Need help on tire size
Thread Starter
Driver
Joined: Jul 2013
Posts: 189
Likes: 2
From: UT
Need help on tire size
I have a 2014 IS350 Fsport AWD
I need help on which tire size to buy. I was told to go 245/35/20 in the front and 275/40/20 in the rear. Is this a good size. I plan on getting Vossen VFS2 20"
But I've seen people go 30 or 35 on the rear
I need help on which tire size to buy. I was told to go 245/35/20 in the front and 275/40/20 in the rear. Is this a good size. I plan on getting Vossen VFS2 20"
But I've seen people go 30 or 35 on the rear
Instructor
Joined: Dec 2013
Posts: 931
Likes: 82
From: Tennessee
I had 245/35/19 (I now have 235/35) on the front and rubbed bad enough to wear a hole in the fender liner. I'm lowered on RSR half downs. I would imagine that this size tire on 20's would be trouble.
I have 275/30/19 in the back and haven't noticed any problems (can't speak to 20's). I'm pretty sure that 275/40 would be trouble.
I rarely have more than one passenger in the car.
I have 275/30/19 in the back and haven't noticed any problems (can't speak to 20's). I'm pretty sure that 275/40 would be trouble.
I rarely have more than one passenger in the car.
Lexus Test Driver
Joined: Dec 2015
Posts: 1,476
Likes: 60
From: California
I had 245/35/19 (I now have 235/35) on the front and rubbed bad enough to wear a hole in the fender liner. I'm lowered on RSR half downs. I would imagine that this size tire on 20's would be trouble.
I have 275/30/19 in the back and haven't noticed any problems (can't speak to 20's). I'm pretty sure that 275/40 would be trouble.
I rarely have more than one passenger in the car.
I have 275/30/19 in the back and haven't noticed any problems (can't speak to 20's). I'm pretty sure that 275/40 would be trouble.
I rarely have more than one passenger in the car.
Thread Starter
Driver
Joined: Jul 2013
Posts: 189
Likes: 2
From: UT
I had 245/35/19 (I now have 235/35) on the front and rubbed bad enough to wear a hole in the fender liner. I'm lowered on RSR half downs. I would imagine that this size tire on 20's would be trouble.
I have 275/30/19 in the back and haven't noticed any problems (can't speak to 20's). I'm pretty sure that 275/40 would be trouble.
I rarely have more than one passenger in the car.
I have 275/30/19 in the back and haven't noticed any problems (can't speak to 20's). I'm pretty sure that 275/40 would be trouble.
I rarely have more than one passenger in the car.
Instructor
Joined: Dec 2013
Posts: 931
Likes: 82
From: Tennessee
There has only been one instance where I heard it rub - a huge dip at the seam of an interstate on ramp.
I haven't noticed any difference in the transmission.
I haven't noticed any difference in the transmission.
Thread Starter
Driver
Joined: Jul 2013
Posts: 189
Likes: 2
From: UT
Instructor
Joined: Dec 2013
Posts: 931
Likes: 82
From: Tennessee
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Thread Starter
Driver
Joined: Jul 2013
Posts: 189
Likes: 2
From: UT
245/35/20 in the front and 275/40/20 in the rear. Is this a good size
No, your front vs. rear RPM will be off by 7%.
Read my post here: https://www.clublexus.com/forums/rc-...ml#post9954590
No, your front vs. rear RPM will be off by 7%.
Read my post here: https://www.clublexus.com/forums/rc-...ml#post9954590
26.476 Front
26.578 Rear
Lexus Test Driver
Joined: Feb 2017
Posts: 6,260
Likes: 1,752
From: Richmond Hill, Ontario, Canada
I'm surprised you were even able to shoehorn it onto the vehicle.
I don't think you mentioned what the width of the 20's are, so that will determine tire size also.
As you can see from my signature, I have square 20's with 235/30/20 all around. No rubbing other than full lock on the front will rub on the vent in the wheel well.
It's only slight, and how often is anyone at full lock? Hardly ever, and likely you are going 1kmph when you are.
I'm not sure if your rims are staggered or square, or why you wanted the 275 on the rear.
Maybe you can provide the rim specs, and that may lead to a solution of best tire size.
Thread Starter
Driver
Joined: Jul 2013
Posts: 189
Likes: 2
From: UT
Unfortunately I only saw this thread now, but I would have told you the 275/30/20 is way too big for the rear.
I'm surprised you were even able to shoehorn it onto the vehicle.
I don't think you mentioned what the width of the 20's are, so that will determine tire size also.
As you can see from my signature, I have square 20's with 235/30/20 all around. No rubbing other than full lock on the front will rub on the vent in the wheel well.
It's only slight, and how often is anyone at full lock? Hardly ever, and likely you are going 1kmph when you are.
I'm not sure if your rims are staggered or square, or why you wanted the 275 on the rear.
Maybe you can provide the rim specs, and that may lead to a solution of best tire size.
I'm surprised you were even able to shoehorn it onto the vehicle.
I don't think you mentioned what the width of the 20's are, so that will determine tire size also.
As you can see from my signature, I have square 20's with 235/30/20 all around. No rubbing other than full lock on the front will rub on the vent in the wheel well.
It's only slight, and how often is anyone at full lock? Hardly ever, and likely you are going 1kmph when you are.
I'm not sure if your rims are staggered or square, or why you wanted the 275 on the rear.
Maybe you can provide the rim specs, and that may lead to a solution of best tire size.
It's staggered
fronts are 245/35/20, 20x9 + 18
rears are 275/30/20, 20x10.5 + 45
I don't know anything about tire or wheel size and that's what people recommended me to get. I went to discount tires and that's what they recommended me. And I just found they ordered me 20x10.5, instead of 20x10 that I asked. They told me if do 265, I should be good.
Lexus Test Driver
Joined: Feb 2017
Posts: 6,260
Likes: 1,752
From: Richmond Hill, Ontario, Canada
It's staggered
fronts are 245/35/20, 20x9 + 18
rears are 275/30/20, 20x10.5 + 45
I don't know anything about tire or wheel size and that's what people recommended me to get. I went to discount tires and that's what they recommended me. And I just found they ordered me 20x10.5, instead of 20x10 that I asked. They told me if do 265, I should be good.
fronts are 245/35/20, 20x9 + 18
rears are 275/30/20, 20x10.5 + 45
I don't know anything about tire or wheel size and that's what people recommended me to get. I went to discount tires and that's what they recommended me. And I just found they ordered me 20x10.5, instead of 20x10 that I asked. They told me if do 265, I should be good.
I'm surprised the front isn't rubbing. I think it's safe to say lowering the vehicle is out of the question.
If you intend on keeping the 20's, and the front isn't rubbing, then just leave it as is.
For the rear, because the rim is 20X10.5, you're very limited on what you can do.
Going to a 265/35/20 is your only option, and hope it doesn't rub.
And you might be thinking why not a 265/30/20...simply because the tire is too small for a 10.5 inch rim...it has to do with the sidewall height.
The limit for a 265/35/20 is a 10.5 inch rim...265/30/20, the limit is a 10 inch rim.
The bad news is going from a 275/30 to a 265/35 will only reduce the overall width of the tire by half an inch. If you need more than a quarter inch of clearance where it's rubbing, then the 265/35 won't resolve your issue.
If there is an possibility of swapping out the rear rims for a 20X9.5 or even a 20X10, I'd do that first and then get proper tires that will fit.
Does the front rub?
Is the rear rubbing on the fender?