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245/45/18 tires

 
Old 06-14-19, 03:11 PM
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jwrichter
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Default 245/45/18 tires

I have read comments from 2 members that they are running a bit larger tires on their SC430 without any problems. I am having a set installed next week and just like to make double sure that no one has had any issues with this size tires on their car. I am hoping that the ride on these Michelin PRIMACY MXM4 will be quieter and soften the road separation "clunk" I have been experiencing. The Meister coil cover have made a world of difference in the overall handling of the car and I hope the tire change will be worth it.
Anyone having any comments regarding this tire size difference would be appreciated.
Thanks, Jim
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Old 06-14-19, 09:45 PM
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Caflashbob
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Worked great., nicer ride and noise
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Old 06-15-19, 06:16 AM
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jwrichter
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Thanks Bob
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Old 06-16-19, 06:08 PM
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Your speedometer and mileage will be like 5.7 off. If you went 235/45 it's down to 2.5%. I think the Pirelli P7 Plus is a better tire.

Last edited by Lavrishevo; 06-16-19 at 06:19 PM.
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Old 06-17-19, 03:59 PM
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jwrichter
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It will be off 3.5%, at 65 it will be going 67, I considered the 235/45 but it is close to 3/4" narrower.
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Old 06-17-19, 04:25 PM
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Originally Posted by jwrichter View Post
It will be off 3.5%, at 65 it will be going 67, I considered the 235/45 but it is close to 3/4" narrower.
That's less then I remembered. These run flats are really hard. I want the P7's. Need to wear this set out first.
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Old 06-17-19, 05:06 PM
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I have the P7's on my 2010 LS 460L in a 19 inch. They have a tread warranty of 70K I love them however I will not get 40K out them. On the 245/40/18's which is the tire for our SC's they have no tread warranty according to Tire Rack anyway.

Dennis
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Old 06-21-19, 03:48 AM
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Got the tires installed yesterday and they cut down the road noise and roadway separation noise by at least 50%. Very happy with the tires and Costco treated me right!
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Old 06-21-19, 07:58 AM
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Very nice. I also can't wait get rid of the run flats. I was disappointed Costco does not carry the P7. Costco does allow you to bring your own tires. How is the ride quality?

As far as 19" rims, 40k miles is actually pretty good.

Last edited by Lavrishevo; 06-21-19 at 07:42 PM.
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Old 06-24-19, 05:58 AM
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Ride quality much improved over the super sports.
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