Tire diameter list - Toyota Yaris Forums

grampi · 06-03-2007, 08:56 AM

Since a lot of folks are interested in going with "plus" size tires and wheels, I thought I'd post the overall diameter of some of the more popular sizes, along with the OEM sizes.

OEM

175/65/14 = 22.92"

185/60/15 = 23.7"

Plus sizes

195/50/16 = 23.64"

205/45/16 = 23.23"

205/50/16 = 24.03"

205/45/17 = 24.23"

205/40/17 = 23.43"

What has me a bit puzzled is the disparity between the two OEM sizes. That's .8" difference in overall diameter, which is quite a bit. You'd think Toyota would've wanted those two numbers a bit closer together.

I have narrowed my chioces down to to either 16" or 17" wheels. If I go with 16s, my tire size will probably be 205/45/16. If I go with 17s, my tire size will probably be 205/40/17. I was also considering 195s until I saw what a poor selection of tires are available in that size. The best selection is in the 205 size.

I haven't decided between 16s or 17s, and I really don't know what factors are going to help me with this decision. The number of tire chioces are roughly the same in both sizes. I may be leaning toward the 16s as their somewhat taller sidewall may offer a bit smoother ride, but am I really going to be able to tell the difference between a 45 and a 40 series tire in terms of ride comfort? Both have very short and stiff sidewalls.

If anyone would like to do their own figuring, here's the formula:

tire width * aspect ratio * 2 / 2550 + wheel diameter = overall diameter

or

205 * 45 * 2 / 2550 + 16 = 23.23"

brickhardmeat · 06-03-2007, 09:47 AM

am I really going to be able to tell the difference between a 45 and a 40 series tire in terms of ride comfort?

yes

grampi · 06-03-2007, 11:02 AM

Quote:

Originally Posted by brickhardmeat

am I really going to be able to tell the difference between a 45 and a 40 series tire in terms of ride comfort?

yes

Care to expound a bit?

SailDesign · 06-03-2007, 11:12 AM

Quote:

Originally Posted by grampi

If anyone would like to do their own figuring, here's the formula:

tire width * aspect ratio * 2 / 2550 + wheel diameter = overall diameter

or

205 * 45 * 2 / 2550 + 16 = 23.23"

Make that 2540, not 2550, so the final diamater is 23.26", and you've nailed it!

Or - just use the spreadsheet to compare sizes

Doc Zaius · 06-03-2007, 11:25 AM

Or check out the first couple posts of the Official Tire guide... this has been talked about.

brickhardmeat · 06-03-2007, 12:27 PM

Quote:

Originally Posted by Doc Zaius

Or check out the first couple posts of the Official Tire guide... this has been talked about.

yeah see the official tire guide

and you -will- feel a difference from 45 down to 40

I'm very please with a 205/50/15

I also like using this for comparisons ...http://www.miata.net/garage/tirecalc.html

grampi · 06-03-2007, 12:29 PM

Quote:

Originally Posted by SailDesign

Make that 2540, not 2550, so the final diamater is 23.26", and you've nailed it!

Or - just use the spreadsheet to compare sizes

According to this it's 2550:

http://oly4x4.com/metrictireconv.htm

grasshopper · 06-04-2007, 04:03 AM

Sail is right. 1 inch = 25.4mm. so the height formula should use 2540. But, 3/100" discrepency is nothing to cry about.

06-03-2007, 08:56 AM	#1
grampi Drives: Corolla Join Date: May 2007 Location: Ohio Posts: 325	Tire diameter list Since a lot of folks are interested in going with "plus" size tires and wheels, I thought I'd post the overall diameter of some of the more popular sizes, along with the OEM sizes. OEM 175/65/14 = 22.92" 185/60/15 = 23.7" Plus sizes 195/50/16 = 23.64" 205/45/16 = 23.23" 205/50/16 = 24.03" 205/45/17 = 24.23" 205/40/17 = 23.43" What has me a bit puzzled is the disparity between the two OEM sizes. That's .8" difference in overall diameter, which is quite a bit. You'd think Toyota would've wanted those two numbers a bit closer together. I have narrowed my chioces down to to either 16" or 17" wheels. If I go with 16s, my tire size will probably be 205/45/16. If I go with 17s, my tire size will probably be 205/40/17. I was also considering 195s until I saw what a poor selection of tires are available in that size. The best selection is in the 205 size. I haven't decided between 16s or 17s, and I really don't know what factors are going to help me with this decision. The number of tire chioces are roughly the same in both sizes. I may be leaning toward the 16s as their somewhat taller sidewall may offer a bit smoother ride, but am I really going to be able to tell the difference between a 45 and a 40 series tire in terms of ride comfort? Both have very short and stiff sidewalls. If anyone would like to do their own figuring, here's the formula: tire width * aspect ratio * 2 / 2550 + wheel diameter = overall diameter or 205 * 45 * 2 / 2550 + 16 = 23.23"

06-03-2007, 09:47 AM	#2
brickhardmeat Lonesome Cowboy View User's Garage Drives: 2007 WHITE HATCHBACK Join Date: Feb 2007 Location: Inner City, Dallas Posts: 2,995	am I really going to be able to tell the difference between a 45 and a 40 series tire in terms of ride comfort? yes __________________ SPONSORED BY

06-03-2007, 11:25 AM	#5
Doc Zaius Lurker supreme! View User's Garage Drives: old and boosted! Join Date: Nov 2006 Location: Ottawa, ON, Canada Posts: 792	Or check out the first couple posts of the Official Tire guide... this has been talked about. __________________ 2006 Red Blitzed RS 5-door

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06-04-2007, 04:03 AM	#8
grasshopper Drives: 2007 VW GTI Join Date: May 2007 Location: Phoenix, AZ Posts: 3	Sail is right. 1 inch = 25.4mm. so the height formula should use 2540. But, 3/100" discrepency is nothing to cry about.