[M2 SoCal]

Anyone gone up to 295 or 305 on the rear tires on the OEM wheels?

I was told I can do up to 305, but that seems too wide to me…

Will adding wider than OEM in the rear affect handling keeping the 275’s in front?

My rears are due to replace soon so looking for anyone’s experience.

[Dave07997S]

I wouldn't go above 295/30/20

[Whytar]

I agree, 295's on a 10.5 rim is about the limit. I have 305's on the rear of my 911 and they sit on 11" rims.

[techwhiz1]

Originally Posted by Whytar

I agree, 295's on a 10.5 rim is about the limit. I have 305's on the rear of my 911 and they sit on 11" rims.

A 10.5" rim is within the recommended width for a Continental 305/30-20 tire. Best to check with the manufacturer on suggested size.

[M2 SoCal]

Originally Posted by techwhiz1

A 10.5" rim is within the recommended width for a Continental 305/30-20 tire. Best to check with the manufacturer on suggested size.

Michelin

[ScottyRyan2019]

Originally Posted by M2 SoCal

Michelin

Yes, you can run a 305/30/20 Michelin on a 10.5" wheel ( recommended wheel size is 10.5 to 11.5 ) but it will look a tad bit stretched and you might loose a bit of the sidewall protection.

[Dave07997S]

Originally Posted by ScottyRyan2019

Yes, you can run a 305/30/20 Michelin on a 10.5" wheel ( recommended wheel size is 10.5 to 11.5 ) but it will look a tad bit stretched and you might loose a bit of the sidewall protection.

Not to mention the mismatch between the front and rear. The overall diameter changes from 26.8" to 27.2". You moved beyond the .3" tolerable level that most stability control can handle. The 295 is a much better fit.

[Orange fever]

About to order Wheels and the rear is going to be 11.5 rears on 305.30.20 tires hopefully it turns out good ///

[Ronin76]

Originally Posted by Dave07997S

Not to mention the mismatch between the front and rear. The overall diameter changes from 26.8" to 27.2". You moved beyond the .3" tolerable level that most stability control can handle. The 295 is a much better fit.

I have been thinking about this and unfortunately I do not understand the .3" tolerance level. Can someone please explain this to me?

I would like to eventually go to 285/35/19 on a 10" wheel up front and 305/30/20 on a 11" rear wheel. Is it OK to do this? Will it mess anything up with the car (stability wise)?

[Digitalprty]

Originally Posted by Ronin76

I have been thinking about this and unfortunately I do not understand the .3" tolerance level. Can someone please explain this to me?

I would like to eventually go to 285/35/19 on a 10" wheel up front and 305/30/20 on a 11" rear wheel. Is it OK to do this? Will it mess anything up with the car (stability wise)?

That’s what I plan to run, as well.

[Ronin76]

Originally Posted by Digitalprty

That’s what I plan to run, as well.

Glad I am not the only one. I think it is a good set up but didn’t realize there is so much more that goes into picking wheels and tires.

[Dave07997S]

Originally Posted by ScottyRyan2019

Yes, you can run a 305/30/20 Michelin on a 10.5" wheel ( recommended wheel size is 10.5 to 11.5 ) but it will look a tad bit stretched and you might loose a bit of the sidewall protection.

I think you mean pinched. A 305/30/20 will look pinched tad on 10.5" rim. The 285 on a 10.5" wheel looks stretched. I will probably switch out to a 295/30/20 on the OEM wheel.

[M2M3M3]

Originally Posted by Ronin76

I have been thinking about this and unfortunately I do not understand the .3" tolerance level. Can someone please explain this to me?

I would like to eventually go to 285/35/19 on a 10" wheel up front and 305/30/20 on a 11" rear wheel. Is it OK to do this? Will it mess anything up with the car (stability wise)?

the traction control monitors wheel speed. within the programmed tolerances for a difference between wheels speeds it thinks all is well. if the front or rear tires are turning faster or slower than expected, it will want to intervene as it thinks something is slipping. when you change the diameter of a tire you change the speed it spins at relative to the other tires.

need to keep the outside diameter of tires as close as possible to the stock diameter.

[Ronin76]

Originally Posted by M2M3M3

the traction control monitors wheel speed. within the programmed tolerances for a difference between wheels speeds it thinks all is well. if the front or rear tires are turning faster or slower than expected, it will want to intervene as it thinks something is slipping. when you change the diameter of a tire you change the speed it spins at relative to the other tires.

need to keep the outside diameter of tires as close as possible to the stock diameter.

Thank you for the easy to understand explanation!

[ScottyRyan2019]

Originally Posted by Dave07997S

I think you mean pinched. A 305/30/20 will look pinched tad on 10.5" rim. The 285 on a 10.5" wheel looks stretched. I will probably switch out to a 295/30/20 on the OEM wheel.

Yeah, I think I better quit posting at 2 AM 🤣

[Dave07997S]

Originally Posted by ScottyRyan2019

Yeah, I think I better quit posting at 2 AM 🤣

I knew what you meant!! LOL