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Discussion Starter #1
2016.5 SL, standard, no mod's.
I'm thinking about pushing my wheel sizes up.
Now -
Front: 225/45-18, wheel 7.5X18
Back: 255/35-18, wheel 9X20

Proposed -
Front: 235/40 or 45, or 245/40, 45 or 50 (245 is max a 7.5 can take)
Back: 275/40 or 45 (275 is max for a 9)

I know this will throw my speedometer scale out the window. I will need to put in hard stops for the wheel turning movement (ratio will be reduced to prevent rubbing).
Also, I've been considering increasing the wheels and pushing the tires even further - maybe/maybe not. Maybe just increasing the wheels will be enough.
 

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Thinking you meant current rear is: 255/35/20 (not 18).
I am interested in a budget friendly setup for wider rear skins on my 20 in SL rear rims (quad kit).
Let us know what works best for you.

WW
 

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2016.5 SL, standard, no mod's.
I'm thinking about pushing my wheel sizes up.
Now -
Front: 225/45-18, wheel 7.5X18
Back: 255/35-18, wheel 9X20

Proposed -
Front: 235/40 or 45, or 245/40, 45 or 50 (245 is max a 7.5 can take)
Back: 275/40 or 45 (275 is max for a 9)

I know this will throw my speedometer scale out the window. I will need to put in hard stops for the wheel turning movement (ratio will be reduced to prevent rubbing).
Also, I've been considering increasing the wheels and pushing the tires even further - maybe/maybe not. Maybe just increasing the wheels will be enough.
I used 275's on the OEM rear of my 16.5. I can't remember if I went with 40 or 45. It made only couple miles diff in speedo.
On my '18, I went from 305 to 315 and speedo is 1 mile off.
 

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Discussion Starter #4
2016.5 SL, standard, no mod's.
I'm thinking about pushing my wheel sizes up.
Now -
Front: 225/45-18, wheel 7.5X18
Back: 255/35-18, wheel 9X20

Proposed -
Front: 235/40 or 45, or 245/40, 45 or 50 (245 is max a 7.5 can take)
Back: 275/40 or 45 (275 is max for a 9)

I know this will throw my speedometer scale out the window. I will need to put in hard stops for the wheel turning movement (ratio will be reduced to prevent rubbing).
Also, I've been considering increasing the wheels and pushing the tires even further - maybe/maybe not. Maybe just increasing the wheels will be enough.
Correct the backs are 20.
 

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Going from 305 to 315, could you really see any improvement in any way ??
Thanks
No, I can't tell any diff....only went with a 315 because there were considerably more choices of tires. Rode some today and rechecked speedo with gps; they usually read same, sometimes the gps number would flip back and forth. Guessing the true speed is about 1/2 mile faster than gps.
 

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No, I can't tell any diff....only went with a 315 because there were considerably more choices of tires. Rode some today and rechecked speedo with gps; they usually read same, sometimes the gps number would flip back and forth. Guessing the true speed is about 1/2 mile faster than gps.
Thank you.
 

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Discussion Starter #11
Thanks for all the inputs and correction.
The snow has come, time to hibernate the SS for a little while. Guess the tires will have to wait.
 

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For what it's worth, here's what I ended up picking for my 2016 S:
Yokohama Advan Neova AD08R 295/30 R18 94W

I went as wide as my research indicated reasonable. I'd gotten 5,600 miles out of the original tire, and I've now still got a lot of tread left after 4,200 miles on this one, so it's holding up better. I'm also happy with the traction of the new tire.
 
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