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Max Tire Diameter For R/t
#1
Posted 15 February 2015 - 07:29 PM
Driving a 2014 Challenger R/T. My rear tires on my car are completely bald. I am currently running a 295/35-20 nitto invo on the rears which is about 28.1 inch tall. I'm on stock suspension & without lowering my car, I want to try n close the gap a bit with a thicker sidewall/taller wheel.
Im thinking of going a 295/40-20 which is 29.29" tall. Trying to see if I can go a littler taller. Reading online it looks like the tallest tire to fit ranges from 28"-31"; but nothing with a definitive answer.
Has anyone confirmed this or have any insight on the tallest tire to fit on stock suspension?
2014 Challenger R/T 6-Spd (Car Nickname: Dirty Dye)
Performance Mods: Hurst Shifter (upgrading to Barton after 2014); 180' JET T-Stat; K&N Aircharger CAI; Flowmaster original 40 series mufflers; JBA LT Headers & Mid-pipes (catless); Arrington 88MM TB; Ported 88mm 5.7 intake manifold to match 88mm TB; 274 comp cam including Spring/Retainer kit & Hardened Push Rods.
http://youtu.be/MKGhjsLcNTw *Tuning still being done*
1/4 PB: 12.79@110
60ft: 1.88
"Do not limit your challenges, challenge your limits"
#2
Posted 15 February 2015 - 08:16 PM
Should be just fine.
What wheels are those? Not sure with your offset but looks like it'd work.

Bunch of go fast goodies from my friend at;
BFNY Performance, Hemi Tuner Performance, Kenne Bell, Thitec, MotorCity Speed, Paramount Performance, Speedlogix, Arrington, Pettys Garage, High Horse Performance, DJ's Safety, Drive Shaft Shop, Summit, Moroso, LegMaker and soon to be more.
Special Thanks to;
Erik, AJ, Jim Bell, Big Ben, Karl, Guy, John L., Kenny, Sam, Chris, and more I'm sure I've overlooked!
#3
Posted 16 February 2015 - 09:28 AM
#4
Posted 16 February 2015 - 09:54 AM
As you go taller, you have less room for width.
I run 255/50R20 Yohomama Parada. It's 30.1 inches tall, but not very wide.
I did it to bring the highway RPM down with the 3.91 gears.


10.29@132 mph Aluminum 468 in '05 Magnum R/T
Hemituner, Arrington, GTP, FTI, Paramount, Driveshaft Shop, and a few other goodies.
#5
Posted 16 February 2015 - 10:14 AM
For running the Mile events I'm running a Yokohama Advant Sport 295/40/20 on the rear, they are advertised as being 29.4" tall but mounted on stock 2010 Alcoa's they actually measure right on 30". Tire's of the same size will vary from manufacture to manufacture, I had BFG KDW's, Continental DWS Extreme and the Yoko Adant Sports all side by side and there was a little over 3/4 difference in the overall diameter.
Now I would not recommend the Yoko Advant Sports, they suck for traction. Now for a street tire I love the Continental DWS Extreme's for over all performance.
#6
Posted 16 February 2015 - 10:40 AM
#7
Posted 20 February 2015 - 01:35 PM
Before:
After:
The nitto invos 295/35R20 stand at 28.1" tall compared to the Toyo proxies at 29.3" tall. I'm diggin em so far, no issues or rubbing. Like how much sidewall there is.
2014 Challenger R/T 6-Spd (Car Nickname: Dirty Dye)
Performance Mods: Hurst Shifter (upgrading to Barton after 2014); 180' JET T-Stat; K&N Aircharger CAI; Flowmaster original 40 series mufflers; JBA LT Headers & Mid-pipes (catless); Arrington 88MM TB; Ported 88mm 5.7 intake manifold to match 88mm TB; 274 comp cam including Spring/Retainer kit & Hardened Push Rods.
http://youtu.be/MKGhjsLcNTw *Tuning still being done*
1/4 PB: 12.79@110
60ft: 1.88
"Do not limit your challenges, challenge your limits"
#8
Posted 20 February 2015 - 01:39 PM
Thanks for the input fellas. I went ahead and went with Toyo Proxies ST II - 295/40R20
Before:
After:
The nitto invos 295/35R20 stand at 28.1" tall compared to the Toyo proxies at 29.3" tall. I'm diggin em so far, no issues or rubbing. Like how much sidewall there is.
What is the speed rating on the Proxies ?
Never mind, just saw the 106V speed rating on the tire, 149mph.
#9
Posted 20 February 2015 - 01:44 PM
2014 Challenger R/T 6-Spd (Car Nickname: Dirty Dye)
Performance Mods: Hurst Shifter (upgrading to Barton after 2014); 180' JET T-Stat; K&N Aircharger CAI; Flowmaster original 40 series mufflers; JBA LT Headers & Mid-pipes (catless); Arrington 88MM TB; Ported 88mm 5.7 intake manifold to match 88mm TB; 274 comp cam including Spring/Retainer kit & Hardened Push Rods.
http://youtu.be/MKGhjsLcNTw *Tuning still being done*
1/4 PB: 12.79@110
60ft: 1.88
"Do not limit your challenges, challenge your limits"
#10
Posted 20 February 2015 - 01:49 PM
As you go taller, you have less room for width.
I run 255/50R20 Yohomama Parada. It's 30.1 inches tall, but not very wide.
I did it to bring the highway RPM down with the 3.91 gears.
Jon... THAT's the solution I'm looking for!
Except a slightly wider tire... saaaayyy.... 275 at least. I'm just trying to search and find such a tire. You know of any?
PWR Forged 6.1 block -V7 YSI (18psi)- Modern Muscle ported intake manifold - Indy Heads - Modern Muscle custom cam - TTI Longtube(catless) - Paramount TC/Transmission- 3.06 Getrag-325/45/17M&H
#11
Posted 20 February 2015 - 03:04 PM
Jon... THAT's the solution I'm looking for!
Except a slightly wider tire... saaaayyy.... 275 at least. I'm just trying to search and find such a tire. You know of any?
Nope. I drive like an old lady. No need to cram a wide tire on mine, so I go with what I know will fit without heating and beating.


10.29@132 mph Aluminum 468 in '05 Magnum R/T
Hemituner, Arrington, GTP, FTI, Paramount, Driveshaft Shop, and a few other goodies.
#12
Posted 20 February 2015 - 03:07 PM
Nope. I drive like an old lady. No need to cram a wide tire on mine, so I go with what I know will fit without heating and beating.
Wasnt asking for you.... I was asking for my sled. ![]()
Ive got the294/40/20 on here now (29.29 dia / 11.61" width), but I'd give up some width to go taller with the 3.91 gear
PWR Forged 6.1 block -V7 YSI (18psi)- Modern Muscle ported intake manifold - Indy Heads - Modern Muscle custom cam - TTI Longtube(catless) - Paramount TC/Transmission- 3.06 Getrag-325/45/17M&H
#13
Posted 20 February 2015 - 03:11 PM
Wasnt asking for you.... I was asking for my sled.
Ive got the294/40/20 on here now (29.29 dia / 11.61" width), but I'd give up some width to go taller with the 3.91 gear
255/50R20 Parada Spec X is 30.1 tall and 10.2 wide. Fits with no modifications and no rubbing.
275/45R20 Parada Spec X is 29.9 tall and 10.6 wide.
295/45R20 Parada Spec X is 30.6 tall and 11.6 wide.
Good luck.
FYI, running a 30" tire with 3.91 gears gives you the same highway cruising RPM as stock 28" tires and a 3.73 gear.


10.29@132 mph Aluminum 468 in '05 Magnum R/T
Hemituner, Arrington, GTP, FTI, Paramount, Driveshaft Shop, and a few other goodies.
#14
Posted 20 February 2015 - 03:30 PM
You like those Parada Spec X tires huh? I've never tried them... Faulken Azenis FK453 on now. Not bad. Better than the VRed's I used to have.
PWR Forged 6.1 block -V7 YSI (18psi)- Modern Muscle ported intake manifold - Indy Heads - Modern Muscle custom cam - TTI Longtube(catless) - Paramount TC/Transmission- 3.06 Getrag-325/45/17M&H
#15
Posted 20 February 2015 - 04:30 PM
255/50R20 Parada Spec X is 30.1 tall and 10.2 wide. Fits with no modifications and no rubbing.
275/45R20 Parada Spec X is 29.9 tall and 10.6 wide.
295/45R20 Parada Spec X is 30.6 tall and 11.6 wide.
Good luck.
FYI, running a 30" tire with 3.91 gears gives you the same highway cruising RPM as stock 28" tires and a 3.73 gear.
Wish they had a higher speed rating on them. ;(
#16
Posted 20 February 2015 - 04:49 PM
Wish they had a higher speed rating on them. ;(
V is plenty for me.


10.29@132 mph Aluminum 468 in '05 Magnum R/T
Hemituner, Arrington, GTP, FTI, Paramount, Driveshaft Shop, and a few other goodies.
#17
Posted 21 February 2015 - 07:42 AM
V is plenty for me.
I need the Y rating 186+ of the Mile races. Not a lot available in the size tires we use.
#18
Posted 21 February 2015 - 07:57 AM
Billy Briggs built 440 with"Thiteks"
Prepared and installed at BFNY!
Tuned by AJ @ Hemituner Performance
Paramount trans.
#19
Posted 21 February 2015 - 08:57 AM
I have some Hankook 295-45-20's stuffed into the back well's, No rubbing and ride nice on the magnum. This tire is a massive 30.5" tall for final drive ratio reduction.
Sure wish they made something that tall with a Y speed rating.
#20
Posted 21 February 2015 - 07:59 PM
There's a 315/40-19 (A6 or R6) with a 12.9" section width (1.5" wider than stock, might fit ok), but it's diameter is 28.9
Quoted from some place on the inter web.
That tire would do.

Bunch of go fast goodies from my friend at;
BFNY Performance, Hemi Tuner Performance, Kenne Bell, Thitec, MotorCity Speed, Paramount Performance, Speedlogix, Arrington, Pettys Garage, High Horse Performance, DJ's Safety, Drive Shaft Shop, Summit, Moroso, LegMaker and soon to be more.
Special Thanks to;
Erik, AJ, Jim Bell, Big Ben, Karl, Guy, John L., Kenny, Sam, Chris, and more I'm sure I've overlooked!
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