Tire size question
Thread Starter
Advanced
Joined: Jun 2022
Posts: 66
Likes: 7
From: Las Vegas
Tire size question
I’ve read a lot of the previous questions/answers for tires, a bit confusing and sometimes conflicting. I only daily drive, no tracking, and have standard C6 rims. I want to upsize to 305s on the rear, and probably 255s on the front. For the 305s, is a 305/35/19 better than the 305/30/19 in terms of fit and height for the standard 10” rim? Thanks!
Drifting
Joined: Apr 2021
Posts: 1,935
Likes: 1,127
From: Peoria, AZ
2023 C6 of the Year Finalist - Modified
I run 305/35/ZR 19's on the rear.
305 is the width in millimeters. 30 or 35 is the aspect ratio (wall height) - 30% or 35% of the tire width. ZR is the speed rating. 19 is the rim diameter in inches.
Therefore...
305/30ZR/19 has a wall height of 3.6" (92mm)
305/35ZR/19 has a wall height of 4.2" (107mm)
This affects the overall diameter (& circumference) of the tire - your diameter and obviously circumference have grown (you can do the math from the different wall heights above). The 35 in opposition to the 30 will give a much better ride due to the increased wall height. Hope this helps.
305 is the width in millimeters. 30 or 35 is the aspect ratio (wall height) - 30% or 35% of the tire width. ZR is the speed rating. 19 is the rim diameter in inches.
Therefore...
305/30ZR/19 has a wall height of 3.6" (92mm)
305/35ZR/19 has a wall height of 4.2" (107mm)
This affects the overall diameter (& circumference) of the tire - your diameter and obviously circumference have grown (you can do the math from the different wall heights above). The 35 in opposition to the 30 will give a much better ride due to the increased wall height. Hope this helps.
Thread Starter
Advanced
Joined: Jun 2022
Posts: 66
Likes: 7
From: Las Vegas
Tire
Thanks! I’ve read a lot about the 305/30 being a bit wide for the 10” rim and squirming a bit when cornering, although for daily street driving not sure that’s a problem. Also tire diameter seems to possibly mess with traction control. Just a lot of variables. I’m looking at Nittos or Khumo tires btw.
Safety Car
Joined: Dec 2006
Posts: 4,587
Likes: 1,667
From: Pearland / Houston Tx
Tire Rack spec page was my go to site for looking up diameter and width for any size tire.
Not the size you are asking about, but I found a good price on rear 275-40-19s and the sizing seemed acceptable. But they rubbed in the fender well whenever I went through a good sized dip in the road.
Not the size you are asking about, but I found a good price on rear 275-40-19s and the sizing seemed acceptable. But they rubbed in the fender well whenever I went through a good sized dip in the road.
Melting Slicks
Joined: May 2020
Posts: 2,135
Likes: 1,309
From: North Little Rock, AR
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