Upgrade wheel set - opinion on increased overall diameter
Thread Starter
Driver School Candidate
Joined: Mar 2020
Posts: 8
Likes: 2
From: ON
From your 2 options above, #1 is the ideal scenario. You would reduce the profile height because the rim size increased. But as you're going with wider rims, you would also need to increase the width of the tire as well.
To address the 26" diameter question, I ran 235/30/20 which has a 25.6" diameter, and I am lowered on RSR Downs (over 1 inch drop front and rear...I think closer to 2 inches in the rear)...so running 26" at stock height will be more than fine.
This summer I will be dropping to staggered 18's...8.5 front and 9.5 rear. Still haven't decided on tire sizes, but still have a little more time to go before the winters come off...truly I could use stock F Sport rim sizes and it would be fine.
To address the 26" diameter question, I ran 235/30/20 which has a 25.6" diameter, and I am lowered on RSR Downs (over 1 inch drop front and rear...I think closer to 2 inches in the rear)...so running 26" at stock height will be more than fine.
This summer I will be dropping to staggered 18's...8.5 front and 9.5 rear. Still haven't decided on tire sizes, but still have a little more time to go before the winters come off...truly I could use stock F Sport rim sizes and it would be fine.
Therefore since I am increasing the front rim width by 0.5" (12.7 mm) and the rear by 1.0" (25.4 mm) would you suggest increasing the tire width to 235 and 275? Will this affect fuel economy by much?
Thread Starter
Driver School Candidate
Joined: Mar 2020
Posts: 8
Likes: 2
From: ON
Front: (DIFFERENCE FROM OE EQUIPMENT)
Rim - 19" x 8.5" offset +35 (Back spacing -0.144", Stance +0.644")
Tire - 245/30R19 (Width +20 mm, Profile -0.167")
Overall Diameter - 25.752" (+0.665" / +2.65 %)
Rear:
Rim - 19" x 9.5" offset +40 (Back spacing +0.106", Stance +0.894")
Tire - 285/30R19 (Width +30 mm, Profile -0.148")
Overall Diameter - 25.732" (+0.705 / +2.82 %)
Tire - 245/30R19 (Width +20 mm, Profile -0.167")
Overall Diameter - 25.752" (+0.665" / +2.65 %)
Rear:
Rim - 19" x 9.5" offset +40 (Back spacing +0.106", Stance +0.894")
Tire - 285/30R19 (Width +30 mm, Profile -0.148")
Overall Diameter - 25.732" (+0.705 / +2.82 %)
Last edited by MILLIKEN9; Mar 17, 2020 at 08:30 AM.
Lexus Test Driver
Joined: Feb 2017
Posts: 6,260
Likes: 1,752
From: Richmond Hill, Ontario, Canada
You could use 235/35/19 on the front and 265/30/19 on the rear and that would be an easier fitment in terms of clearance.
The size difference in the tires is not an issue.
Lexus Test Driver
Joined: Feb 2017
Posts: 6,260
Likes: 1,752
From: Richmond Hill, Ontario, Canada
Has anyone run this set up on a stock suspension:
Front: (DIFFERENCE FROM OE EQUIPMENT)
Rim - 19" x 8.5" offset +35 (Back spacing -0.144", Stance +0.644")
Tire - 245/30R19 (Width +20 mm, Profile -0.167")
Overall Diameter - 25.752" (+0.665" / +2.65 %)
Rear:
Rim - 19" x 9.5" offset +40 (Back spacing +0.106", Stance +0.894")
Tire - 285/30R19 (Width +30 mm, Profile -0.148")
Overall Diameter - 25.732" (+0.705 / +2.82 %)
Tire - 245/30R19 (Width +20 mm, Profile -0.167")
Overall Diameter - 25.752" (+0.665" / +2.65 %)
Rear:
Rim - 19" x 9.5" offset +40 (Back spacing +0.106", Stance +0.894")
Tire - 285/30R19 (Width +30 mm, Profile -0.148")
Overall Diameter - 25.732" (+0.705 / +2.82 %)
Thread Starter
Driver School Candidate
Joined: Mar 2020
Posts: 8
Likes: 2
From: ON
Lexus Test Driver
Joined: Feb 2017
Posts: 6,260
Likes: 1,752
From: Richmond Hill, Ontario, Canada
My money is on +35 front and +40 rear.
Those wheels in that size are available as +35 and +40 for the front and +40 and +42 for the rear.
They mentioned minimal rubbing, which I assume is the rear, and based on how low it's dropped there shouldn't be rubbing with a +42, so likely the rear is a +40.
Those wheels in that size are available as +35 and +40 for the front and +40 and +42 for the rear.
They mentioned minimal rubbing, which I assume is the rear, and based on how low it's dropped there shouldn't be rubbing with a +42, so likely the rear is a +40.
Former Sponsor
Joined: Feb 2019
Posts: 942
Likes: 64
From: CA
My money is on +35 front and +40 rear.
Those wheels in that size are available as +35 and +40 for the front and +40 and +42 for the rear.
They mentioned minimal rubbing, which I assume is the rear, and based on how low it's dropped there shouldn't be rubbing with a +42, so likely the rear is a +40.
Those wheels in that size are available as +35 and +40 for the front and +40 and +42 for the rear.
They mentioned minimal rubbing, which I assume is the rear, and based on how low it's dropped there shouldn't be rubbing with a +42, so likely the rear is a +40.
Lexus Test Driver
Joined: Feb 2017
Posts: 6,260
Likes: 1,752
From: Richmond Hill, Ontario, Canada
Thanks for confirming.
It was difficult to find the offsets for those wheels, had to scour a few different websites, and +32 was not offered by the one site I found that actually showed the offsets.
I had checked Blaque Diamonds website, but no offsets listed there...which seems odd as you are the manufacturer...unless offsets are custom, therefore no need to post them as they can be whatever you want/need.
It was difficult to find the offsets for those wheels, had to scour a few different websites, and +32 was not offered by the one site I found that actually showed the offsets.
I had checked Blaque Diamonds website, but no offsets listed there...which seems odd as you are the manufacturer...unless offsets are custom, therefore no need to post them as they can be whatever you want/need.
Former Sponsor
Joined: Feb 2019
Posts: 942
Likes: 64
From: CA
Thanks for confirming.
It was difficult to find the offsets for those wheels, had to scour a few different websites, and +32 was not offered by the one site I found that actually showed the offsets.
I had checked Blaque Diamonds website, but no offsets listed there...which seems odd as you are the manufacturer...unless offsets are custom, therefore no need to post them as they can be whatever you want/need.
It was difficult to find the offsets for those wheels, had to scour a few different websites, and +32 was not offered by the one site I found that actually showed the offsets.
I had checked Blaque Diamonds website, but no offsets listed there...which seems odd as you are the manufacturer...unless offsets are custom, therefore no need to post them as they can be whatever you want/need.
Pole Position
Joined: Jul 2010
Posts: 2,944
Likes: 182
From: Los Angeles, CA
My previous car above was on 19s and I also thought they looked really good on the car but only after it was lowered. If I hadn't lowered the car it would have looked odd with regard to proportion as E46CT pointed out above.
Always gonna think of you when I hear that now. Again, congrats and glad it worked out.
Pole Position
Joined: Jul 2010
Posts: 2,944
Likes: 182
From: Los Angeles, CA
thanks, though! i'm glad it all worked out as well!
Advanced
Joined: May 2018
Posts: 653
Likes: 96
From: PA
i was curious on this as welll-- got AWD, and the stock tires are great for performance but hard on the bumps...i certainly could use the next taller sidewall--but i wasnt sure if it would fit.
I also assumed since AWD the tires should match in height
i am running stock rims (tink 18")
I also assumed since AWD the tires should match in height
i am running stock rims (tink 18")
Thread Starter
Driver School Candidate
Joined: Mar 2020
Posts: 8
Likes: 2
From: ON
Pole Position
Joined: Jul 2010
Posts: 2,944
Likes: 182
From: Los Angeles, CA