Anyone put rear wheels on the front?
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From: MO
Anyone put rear wheels on the front?
So I'm looking at the specs of my 350 AWD F-Sport and the wheels are very similar front to back, just a half inch and 5mm offset difference. There is PLENTY of room in there, so it led me to wonder. Has anyone just fitted a stock rear wheel/tire combo to the front? Looks like there is plenty of room, and the square set-up would be good for tires. Beyond that, less understeer can't be a bad thing. Am I missing something? I mean, why did Lexus even fit the smaller combo to the front?
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From: MO
Thanks. I think there are a lot of guys running the 8.5 in front, but mostly with 235's. But the stock Turanza 255 is so skinny, I figure it'd work.
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From: MO
Lexus Test Driver
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So I'm looking at the specs of my 350 AWD F-Sport and the wheels are very similar front to back, just a half inch and 5mm offset difference. There is PLENTY of room in there, so it led me to wonder. Has anyone just fitted a stock rear wheel/tire combo to the front? Looks like there is plenty of room, and the square set-up would be good for tires. Beyond that, less understeer can't be a bad thing. Am I missing something? I mean, why did Lexus even fit the smaller combo to the front?
Check this video out.
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From: MO
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Lexus Test Driver
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Thank you, but I think I already know what it's going to say. I'm not interested in more grip, or more performance, just easier tire wear, and if the rear will fit on the front, then why not? I have a Lotus Exige for my toy, so this car is more for my in town and highway normal driving.
also with the way our cars wear front tires, all you're doing by doing this, if you're not interested in performance, is increasing the cost of the tire you have to replace.
in your situation then i'd just stay stock.
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Thread Starter
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From: MO
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It's the stock control arm bushings causing dynamic toe change. Basically every time you brake the tires are squirming around on the road. Or every time you hit a bump mid turn. It's a necessary design element for the way these cars are supposed to drive. Same as Porsche, Mercedes, BMW, or any other car designed to be firm yet compliant. The best way to mitigate is use RC-F or GS-F front control arm bushings. Direct bolt on. They use firmer rubber so keeps the tires MORE in place. About $120 for the pair.
Some go with a totally firm poly bushing setup but that'll just cause a whole bunch of noise, vibration, and unwanted side effects relating to understeer (since you're stiffening the front and keeping the back soft) The front tires need some sort of compliance. Not to mention these hard bushings are expensive. $300-400.
Some go with a totally firm poly bushing setup but that'll just cause a whole bunch of noise, vibration, and unwanted side effects relating to understeer (since you're stiffening the front and keeping the back soft) The front tires need some sort of compliance. Not to mention these hard bushings are expensive. $300-400.
Thread Starter
Pole Position
Joined: Oct 2018
Posts: 370
Likes: 35
From: MO
It's the stock control arm bushings causing dynamic toe change. Basically every time you brake the tires are squirming around on the road. Or every time you hit a bump mid turn. It's a necessary design element for the way these cars are supposed to drive. Same as Porsche, Mercedes, BMW, or any other car designed to be firm yet compliant. The best way to mitigate is use RC-F or GS-F front control arm bushings. Direct bolt on. They use firmer rubber so keeps the tires MORE in place. About $120 for the pair.
Some go with a totally firm poly bushing setup but that'll just cause a whole bunch of noise, vibration, and unwanted side effects relating to understeer (since you're stiffening the front and keeping the back soft) The front tires need some sort of compliance. Not to mention these hard bushings are expensive. $300-400.
Some go with a totally firm poly bushing setup but that'll just cause a whole bunch of noise, vibration, and unwanted side effects relating to understeer (since you're stiffening the front and keeping the back soft) The front tires need some sort of compliance. Not to mention these hard bushings are expensive. $300-400.
I'm planning to get larger sidewall tires are some point, not a lot larger, but the current rubberbands are just too damn small for my taste. Interesting that car rides so well with them, I would have thought they were 45 sidewall with out soft it is.
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Only one person has done it so far. Flash5. This is a relatively new thing people are trying. Just blossomed a few weeks ago (the idea to install GSF bushings) You won't find a DIY though. People on these types of forums don't really DIY much, and if they do, they rarely post. But if you can turn a wrench you can do it. It's three bolts/nuts max per side. Unbolt, slide it off, slide the new one on. They should be tightened down at static height though so you'll want the suspension loaded and on ramps before you torque the bushing sleeves down to the arm. an alignment rack works best for this.
As for tires--Some people have gone up one size sidewall height.
As for tires--Some people have gone up one size sidewall height.
Thread Starter
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Joined: Oct 2018
Posts: 370
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From: MO
Only one person has done it so far. Flash5. This is a relatively new thing people are trying. Just blossomed a few weeks ago (the idea to install GSF bushings) You won't find a DIY though. People on these types of forums don't really DIY much, and if they do, they rarely post. But if you can turn a wrench you can do it. It's three bolts/nuts max per side. Unbolt, slide it off, slide the new one on. They should be tightened down at static height though so you'll want the suspension loaded and on ramps before you torque the bushing sleeves down to the arm. an alignment rack works best for this.
As for tires--Some people have gone up one size sidewall height.
As for tires--Some people have gone up one size sidewall height.
Much appreciation sir, much appreciation.
Lexus Test Driver
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The reason the dynamic toe thing makes sense is because we had the same exact thing happen over on the BMW side... just not as bad.
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From: GA
Only one person has done it so far. Flash5. This is a relatively new thing people are trying. Just blossomed a few weeks ago (the idea to install GSF bushings) You won't find a DIY though. People on these types of forums don't really DIY much, and if they do, they rarely post. But if you can turn a wrench you can do it. It's three bolts/nuts max per side. Unbolt, slide it off, slide the new one on. They should be tightened down at static height though so you'll want the suspension loaded and on ramps before you torque the bushing sleeves down to the arm. an alignment rack works best for this.
As for tires--Some people have gone up one size sidewall height.
As for tires--Some people have gone up one size sidewall height.
EDIT: when I said “these” I was referring to the GS-F/RC-F bushings as the Poly bushings will definitely stop the dynamic toe at the expense of comfort.
Last edited by Flash5; Oct 30, 2018 at 08:51 PM.