Offset Vs Wheel Width

[grizzlyoutlaw]

After choosing the rim style the biggest question seem to be how to get the desired level of poke out from the truck. I see alot of comparison on offset but not as much regarding different wheel widths. The consesus seems to be that stock TRD Offroad wheels are 7.5" wide with a +55 Offset. In american that 55mm is approx 2.16". If you were to get aftermarket wheels that are also 7.5" wide with 0 Offset, you will now be poked out 2.16" more. However, its more common to see wider wheels in the aftermarket. Here is where I would like someone to check my math. If you got an 0 offset rim that is now 8.5" wide, that is 1" wider than stock. Since the rim splits the width between inner and outer you are increasing the poke by .5" for the wheel and 2.16" for the offset and now are at 2.56" poke. Also, the LT265/70R17 has a tire section width of 10.7" and moving up to a LT286/79R17 has a section width of 11.5" for an added .8". Divide that by two because like the rim, tires poke on both sides that adds .4" to the sectional tire poke for a total of 2.96". The actual tread width is only .5" total more but I wanted true full poke. So when comparing options, offset has the biggest effect but those other factors could cause some variations. Does all of that add up?

FYI Icon's recommeded combo is 17" x 8.5" 25 MM Offset and LT285/70R17 youtube link for a total poke at side wall of just over 2". (1.19" offset - .5" wheels - .4" wider sidewall)

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[bigd9247]

I've noticed that a 17x9 wheel with 0 offset will list 5.00" of backspacing, while a 17x8.5 wheel with 0 offset will list 4.75" of backspacing. So I think your math makes sense.

There are some helpful calculators on this website: https://tiresize.com/wheel-offset-calculator/

 

[WKTJR1]

After choosing the rim style the biggest question seem to be how to get the desired level of poke out from the truck. I see alot of comparison on offset but not as much regarding different wheel widths. The consesus seems to be that stock TRD Offroad wheels are 7.5" wide with a +55 Offset. In american that 55mm is approx 2.16". If you were to get aftermarket wheels that are also 7.5" wide with 0 Offset, you will now be poked out 2.16" more. However, its more common to see wider wheels in the aftermarket. Here is where I would like someone to check my math. If you got an 0 offset rim that is now 8.5" wide, that is 1" wider than stock. Since the rim splits the width between inner and outer you are increasing the poke by .5" for the wheel and 2.16" for the offset and now are at 2.56" poke. Also, the LT265/70R17 has a tire section width of 10.7" and moving up to a LT286/79R17 has a section width of 11.5" for an added .8". Divide that by two because like the rim, tires poke on both sides that adds .4" to the sectional tire poke for a total of 2.96". The actual tread width is only .5" total more but I wanted true full poke. So when comparing options, offset has the biggest effect but those other factors could cause some variations. Does all of that add up?

FYI Icon's recommeded combo is 17" x 8.5" 25 MM Offset and LT285/70R17 youtube link for a total poke at side wall of just over 2". (1.19" offset - .5" wheels - .4" wider sidewall)

I plugged your post into a chatbot and here's the results:

Your calculations are mostly correct, but let's break it down step by step to ensure clarity and accuracy. We'll start with the basic formulas and then apply them to the scenarios you've described.

Stock Wheel Setup

• Stock Wheel Width: 7.5 inches
• Stock Offset: +55 mm (approximately 2.16 inches)
• Stock Tire Width (LT265/70R17): 10.7 inches

Aftermarket Wheel Setup (Example 1)

• New Wheel Width: 8.5 inches (1 inch wider than stock)
• New Offset: 0 mm

Calculation of Poke
Step 1: Offset Poke

• Stock Offset Poke: 2.16 inches
• New Offset: 0 mm
• Change in Offset Poke: 2.16 inches−0 inches=2.16 inches2.16 inches−0 inches=2.16 inches

Step 2: Wheel Width Poke

• Stock Wheel Width: 7.5 inches
• New Wheel Width: 8.5 inches
• Difference in Width: 8.5 inches−7.5 inches=1 inch8.5 inches−7.5 inches=1 inch
• Since the wheel splits the additional width equally inside and outside, the additional poke is: 1 inch/2=0.5 inch1 inch/2=0.5 inch

Total Poke from New Wheel Setup

• Total Poke from Offset and Width: 2.16 inches+0.5 inch=2.66 inches2.16 inches+0.5 inch=2.66 inches

Step 3: Tire Width Poke

• Stock Tire Width (LT265/70R17): 10.7 inches
• New Tire Width (LT285/70R17): 11.5 inches
• Difference in Tire Width: 11.5 inches−10.7 inches=0.8 inch11.5 inches−10.7 inches=0.8 inch
• Since the tire width also splits equally inside and outside, the additional poke is: 0.8 inch/2=0.4 inch0.8 inch/2=0.4 inch

Total Poke Including Tire

• Total Poke Including Tire: 2.66 inches+0.4 inch=3.06 inches2.66 inches+0.4 inch=3.06 inches

Comparison with Icon's Recommendation

• Icon's Wheel Width: 8.5 inches
• Icon's Offset: +25 mm (approximately 0.98 inches)
• Icon's Tire Width (LT285/70R17): 11.5 inches

Step 1: Offset Poke

• Change in Offset Poke: 2.16 inches−0.98 inches=1.18 inches2.16 inches−0.98 inches=1.18 inches

Step 2: Wheel Width Poke

• Difference in Width: 8.5 inches−7.5 inches=1 inch8.5 inches−7.5 inches=1 inch
• Additional Poke: 1 inch/2=0.5 inch1 inch/2=0.5 inch

Total Poke from Icon's Setup (Wheel Only)

• Total Poke from Offset and Width: 1.18 inches+0.5 inch=1.68 inches1.18 inches+0.5 inch=1.68 inches

Step 3: Tire Width Poke

• Additional Poke from Tire Width: 0.4 inch0.4 inch

Total Poke Including Tire (Icon's Recommendation)

• Total Poke Including Tire: 1.68 inches+0.4 inch=2.08 inches1.68 inches+0.4 inch=2.08 inches

Summary

• Your Calculation for 8.5" Wheel with 0 Offset and LT285/70R17 Tire: 3.06 inches poke
• Icon's Recommendation for 8.5" Wheel with +25 mm Offset and LT285/70R17 Tire: 2.08 inches poke

So your math checks out, and it illustrates that offset has the most significant impact on poke, followed by the width of the wheel and tire. The combination you calculated results in a larger poke compared to Icon's recommendation due to the difference in offset.

 

[grizzlyoutlaw]

Glad there's a summary there at the end. Thank you for checking. I have Rough Country extended fenders on order and they are 1.5" more tire coverage than stock but won't say if thats how much wider they are. Looks like 11.5" wide tires are the sweet spot and available from 31" to 35". Pair that with 8.5 rims and you are at 3" poke on 0 offset. Negative offset sends you way out.

 

[robfultz]

I have been trying to confirm my offset on a stock 2024 Tacoma off road.
I pulled the tire and have these markings on the inside. I have heard both 55 & 62 for the offset.
Markings are: 55, CNP, JDOT, Mex, 62 CM, 23/12, 7 x 7 1/2.

It has both 55 & 62...which is the offset"

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