IS350 255/35/18 on stock rear?
12-12-11, 02:58 PM
#1
IS350 255/35/18 on stock rear?
I'm replacing my stock 2IS350 tires with some V12's and thought about lowering the rear sidewall from the OEM 255/40/18 one size down to 255/35/18.
What do you guys think about this? Would it make the ride quality go to crap?
I am lowered so I also hope this would help equalize the "look" if the rear sidwall matches the front sidewall.
This is a daily driver, no track, lowered on coilovers to about one finger gap.
What do you guys think about this? Would it make the ride quality go to crap?
I am lowered so I also hope this would help equalize the "look" if the rear sidwall matches the front sidewall.
This is a daily driver, no track, lowered on coilovers to about one finger gap.
Last edited by Boofster; 12-12-11 at 03:32 PM.
12-13-11, 05:19 AM
#2
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First, the lower profile tire will require you to use a higher PSI in order to meet the load requirements for the vehicle, otherwise tire sidewall damage will result very easily. So, not only will there be less sidewall to cushion the ride you will also be using a higher PSI to make the tire even harder. Second, the vehicle left the factory designed for a 25" tire in the front and a 26" in the rear so if the tires all of a sudden start spinning the same revolutions per mile there will be an error message from the ABS. Also, the rear tire size plays an important roll as the final drive gear through the transmission if the tire is now smaller you will be running higher RPM'S at highway speeds.
12-13-11, 10:10 AM
#4
Wow ok that's a pretty good argument to keep the rear stock then.
What about upgrading the front to 225/45 ? Same issue?
I was asking about the rear because I'm noticing most aftermarket 18" wheels on the board are using 225/35. They seem ok with it.
What about upgrading the front to 225/45 ? Same issue?
I was asking about the rear because I'm noticing most aftermarket 18" wheels on the board are using 225/35. They seem ok with it.
Last edited by Boofster; 12-13-11 at 10:37 AM.
12-13-11, 12:37 PM
#5
If you are going to run a different profile in the front or the rear, the opposite axle should be change appropriately so that you don't run into issues with ABS, VSC and traction control... Just because it can be done doesn't mean its right... It is probably hard to find statistics for this, but I would venture there have been accidents that VSC could have prevented, but couldn't because of a mismatch in appropriate tires...
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