<1%) impact to speedo measurement | 1. Great ride? 2. Visual heft/fills out wheel wells | |
| Cons | 1. Ride isn't great 2. Tires look like rubber bands stretched over the rims | 1. $$ | 1. Significant (6%) speedo inaccuracy (reading 70 = 74.2) 2. $$$$ |
Does that about sum it up?
I actually am not sure I've seen direct comments on ride quality from people who have done Option A (Upsize), but maybe I just missed it because sometimes I'm trying to piece together comments across multiple posts to figure out who did what. The Supersize folks have definitely made it clear it improved ride quality significantly.
Hi everyone. I posted some tire questions earlier in this thread and received some very helpful responses. Now I have finally taken the step to swap out the gemini wheels with some second hand uberturbines for my MYLR. I was afraid it would not look as good as it does ok the MYP but I must say that it looks really good from my side (higher suspension).
I moved the OEM rear pirellis to the front and bought two new rear tires also from Pirelli but not the elect version as they were quite a bit more expensive than the “audi” specific tires that were on sale.
Comparing to the geminis with hankook ventus 255/45/19 tires I feel like the the car car has much better grip now. I will probably give up some range but not too important for me in the everyday. I intend to install winter tires on the old gemini.
Overall vey happy with the outcome and thanks to everyone who contributed in this thread.
tires now: Pirelli pz4 p-zero 275/35/r21 and pirelli p-zero 295/35/r21.
Car: model y long range (no modifications done - just installed wheels)
First picture shows my car in the background and my friend’s car with gemini in the front for comparison.
I moved the OEM rear pirellis to the front and bought two new rear tires also from Pirelli but not the elect version as they were quite a bit more expensive than the “audi” specific tires that were on sale.
Comparing to the geminis with hankook ventus 255/45/19 tires I feel like the the car car has much better grip now. I will probably give up some range but not too important for me in the everyday. I intend to install winter tires on the old gemini.
Overall vey happy with the outcome and thanks to everyone who contributed in this thread.
tires now: Pirelli pz4 p-zero 275/35/r21 and pirelli p-zero 295/35/r21.
Car: model y long range (no modifications done - just installed wheels)
First picture shows my car in the background and my friend’s car with gemini in the front for comparison.
OP here. The front can’t be wider than 265 if you’re going 40 sidewall. They will rub when going into a shopping center or raised driveway when turned all the way unless you’re going extremely slow. It's either 275/35 or 265/40 for the front. I’d rather have the larger sidewall for the better ride quality. 265/40 has never rubbed for me even when hitting bumps faster than I should when turning.
This is what I want to know as well. The differential between the 275 and the 295 is the same as the stock 255 F 275R….
I examine my MYLR and see the steering knuckle as the ONLY reason a 275/40-21 or a 275/45-20 wouldn’t work.
Anyone that can shed some like on that 275/40-21 on the Performance? (That’s the same diameter as the 275/45-20 I want to put on my MYLR.
Thanks in advance.
Because 275/40s will rub. There is discussion about 275/35r21s and 275/40r21s. One fits, the other doesn't.
Do you have experience that the 275/40-21 will fit up front? Does is clear the steering knuckle?
Where do they rub? Steering Knuckle? Or? Thanks in advance. Great to get a reply on this. I haven’t seen anyone say they don’t fit…although I’ve read every page of this thread…
Strange. Unless I'm overlooking something, it's been mentioned several times, including this page.
"OP here. The front can’t be wider than 265 if you’re going 40 sidewall. They will rub when going into a shopping center or raised driveway when turned all the way unless you’re going extremely slow. It's either 275/35 or 265/40 for the front. I’d rather have the larger sidewall for the better ride quality. 265/40 has never rubbed for me even when hitting bumps faster than I should when turning."
Hi TwistyTony,
In reply to your question, I am running Michelin P4S SUV's on Uberturbines 21" on a RWD Model Y, fronts 275/40R21 and rears 315/35R21, also have a Mountain Pass Suspension Lift Kit installed and only way to prevent rubbing on the steering knuckle was by using a 3mm spacer at the front wheels. Not sure if this setup would work without the lift kit, ride is incredibly good and rear tires look really cool at 315. Hope this helps.
In reply to your question, I am running Michelin P4S SUV's on Uberturbines 21" on a RWD Model Y, fronts 275/40R21 and rears 315/35R21, also have a Mountain Pass Suspension Lift Kit installed and only way to prevent rubbing on the steering knuckle was by using a 3mm spacer at the front wheels. Not sure if this setup would work without the lift kit, ride is incredibly good and rear tires look really cool at 315. Hope this helps.
I just purchased 275 45 r20 for the front and 295 45 r20 for the read since my Model Y LR came with 20” rims. Seems that if you convert the radius of a 20” rim to mm you will get 1/2 of 20” which is 10” since you’re only concerned about the measurement from the center of the rim to the end which is 254mm + 45mm (height of the tire) = 299mm a 9.5 wide rim. I wanted to compare this clearance to the 275 40 r21
As for the 21 inch wheel with a 40mm Tire height you get (10.5 “ converted to 266.7mm + 40mm = 306.7) as I was concerned about the front rubbing on the knuckle.
Seems like I have more than 6mm before any rubbing can happen hopefully.
As for the 21 inch wheel with a 40mm Tire height you get (10.5 “ converted to 266.7mm + 40mm = 306.7) as I was concerned about the front rubbing on the knuckle.
Seems like I have more than 6mm before any rubbing can happen hopefully.
Your math is a bit off, probably because you're misunderstanding the numbers for the tire size.
275/45/20 doesn't mean the 45 is the height of the tire in mm. It means the height of the tire is 45% of the section width, in this case 275.
So the tire height is actually 275 x 0.45 = 123.75 mm for the front and 132.75 (296x0.45) for the rear. For the 21", it's 110.
Meaning, it's actually about 378 vs 377.
Your new purchase is going to be about 2" bigger in diameter than the factory setup in front and even more in back. Have fun!
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