USING SIZE 235/35-19 FOR EXAMPLE

The dimensions of a 235/35-19 tire are

9.3” wide (section width) & 25.5” tall (outside dia)

The section width is 235mm wide

(There are 25.4mm to an inch)

STEP 1) 235mm divided by 25.4” = 9.25” (section width)

STEP 2) Multiply 9.25 (section width) by .35 (aspect ratio)

9.25 x .35 = 3.24” (section height)

To find the outside diameter

Multiply 3.24 (section height) x 2 then add rim diameter

STEP 3) 3.24” x 2 = 6.48” + 19.0” = 25.48” round out to 25.5  (outside dia)

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16 Responses to Formula for Calculating Tire Dimensions

    • Those aren’t too wide, but might be too tall. A 235/50R17 will fit without issue, and it has a 27.2″ outside diameter. The 235/60R17 has a 28.1″ outside diameter. It might work, but it may rub in he fenders.

  1. I have a ’16 Toyota Tundra and I . just put on fender flairs, I’m looking to get new tires and I would like to go a bit wider and taller. I currently have Bridgestone 275/55R20 111H. What size tire would you recommend?

  2. I am looking to buy 605 ridler 17″by 7″ with 4.5 bs front and 18″by 8″ with 4.5 bs rear wheels with Hankook 255/40zr17 front and 275/35/zr18 rear tires so i used a tire calculator and came up with 25″ tire height on front and 25.6″ tire height on rear
    I currently have p235 60 14 on 14″ wheels now and tire calculator comes out to 25.1″ for tire height on all four.
    With those calculations would the ridler wheels and tire combination work

  3. I want to know how big I can get before I rub the wheel wells. I have 50 inches between. And I’m planning on staying with the original 17″ rims. I also have a 6.5″ bds suspension lift. It sits on 37s now but would like to get bigger. What is the biggest I can go before I rub?

  4. Anyone know how i calculate the tire size when chnanging to a super single from dual rear wheels? I have Two “225/70-19.5” load range “G” tires on the back.

  5. My 2004 jeep liberty calls for 215/75/16 tires. THe only ones I can find are kumho, not big fan of those. what other size can I use on my jeep. I do have a bit of sag in front suspension.

  6. I want to order wheels and tires for a Versa 2011 from Nissan 1.8L S hatchback but upgrade with tires 205/45R17 and wheels 17 inches by 7width holes 4×100/4×4.5 and 40 mm offset is that correct? If so do you sell spacers to mount them?

  7. I have. 1962 Chevy Impala ss and would like to put 17×7 riddlers on it .Will they fit and what tires do you recommend.

  8. Hello, im looking for a set of rims and tires and I want the absolute widest rim and tire that i can stuff in the wheel wells could you possibly help me with this i want them for a 1987 corvette c4 thank you for your help on this matter i would like an 18″ rim if possible but open to your advice thanks again, Steve

  9. I have a 1956 Ford Thunderbird with
    15X8″ chrome reverse rims
    Will a 185 tire work on that rim on my car??

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