Spare Tire with 285s

rmarqu2 · May 13, 2010

I'm still running my stock spare. I'm saving up for a tiregate so I can sport the baja MTZ spare on the outside. But i'll be saving for awhile!!

steve o 77 · May 13, 2010

crazybayman said: ↑

Fellas, if you want to calculate the height (outer diameter) of your tires, do this:

Consider a 265/75/16 Tire. The tread width is 265 mm, aspect ratio of sidewall height to width is 0.75 (that's the 75), and the rim diameter is 16 inches. Bear in mind that 1 inch is 25.4 mm.

To calculate the tire OD, or height in inches:

265 mm x 0.75 = 198.75 mm this is your sidewall height

Rim diameter is 16", therefore radius is 8 inches. To convert to millimeters, 8 inches x 25.4 mm/inch = 203.2 mm

Add these two together to get the tire radius: 203.2 mm + 198.75 mm = 401.95 mm.

Multiply this by 2 to get the tire's outer diameter (which is the tire height) in millimeters: 401.95 mm x 2 = 803.9 mm

Divide this by 25.4 mm/inch to covert to inches: 803.9 mm / 25.4 mm per inch = 31.6 inches

Do this for a 265/70/17 tire, and you'll wind up with a height of 802.8 mm, which is also 31.6 inches

Follow these same formulae, and you can find which sizes of spare tires will match whatever tires you're running.
Click to expand...

Or... you can use the magic of the internet
http://www.tacomaworld.com/forum/tirecalc.php

The_Hodge · May 13, 2010

crazybayman said: ↑

Fellas, if you want to calculate the height (outer diameter) of your tires, do this:

Consider a 265/75/16 Tire. The tread width is 265 mm, aspect ratio of sidewall height to width is 0.75 (that's the 75), and the rim diameter is 16 inches. Bear in mind that 1 inch is 25.4 mm.

To calculate the tire OD, or height in inches:

265 mm x 0.75 = 198.75 mm this is your sidewall height

Rim diameter is 16", therefore radius is 8 inches. To convert to millimeters, 8 inches x 25.4 mm/inch = 203.2 mm

Add these two together to get the tire radius: 203.2 mm + 198.75 mm = 401.95 mm.

Multiply this by 2 to get the tire's outer diameter (which is the tire height) in millimeters: 401.95 mm x 2 = 803.9 mm

Divide this by 25.4 mm/inch to covert to inches: 803.9 mm / 25.4 mm per inch = 31.6 inches

Do this for a 265/70/17 tire, and you'll wind up with a height of 802.8 mm, which is also 31.6 inches

Follow these same formulae, and you can find which sizes of spare tires will match whatever tires you're running.
Click to expand...

OR....you click on the tire size calculator on the site

http://www.tacomaworld.com/forum/tirecalc.php

The_Hodge · May 13, 2010

steve o 77 said: ↑

Or... you can use the magic of the internet
http://www.tacomaworld.com/forum/tirecalc.php
Click to expand...

aaaahahahahaha...almost identical and at the exact minute

steve o 77 · May 13, 2010

jhodge83 said: ↑

aaaahahahahaha...almost identical and at the exact minute
Click to expand...

lol, I had a feeling someone else was going to post that.

The_Hodge · May 13, 2010

steve o 77 said: ↑

lol, I had a feeling someone else was going to post that.
Click to expand...

i had to go back and actually compare our posts b/c i thought i may have edited your post...lol

TRICOMA · May 13, 2010

wiscdave said: ↑

Depends on what you want it for?

If your out of town on a trip on a Sunday..good luck with finding a 33 to get home on.

If you live in Bumblefug Egypt...good luck.

If your out on the trail...good luck.

If your towing or have a full load (ATV) in the back...good luck.

IMHO better to have a full size, good condition spare that can get you out of jam. I've been put in that situation before with a crappy undersized spare and learned my lesson
Click to expand...

Agreed...I would get a spare to match. And that is what I have cause I am stock, but I have a 5th wheel so I will be buying 5 next time around. Why have a shitty spare when you are out on a trail and need a get back home.

crazybayman · May 14, 2010

steve o 77 said: ↑

Or... you can use the magic of the internet
http://www.tacomaworld.com/forum/tirecalc.php
Click to expand...

jhodge83 said: ↑

OR....you click on the tire size calculator on the site

http://www.tacomaworld.com/forum/tirecalc.php
Click to expand...

haha....true.

But it does help to have some idea of what the numbers mean, especially when your looking at tires, and not sat in front of your computer.

That, I can actually calculate it quicker than following a link or two to the tire size calculator tool.

Me: 1
Computer: 0

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Spare Tire with 285s

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Spare Tire with 285s

#41 rmarqu2 YES... i am a murse....

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#45 steve o 77 braaap

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#41
rmarqu2 YES... i am a murse....

#42
steve o 77 braaap

#43
The_Hodge Volunteer Moderator

#44
The_Hodge Volunteer Moderator

#45
steve o 77 braaap

#46
The_Hodge Volunteer Moderator

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TRICOMA Tacoma with the TRI package

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crazybayman Oh 'eah

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