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Discussion Starter #1 (Edited)
TIRE SIZE WITH LIFT KITS:

Note: These recommendations are based on the factory wheels. Using an upgraded rim with different backspacing will allow you to increase to a wider tire.

First Gen Tundra

No Lift Kit

Max tire sizes are:

16″ rims: 275/70 R16 – 4/10ths wider, half-inch taller than largest factory tire size
17″ rims: 265/70 R17 – one inch taller but same width as factory
17″ rims: 275/65 R17 – 4/10ths wider, half-inch taller than largest factory tire size
1.5 – 2″ Leveling Kit (or less)

When installing a leveling kit, you might be able to fit some wider tires than what we have listed. It may require some trimming though, but it is possible.

Max tire sizes are:

16″ rims: 265/75 R16 – one inch taller but same width as factory
17″ rims: 275/70 R17 – 1.5 inches taller and 4/10ths wider than factory

3″ Lift Kit

With a 3″ lift kit, the options continue to get better. However, the wider the tire, the greater the likelihood of trimming.

Max tire sizes are:

16″ rims: 285/75 R16 – slightly more than 2″ taller than factory, this tire is 8/10ths wider than factory as well. This width may be problematic in tight turns and/or at full suspension compression.
16″ rims: 265/80 R16 – an oddball size, this tire is the same width as the factory but more than 2″ taller
17″ rims: 285/70 R17 – slightly more than 2″ taller than factory, this tire is 8/10ths wider than factory as well. This width may be problematic in tight turns and/or at full suspension compression.

Second and Third Gen Tundra

No Lift Kit

Max tire sizes are:

18″ rims: 285/65 R18 – 5/10ths taller and 4/10ths wider than factory. Trimming may be necessary.
20″ rims: 275/60 R20 – one inch taller but same width as factory
1.5 – 2″ Leveling Kit (or less)
When installing a leveling kit, you might be able to fit some wider tires than what we have listed. It may require some trimming though, but it is possible.

Max tire sizes are:

18″ rims: 275/70 R18 – One inch taller but same width as factory.
18″ rims: 285/70 R18 – 4/10ths wider and 1.7 inches taller than factory. Trimming may be necessary.
18″ rims: 295/65 R18 – 1 inch taller, 8/10ths wider than factory. Trimming is probably needed due to width.
20″ rims: 285/60 R20 – 4/10ths wider and 1.5 inches taller than factory.

3″ Lift Kit

With a 3″ lift kit, the options continue to get better. However, the wider the tire, the greater the likelihood of trimming.

Max tire sizes are:

18″ rims: 285/75 R18 – 4/10ths wider and 2.8″ taller than factory.
18″ rims: 305/70 R18 – 1.2 inches wider and 2.8″ taller than factory. There are Tundra owners running this size, but trimming is required. Replacing the stock wheels with after-market 18′s that have less backspacing is recommended.
20″ rims: 285/65 R20 – 4/10ths wider, 1.6″ taller than factory.
20″ rims: 305/60 R20 – 1.2 inches wider and 2.4″ taller than factory. There are Tundra owners running this size, but trimming is required (it’s a tight fit).
 

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A 12.50 wide tire is too wide for the stock rims. You will get sub par wear. There are a few guys that run them you have to go 3" on the front and do lots of plastic reshaping. , bmc, and maybe space out the bumper

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