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What size tires do I need for 18" wheels?

Venom

Member
May 29, 2019
307
165
Chicago, IL
Purchasing these 18" wheels from Martian Wheels. They recommend I use 235/55/R18 tires, but I saw conflicting information on the forum saying that 255/50R18 is the correct tire size. I would hope the manufacturer of the wheels is correct.
 

ChewTypeR

Member
Jan 29, 2021
29
30
Canada
For the two sizes you listed it really comes down to the wide of the rim. So if Martian recommended 235, what is the width of the wheel you are getting?
255 is the stock width generally 9-10inch width
 

wackojacko

Member
May 17, 2018
38
19
Toronto
The wheel size is 18 x 8.5” +35

How do you convert that to the correct tire size?
those rims are 1" narrower than the OE 19", They are same size I'm looking to get next winter. I think the 235 makes more sense, the 235 mean the tire is 235 millimeters wide at the tread (I'm from Canada, yeah Metric System) and the OE is 255. So that's 20 Millimeter narrower, or about 12.6/16 of an inch for my US Friends. so a narrower tire is better on the 8.5" rims.
 
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Venom

Member
May 29, 2019
307
165
Chicago, IL
those rims are 1" narrower than the OE 19", They are same size I'm looking to get next winter. I think the 235 makes more sense, the 235 mean the tire is 235 millimeters wide at the tread (I'm from Canada, yeah Metric System) and the OE is 255. So that's 20 Millimeter narrower, or about 12.6/16 of an inch for my US Friends. so a narrower tire is better on the 8.5" rims.
Oh awesome. So if it’s narrower it’ll likely perform better in the snow? Also it’ll get better range because of less rolling resistance, etc?
 

ChewTypeR

Member
Jan 29, 2021
29
30
Canada
I just want to top up with is 18s will look really small.. and handling might feel a little "floaty". I have the performance as well but went with 19s 255/45/19 for winter and 20s 255/40/20 for summer. The 21s are in permanent storage haha
20210304_194756.jpg
20210305_162750.jpg
 
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