Wheels Specs - Bolt Pattern / Offset? Tire Size Change Via App?

[5ohbrad]

You asked a good question. Unfortunately there's no way the answer will turn out to be true.

Presumably the Slate Truck, being an EV, was range-tested while equipped with stock-sized "EV tires" that have been engineered for low rolling resistance.

Tire rolling resistance affects range severely. According to the EPA (so it must be true! ) rolling resistance can account for up to 23% of lost energy efficiency in EVs. Tire manufacturers claim that "EV" tires can reduce rolling resistance by 10-20%.

All-Terrain tires are inherently heavier. The extra weight is "rotating mass". Extra rotating mass also lowers range. For reference, one pound of rotating weight is considered equivalent to about three to ten pounds of static weight.

Increasing tire diameter also has a gearing effect that negatively affects range, performance, ride quality, and parts wear-and-tear. More about that is in this post.

My wishful thinking is that they were seeking 150 miles of range with the 32” tires which would obviously indicate a much higher range on standard tires. We will have to wait and see.

 

[AZFox]

My wishful thinking is that they were seeking 150 miles of range with the 32” tires which would obviously indicate a much higher range on standard tires. We will have to wait and see.

The agents' tendency is to be optimistically encouraging, sometimes to a fault.

My wishful thinking was that I could install light and narrow All-Terrain tires on 16-inch wheels. The first two times I asked, they said "yes". The third time I was very specific about whether the 16-inch wheel would fit. It won't.

I turns out that swapping to different tires can influence range tremendously. The agent probably isn't aware of that.

 

[AZFox]

Wow, educational for me. Efficiency over style 😁

"There ain’t no such thing as a free lunch."
--Milton Friedman

If efficiency is your bag, All-Terrain tires aren't for you.

 

[AZFox]

All-Terrain are mostly decorative on the Slate Truck because the chassis will be too stiff and the suspension travel will be too short for doing any serious off-roading.

Something to note:
The All-Terrain tires Slate Auto has been showing us are not 32-inch tires. They're 31-inchers.

Even if 32s somehow fit, they trade away far too much IMHO.

Information about an "actual 32-inch" tire size that fits on 17-inch wheels is in this post and it's comparison-visualized in this post.

235/75R17 (30.9" x 9.3") appears to be the "Goldilocks" All-Terrain tire size because

• it's not super heavy
• it's not especially wide (helps with rolling resistance)
• It's only slightly taller than the stock tire (+0.4" diameter)
• It's available in an appropriate Load Range

If that size doesn't require the Lift Kit it's all the better.

Comparison screenshots for 245/75s are in this post.