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Discussion Starter · #1 ·
ok guys i'm about to pull the trigger on a 2015 Q50 rwd that currently has oem 17" wheels on it. well, i really like the look of the 19" rays wheels. so, i was perusing a popular selling site and found a decent deal on some 20x9 rays wheels with +45 offset i believe. would those fit the Q50 well and clear the brakes and such w/o mods? also, i'd like to run a square setup and not a staggered so i can get more life outta the tires. what would be the size tire i'd need to go with providing the 20x9 rays fit the car well.
regards,
Big Ed
 

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19x9+45 will fit all day long and twice on Sunday, send it.

245/40/19 for the cali vape lord stretch

265/35/19 for ideal fitment.

275/35/19 for what many OEMs use for a 9" wide wheel.
 

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Thanks for that bud. But, what about the 20x9 that was on the Q60. Still the same +45 offset.
Big Ed
+45 will work, so will +40 for a 9" wheel.

for tires, just drop 5% in aspect ratio to maintain oem tire diameter (+/- .1"). 265/35/19 = 265/30/20
 
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Discussion Starter · #6 ·
sorry fellas i was a touch wrong in my description. the rays wheel were oem for a q70 and are 20x9 with +43 offset. so, again will that work with a 2015 q50 premium rwd? and again what size tires to keep speedometer correct reading please?
Big Ed
 

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sorry fellas i was a touch wrong in my description. the rays wheel were oem for a q70 and are 20x9 with +43 offset. so, again will that work with a 2015 q50 premium rwd? and again what size tires to keep speedometer correct reading please?
Big Ed
still ok to use, no problems.

255/35/20 is ever so slightly taller than stock by .3" in diameter, 27.0" vs 26.7". you would read approx. 1mph slow at 70mph. 70mph indicated, 71mph actual.

265/30/20 is slightly shorter by .4" in diameter. at 70mph indicated, you could actually be traveling 69mph (nice).

275/30/20 is ever so slightly shorter than stock by .2" in diameter. speedo error is minimal, less than .5mph at 70mph. 275 is about the limit of what you should use on a 9" wide wheel but its within pretty much any mfg's recommendation for a 275. ive included a pic of an audi using a 275/30/20 on oem 20x9s.
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Discussion Starter · #8 ·
still ok to use, no problems.

255/35/20 is ever so slightly taller than stock by .3" in diameter, 27.0" vs 26.7". you would read approx. 1mph slow at 70mph. 70mph indicated, 71mph actual.

265/30/20 is slightly shorter by .4" in diameter. at 70mph indicated, you could actually be traveling 69mph (nice).

275/30/20 is ever so slightly shorter than stock by .2" in diameter. speedo error is minimal, less than .5mph at 70mph. 275 is about the limit of what you should use on a 9" wide wheel but its within pretty much any mfg's recommendation for a 275. ive included a pic of an audi using a 275/30/20 on oem 20x9s. View attachment 108265
thanks blitz for the detailed info bud. so, could i run that size tire in a square setup?
thanks again bro,
Big Ed
 

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Discussion Starter · #10 ·
still ok to use, no problems.

255/35/20 is ever so slightly taller than stock by .3" in diameter, 27.0" vs 26.7". you would read approx. 1mph slow at 70mph. 70mph indicated, 71mph actual.

265/30/20 is slightly shorter by .4" in diameter. at 70mph indicated, you could actually be traveling 69mph (nice).

275/30/20 is ever so slightly shorter than stock by .2" in diameter. speedo error is minimal, less than .5mph at 70mph. 275 is about the limit of what you should use on a 9" wide wheel but its within pretty much any mfg's recommendation for a 275. ive included a pic of an audi using a 275/30/20 on oem 20x9s. View attachment 108265
so, do you think the 255/35r20 would fit under the 2015 q50 rwd without rubbing or sticking out too far? i like the look of the audi in the pic but don't wanna stretch em. sorry for all the ???. but, if imma buy these wheels i need to get on it lol..
Big Ed
 

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No worries, i understand the trepidation. yes, it will absolutely fit. trust me, im a random guy on the internet, lol. seriously though, i'm not here to steer you wrong. if i was wrong, about 26 people would be in here correcting/shaming me. i expect no less. i digress...

the wheel offsets you listed is pretty conservative and are basically oem fitments. theyre not going to stick out AT ALL. it will fit and so will the tires. no rubbing or anything obnoxious.

a 255/35/20 will not be stretched on a 9" wide wheel.

a 255/35/20 Continental EXTREMECONTACT DWS 06 PLUS has a section width (absolute widest part of tire, usually measured from edges of sidewall to sidewall) of 10.2" when measured on a 9" wide wheel. it has a tread width (the actual part you drive on) of 8.8".

a 255/35/20 Firestone Firehawk Indy 500 has a section width of 10.2" but a tread width of 9.0". it would appear very slightly wider on a 20x9 wheel. you would probably be hard pressed to notice unless you looked closely however.

now, at first glance, that sounds like its going to bulge a little but rest assured, it does not. when aired up and mounted, the tire will fit perfectly. ive included a pic of a 255/35/20 mounted on a 20x9 rim. the overall size is nearly identical to stock (1% difference, 1mph different at 70mph).
Tire Wheel Car Vehicle Hood

different brands will vary slightly in section width because some have rim protectors built in or additional sidewall reinforcement (or not) which will affect the section width but not section width. some brands tread width will vary slightly due to tread design. designs with more squared shoulders tend to run wider than others. its not a huge different at a 255 tread width (+/- .25" at most) but it varies more once you get to the 295 and up range.

 

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Discussion Starter · #12 ·
No worries, i understand the trepidation. yes, it will absolutely fit. trust me, im a random guy on the internet, lol. seriously though, i'm not here to steer you wrong. if i was wrong, about 26 people would be in here correcting/shaming me. i expect no less. i digress...

the wheel offsets you listed is pretty conservative and are basically oem fitments. theyre not going to stick out AT ALL. it will fit and so will the tires. no rubbing or anything obnoxious.

a 255/35/20 will not be stretched on a 9" wide wheel.

a 255/35/20 Continental EXTREMECONTACT DWS 06 PLUS has a section width (absolute widest part of tire, usually measured from edges of sidewall to sidewall) of 10.2" when measured on a 9" wide wheel. it has a tread width (the actual part you drive on) of 8.8".

a 255/35/20 Firestone Firehawk Indy 500 has a section width of 10.2" but a tread width of 9.0". it would appear very slightly wider on a 20x9 wheel. you would probably be hard pressed to notice unless you looked closely however.

now, at first glance, that sounds like its going to bulge a little but rest assured, it does not. when aired up and mounted, the tire will fit perfectly. ive included a pic of a 255/35/20 mounted on a 20x9 rim. the overall size is nearly identical to stock (1% difference, 1mph different at 70mph).
View attachment 108317
different brands will vary slightly in section width because some have rim protectors built in or additional sidewall reinforcement (or not) which will affect the section width but not section width. some brands tread width will vary slightly due to tread design. designs with more squared shoulders tend to run wider than others. its not a huge different at a 255 tread width (+/- .25" at most) but it varies more once you get to the 295 and up range.

Ok brother, I’m liking the 255/35zr20 Michelin pilot sport all season 4 on a square setup...will there be any issues to deal with? And you know I don’t want a stretch lol...
Big Ed
 

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Personally, I would go with 265s on a 9" wide wheel. 255s will be fine however. Please refer to my previous posts with pictures, they show you what a 255 and a 275 looks like on a 9" wheel. 255 isn't going to look bad, it'll look like a stock 245/40/19 on the 19x8.5" wide oem wheel
 
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Discussion Starter · #14 ·
Personally, I would go with 265s on a 9" wide wheel. 255s will be fine however. Please refer to my previous posts with pictures, they show you what a 255 and a 275 looks like on a 9" wheel. 255 isn't going to look bad, it'll look like a stock 245/40/19 on the 19x8.5" wide oem wheel
and one more time for my ocd....either the 255 or 265/35r20 will be good for a square setup? i just don't wanna get too wide for the fronts to stick outta the wheel well or rub anything is all.
thanks again bro,
Big Ed
 

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np, i got you covered. either tire size is fine. if you like a beefier tire look, go with 265, if you like a more regular tire look, go 255.

here are two links. the first link shows a stock 17" oem wheel vs your new setup with 255s and the second shows 19" oem RWD red sport front wheels compared to your new setup with 255s. im showing you these differences because the first link will probably concern you, lol. the second link with the rwd red sport front wheel compared to your setup should give you some solace. i promise its going to fit, not going to poke out, or have stretched tires.



your wheel package will stick out a whopping 4mm more compared to a RWD Q50 RS in the front and will be 3mm LESS than a RWD Q50 with 19x9.5+50 wheels.

long story short, your wheels are going to fit like a RWD Q50 RS. youre good to go.
 
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