285/75/17s on a Black Diamond NON Sasquatch?

[PolarVortex]

1. Are spacers absolutely necessary when getting the larger tire? If I'm keeping the stock steelies I mean......
No spacers required for going to the Toyo OC AT3 tires on stock wheels. Crash bars don't need removed either. You may get a tiny amount of rub on your sway bar - see photos above - not a concern for me.

2. Why would you trim the studs if you're putting on a spacer? Doesn't that make it so the studs are even less engaged with the lugnuts? I must be missing something here.
There are two styles of spacers. Thin spacers (<1") just have holes that allow them to fit over the wheel suds. Your lug nuts then thread to existing studs, but will have less thread to engage with (see photo above)
Thicker spacers have their own studs and a pocket to for a nut to secure them on to the existing studs. In the case of the Bronco, the studs on the rear wheels are longer than the front so if using a 1" spacer they will protrude a bit beyond the spacer to wheel mating surface. This is ok for alloy wheels that have a pocket on the backside. The steel wheels have no pocket and the protruding studs would interfere with the wheel. A 1.25" spacer will not have this issue. See a few photos below of a 1" spacer from this thread: Anyone running 1 inch wheel spacers? | Page 4 | Bronco6G - 2021+ Ford Bronco & Bronco Raptor Forum, News, Blog & Owners Community

3. After putting on the larger tire, is recalibrating the speedometer with Forscan required?
Not required, but your speedo, odometer and mpg calcs will be off by about 6%. I used Forscan to adjust to match GPS speed.

4. Leveling/lifting required at all? I want to avoid doing too much modifying.
Nope, that's the best part about this tire size: It is truly plug and play. Just install them and no other mods needed. It brings the non-sas Black Diamond right near the capability of the Badlands and sas models. Your ride height will be the same as a badlands and only 1.5" lower than a sasquatch. And since the badlands is on 33s, you'll have about a half inch more clearance under the axles.

Thanks to Scott, GiJo, redone, etc for all the info and photos.

Outstanding and thanks for the pics. I didn't realize there were spacers that came with their own studs so now everything makes total sense. Thanks for going into such detail!

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[GI_Jo_Nathan]

Thinking about getting the 285/75R17 Toyo tires after my General Grabbers are done and I've been through this thread a few times. I plan on keeping the steelies as I really like them. Just wanted to clarify a few things that are unclear to me:

1. Are spacers absolutely necessary when getting the larger tire? If I'm keeping the stock steelies I mean......

2. Why would you trim the studs if you're putting on a spacer? Doesn't that make it so the studs are even less engaged with the lugnuts? I must be missing something here.

3. After putting on the larger tire, is recalibrating the speedometer with Forscan required?

4. Leveling/lifting required at all? I want to avoid doing too much modifying.

Thanks to Scott, GiJo, redone, etc for all the info and photos.

Yep everything @Scott M said.
Yes I have only ever run quality bolt on spacers. I've never had a problem.

For me the spacers are mostly cosmetic. I did the spacers originaly when I had the Grabbers still to try to hold me over and not upgrade yet, but still make it look better and not as sunken in.

My tires now are 275/80-17 Milestar Patagonia XT's. Being so narrow I think they still look better with the spacers. I may do the KBD squared flares in the future and pull the spacers off. Only thing holding be back is the price, and the poor fitment most seem to have with them.

 

[PolarVortex]

Yep everything @Scott M said.
Yes I have only ever run quality bolt on spacers. I've never had a problem.

For me the spacers are mostly cosmetic. I did the spacers originaly when I had the Grabbers still to try to hold me over and not upgrade yet, but still make it look better and not as sunken in.

My tires now are 275/80-17 Milestar Patagonia XT's. Being so narrow I think they still look better with the spacers. I may do the KBD squared flares in the future and pull the spacers off. Only thing holding be back is the price, and the poor fitment most seem to have with them.

Ok cool. That’s a good idea to try the spacers with the Grabbers first. I only have 8k on them. And to be clear, if I do the spacers… do I get 1” for front and 1.25” for rear? Or 1.25” for all 4? I don’t want to cut any studs. Thanks!

 

[GI_Jo_Nathan]

Ok cool. That’s a good idea to try the spacers with the Grabbers first. I only have 8k on them. And to be clear, if I do the spacers… do I get 1” for front and 1.25” for rear? Or 1.25” for all 4? I don’t want to cut any studs. Thanks!

Would probably be best to do 1.25" all the way around. They will be easier to find in sets of four. I happened to get a great deal on these 1" spacers so I just made them work.

 

[sundaeman]

HUGE help. That is great thanks. I'll look into the FP 2" lift - can you send a pic of yours with the lift?

All I got at the moment.

 

[Reidt131]

Just had a set of the 285/75R17 LR C Toyo Open Country A/T III installed on our 2023 Black Diamond 2.3L Auto last week. I am very happy with how they look and feel. We put 600 miles on them already in a variety of conditions (snow, ice, gravel, rain, pavement) and here some thoughts:

Big thanks to those of you (@PootsBronco @redone17 @Moto26 @BlkDiamondintheRough and others) that provided the photos and information which helped me make the decision. (And thanks @Discount Tire!)

My main concern prior to driving on them was the additional weight of the 34" Toyos compared to the 31" Grabbers. At a little more than extra 12lbs per tire, I knew that was going to be noticeable, but didn't know how much so. I was happy to find that the additional weight doesn't detract much at all from the driving dynamics. Yes, you can feel the extra weight but it balances out the ride a bit better (feels more planted and softer over bumps) and the additional inertia on the drivetrain has the benefit of smoothing out the 10-spd's shifting. The Bronco overall now feels a bit less sports SUV and more like a truck, but I think it suits the vehicle's character a bit more and the tires now feel better matched to the heft of the chassis. It took about 3 days to get used to the new dynamics and after a week it feels perfectly normal. Main difference is slightly more brake pedal pressure to come to a stop, slightly more throttle to get up to speed, and slightly more steering effort when cornering.

I'm running them at 35psi cold and recalibrated the speedo with Forscan (I used 2565 for Tire Circumference (mm) and it is dead-on with my gps at 70mph)

The 2.3 with the 10spd and 4.46 gears has plenty of power and accelerates and cruises at 80mph (or above) effortlessly. Looks like we lost about .5 to 1 mpg.

The OC AT3s roll more smoothly than the Grabbers with less overall vibration. They aren't necessarily quieter, but their noise on the highway is in a higher frequency band which makes the tire noise less intrusive when talking or listening to music. They also pick up and throw much less gravel. They drive as well, if not better, than the Grabbers in wet or dry and felt very surefooted in the snow and ice we just had in the northwest.

Oh and they look great too! What is only about 1" of ride height difference looks and feels 3" when standing next to it or from the driver seat. Photos don't do them justice either- they appear much larger in person with a nice sidewall bulge and aggressive side lugs and tread pattern. Perfectly completes the look of the Black Diamond steel wheels in my opinion - it's sitting pretty now with no other mods.

Some photos:

Do you think you could measure the diameter of these tires for me? Planning to run this exact combo, but I've heard that the Toyos run a bit smaller than other brands. Maybe that is how you can run them without crash bars removed?

 

[Moto26]

Do you think you could measure the diameter of these tires for me? Planning to run this exact combo, but I've heard that the Toyos run a bit smaller than other brands. Maybe that is how you can run them without crash bars removed?

From Toyo's own website: 285/75-17 Open Country ATIII Load C = 33.9" inflated diameter...

open-country-at3

 

[Scott M]

Do you think you could measure the diameter of these tires for me? Planning to run this exact combo, but I've heard that the Toyos run a bit smaller than other brands. Maybe that is how you can run them without crash bars removed?

My spare measures 33.75" at 35psi using two straight edges.

 

[Reidt131]

From Toyo's own website: 285/75-17 Open Country ATIII Load C = 33.9" inflated diameter...

open-country-at3

Yeah, my concern was that they run undersize compared to the claimed size.

Based on Scott's post it isn't an issue

 

[Reidt131]

My spare measures 33.75" at 35psi using two straight edges.

Perfect thanks!

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