19" Tire questions

Thread starter #1
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2017 Regal GS AWD
Two questions,
1) How many miles are you guys getting out of the RSA's?

2) Have you guys put a different size on besides the stock 245/40 for the 19s.. I was thinking 255/40 or 245/45 or possibly even 255/45! But I think that may be pushing it.

Reason being, I like a little more meat to my tires.
 

MelsRegal

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Regal GS 2017
The 20" wheel uses a 255 so you have enough room to go to that width. You want to keep the tire diameter as close as possible to the original, 26.72" otherwise you will throw off the accuracy of the vehicle speed sensor which can effect other systems. A 225/40 is 27.03" and the 255/35 is 26.03". So the 255/40 is the closest to the original.
 
Thread starter #3
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8
Buick Ownership
2017 Regal GS AWD
The 20" wheel uses a 255 so you have enough room to go to that width. You want to keep the tire diameter as close as possible to the original, 26.72" otherwise you will throw off the accuracy of the vehicle speed sensor which can effect other systems. A 225/40 is 27.03" and the 255/35 is 26.03". So the 255/40 is the closest to the original.
Thanks man! May I ask what systems besides the odometer?
 

rodslinger

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14 Regal GS
I went about 36k on the original RSA tires and had about 5/32nds left when I swapped them. I also keep a near zero degree alignment on the toe for front and back to reduce wear and improve handling.

I went up to a 255-40R19 and have no issues. Going from a 245 to 255 is not much differant than going from new tires to bald tires from a diameter perspective and will not affect any systems on the car. Now if you went to something like a 255-40R19 on the back and kept the 245-40R19 on the front then you may see issues as the car will read different wheel speeds between the front and back tires which could affect the ABS, traction control or even the AWD system is you are so equipped.
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MikeC725

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Northville, MI
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2014 Regal GS AWD
Like MelsRegal says, try to stay as close as possible to the original size. But, here are your sidewall differences in those four sizes.........
245-40 = 3.85"
245-45 = 4.34"
255-40 = 4.02"
255-45 = 4.52"

If you want a little more sidewall, I don't see a problem going up to the 255/40/19. Most of us, for winter are running 18's. I have 245/45/18 that I run. With that I can tell a difference in the tire. If you stay with 19's and change to a 255/40, you probably will not notice a difference in the ride.
 

MikeC725

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Right now I've got about 34K on mine, they still look like they have a lot of tread left. & I can't wait to replace them. As I think they are loud and plain just don't like them. This was taken a couple weeks ago.

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buickman1

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16 Regal GS AWD
I personally run 235/45 Pirelli Sottozero3s on 19x8 enkeis for winters...1.1% larger overall if you are running 255/35-20 summer rubber. I wanted to go taller and narrower for snow.

On a side note, I just wore through my stock 2015 dated Pirellis in just over 22k miles, have Michelin PS4S arriving on Tuesday =]
 
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pigsnzen

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BFE, KY
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'12 GS 6MT
I run Michelin Pilot A/S 3+ tires in the stock 19" size. Not the best in snow, but acceptable for the light snow winters we get in KY. In rain/dry they're hands-down the best tire I've used - so much more grip than the RSAs and quiet to boot. Pricey, though. About a grand out the door from Costco.
 

beandip77

Buick Newbie
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Dallas, TX
Buick Ownership
2013 Buick Regal GS
I'm actually running 265/35/19s Extreme Contacts on my GS as of the last 3 months. Tires are fantastic.
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