BFGoodrich 255/85 R16 Tires

The Expeditions West Tacoma is not a “Rock Crawler,” and was designed for rugged, remote expedition travel in Mexico and throughout the Southwest.  I wanted a tire with good load carrying capacity, sidewall strength, tall section height for for ground clearance, and mud traction for our planned trips to the jungles of Guatemala and the outback of the Yukon Territory and Alaska.

My research led me to the position that a tall, yet narrow tire would be the best solution for my needs and provide the greatest performance in the terrain I travel.

Tacoma on White Rim Trail in Utah

The Expeditions West 2004 Tacoma on the White Rim Trail, Canyonlands Utah
 

Installation of the 255/85 R16s on a 2004 Tacoma Double Cab TRD

Summary

I chose this tire size even before I made my final vehicle selection.  The Expeditions West Tacoma is the first vehicle documented to run this tire size.  The 255/85 R16 (33.4×10.5 as measured) tire provides several performance advantages over the 33×12.5 or 285/75 R16 tire.

Tire Details

BF Goodrich Mud terrain KM, LT 255/85 R16/D 119Q (note: BFG site lists height as 33.3″ on a 7″ rim)BF Goodrich Mud terrain KM, LT 255/85 R16/D 119Q (note: BFG site lists height as 33.3″ on a 7″ rim)

Wheel Details

American Racing 797 16×8, 4″ backspacing

Words of Caution

I will start by saying the 255/85 is a large tire for the Tacoma with IFS and and full travel (no lowering of bumpstops, etc.), and is not a bolt-on endeavor. These tires measure 33.4″ tall, and are much taller than the typical 33. The picture on the right shows the BFG 255/85 R16 next to a BFG 33×10.5 R15. There is a 1.3″ difference in height between the two tires.

So what does that mean?  There are three critical items that need to be addressed when installing these tires:

  1. Fenderwell clearancing
  2. Relocation of the rear axle
  3. Regearing of the differentials

How Much Lift?

None is required to fit these tires on a Tacoma.

It is a common misconception that “lifting” the vehicle allows for fitment of larger tires. In reality, it is the increased fender clearance/trimming, wheel offset and relocation of the bumpstops that allows for the larger tires. The key is to fit as large a tire possible for ground clearance, while retaining maximum suspension travel for performance. Since the goal here is not to build a rock crawler, suspension performance takes a priority over tire height. I did change the suspension on the truck, which resulted in an increased suspension height of 1.5″ in the front and 2″ in the rear (vehicle at GVWR). The picture below shows the tires installed on the vehicle at stock height. As mentioned above, it is necessary to do heavy trimming, relocate the rear axle and use the correct offset wheel.

Picture taken post trimming, pre-lift.

Tacoma Pre-Lift

Suspension Selected

Components of this suspension won the Baja 1000 in 2004, and is of the highest build and ride quality.
Front: Donahoe standard length coils, set to 1.5″ lift, stock bumpstop height. These coil-over’s allow full stock travel with a 30% increase in spring rate, which helps to control the heavy tires and wheels. Rebound control is excellent, compression is somewhat firm, but secure. Swaybar is removed on this vehicle to allow full articulation.
Rear: Deaver custom 10 leaf pack with .5″ center pin adjustment to midline of truck. Expedition load height: 1.75-2.00″. The rear suspension is critical to fitting these tires, as the center pin MUST be moved forward .5″ to allow full compression or the tire will destroy the rear of the wheelwell. Shocks are Bilstein 5100, extended length.

All components are available from Demello Off-Road.

Tacoma lifted

 

 

Fender Trimming

I drove the truck for a few days with the larger tires installed to leave “witness marks” to show where the tires rubbed.  The rubbing is most evident on the rear splash guard of the front wheelwell.
Front Wheelwell

 

The first step is to trim the fender guard along the witness marks, which will expose the seam weld (also referred to as a pinch weld). I used a Dremel tool with a roto attachment to trim the plastic; though a sharp razor is also effective.

Pinch Weld

 

Weld Diagram Upper Main and Lower Pinch Weld

 

 

Start by bending a lower pinch weld proximal to the midline of the truck.
Bending Lower Pinch Weld
 

Pinch Weld Bent

Most that perform this modification just hammer the extra material flat.  I chose to cut it off completely.  Neither way is “better”, but cutting the extra material off is a little cleaner.

Trimming Material with Grinder

Material Trimmed Off

The next step is to start the main pinch weld bend using a crescent or similar.  Follow up by flattening the weld against the firewall using a large hammer.

Bending Main Weld with Crescent

Bending the Main Weld with a Hammer

Also flatten the rolled upper flange and address any other areas that show tire contact.  I needed to make several small corrections to the area left of the upper rolled flange.

Rolled Upper Flange

I finished the job by painting the areas hammered, and then undercoating the wheelwell.

The next critical step is to replace all of the fender flare mounting bolts (the black ones with the raised hex head) with fender washers and screws.  This arrangement sits nearly flush with the flare, reducing contact with the tire lugs.

Fender Washers and Screws Flush

The next step is to ID chamfer all of the 3/16 ID x 1″ fender washers. This will allow the bevel headed screws to sit deep in the washer’s surface, minimizing the overall height.

Screw Fender Washers

This shows the bevel head screw sitting in the chamfer.

Bevel Head Screw

Bevel Screw

Rear Wheelwell Adjustments

For the rear tire fitment, the most critical adjustment is to the center the axle in the wheelwell.  This can be accomplished by replacing the springs with an engineered solution like Deaver, or use a 0.5″ lift block with repositioned pin location.
Lift Block

Impressions

These tires provide improved clearance and traction over a 33×12.5 or 285/75 R16, while allowing fitment with full suspension travel and minimal lift. The tire’s diameter requires an axle gearing change to maintain highway performance. I have used these tires successfully now for over 10 months and nearly 8,000 miles (all off-road or en route to trails).

Final Clearance Measurements at the rear axle (all tires near new, at 30psi):

Stock 265/70 R16 (baseline): 9 7/16″
285/75 R16 Geolander II’s: 10 1/2″
255/85 R16 BFG MT/KM: 10 3/4″

Final tests included a fitment verification on a 23 degree travel ramp. Only minor rubbing was still evident, with full suspension compression to the factory bumpstops. The score was 660.

Acceleration (0-60):
Stock- 10.6 seconds
After installing tires: 13.3 seconds
Note: Axle gearing not changed, speedometer adjusted to dia.

Interior Noise DB:
Stock: 65.4
After Installing Tires: 67

Lifted Tacoma

Vendor:
Manufacturer- BFGoodrich
Sponsor- Big O Tires, Arizona
Tires

Cost:
Retail- $1,290 for all 6 tires and wheels, mounted/balance
*Pricing subject to change, contact vendor

Weight:
27 lb. increase per tire and wheel over stock
Unsprung weight increased by 108 lbs.
Available payload decreased by 27 lbs.

Installation Difficulty:
Difficult

Installation Time:
Several hours

Specialty Tools Required:
None

Vehicle:
Expeditions West 2004 Tacoma Double Cab TRD

Expeditions West Product Rating

Quality
Rating 5/5

Durability
Rating 4/5

Reliability
N/A

Capability
Rating 4/5

Value
Rating 4/5

Expedition Rating
Rating 5/5

Overall Rating
Rating 4/5

Scott is the publisher and founder of Expedition Portal and Overland Journal. His travels by 4WD and adventure motorcycle span all seven continents and include three circumnavigations of the globe. He lives in Prescott, Arizona

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