Tire Rubbing the Upper Control Arm: Check Backspacing First

The short answer: if your tire hits the upper control arm, the wheel is usually the problem, not the arm. JBA, which makes upper arms, says on its own support page that tire-to-arm rub is “usually a wheel and tire fitment issue, not an arm defect”, and that changing the arm will not always fix it. Check your wheel’s backspacing against the arm maker’s maximum. Dirt King lists 4.75″ for its arms on the 2005–2023 Tacoma and 2003–2024 4Runner, but 5.75″ on the 2024+ Tacoma and 2025+ 4Runner. A wheel that fits the new truck can be an inch too deep for the old one.

First, find what touches what

JBA’s troubleshooting guide says to work out what is contacting what, and when, before changing parts. Its guide asks for photos with:

• The truck at ride height
• The steering straight
• The steering at full lock (we’d shoot both directions)
• The suspension hanging at droop, only if the truck is safely lifted

Those photos tell apart the tire hitting the arm, the ball joint hitting the coil spring, an ABS line bracket problem, and another part contacting the arm under travel. Only the first is a wheel and tire question. Shiny or scraped spots on the arm are where to look. JBA also asks whether the rub happens only at full lock or all the time, because that changes the answer.

Check the wheel against the arm’s maximum

Backspacing is the distance from the wheel’s mounting face to its inner edge. More of it tucks the tire in toward the upper arm and coilover. Dirt King prints a maximum on its upper control arm pages. These are stock-track arms for lifts of roughly 0–3″:

Dirt King published specifications, as listed October 2026. Prices run from $749 (2005–2023 Tacoma ball-joint arms) to $1,449 (billet arms). Total Chaos lists the wheel it runs rather than a maximum. On its uniball arms for pre-2024 Toyotas ($967.27, October 2026), that’s 16×8 at 4.5″ or 17×8.5 at 4.75″. For any other brand, get the number from the spec sheet or install instructions.

If your wheel’s backspacing is over the arm’s maximum, you’ve probably found the rub. Wheels are sold by offset, not backspacing. To convert, use width ÷ 2 + offset (mm) ÷ 25.4 + 0.5″. A 17×8.5 at 0 mm works out to about 4.75″. A 17×8.5 at +25 mm works out to 5.7–5.8″, which fits a 2024+ Tacoma but is an inch over the limit on a 2005–2023. The wheel backspacing guide covers the conversion and the long-travel kit limits.

Fixes, least invasive first

1. Confirm it’s the tire. If the photos show the ball joint or arm touching the spring, skip to the next section.
2. Check tire size, wheel width and tread. JBA lists tire width, tire diameter, wheel width, backspacing, offset and tread design as the variables, and asks specifically whether the tire is an aggressive mud or hybrid tread.
3. Get the backspacing under the maximum. The clean fix is a wheel with less backspacing. A wheel spacer reduces effective backspacing by its own thickness, so a 1″ spacer on a 5.75″ wheel gives about 4.75″. It also pushes the tire out toward the fender, just as a lower-offset wheel would.
4. Get an alignment after any arm install. JBA lists a professional alignment as a basic check after installation, and warns that a shop aligning a lifted truck to generic stock targets is a cause of handling problems. Recheck clearance at full lock afterwards.
5. Check the arm is right for the lift. Dirt King rates its arms for about 0–3″ of lift and warns against installing them with coil spacers combined with extended-length shocks. JBA lists “using the wrong arm for the vehicle or lift type” among the common causes of problems after an install.

If the tire rubs the inside of the wheel well or the cab mount instead of the arm, that’s the opposite problem: too little backspacing or too much tire. See cab mount chop. Dirt King’s 2015–2022 Colorado arm page says the arms allow 33″ tires, but the wheel well and bumper may need modifying for proper clearance.

When it isn’t the tire: stop driving

JBA treats an upper arm or ball joint touching the coil spring differently: “This is a geometry problem and needs immediate attention.” Its listed causes include more lift than intended, the wrong arm for the lift type, and the suspension running at a steeper angle than designed. JBA’s guide says not to keep driving with loud metal-on-metal contact, visible contact between the arm and another suspension part, looseness at the arm mounts, or a clunk that is getting worse. Inspect it before the next drive. JBA’s listed causes point at lift height and parts choice, not the wheel. Bump stops and limit straps covers controlling travel at both ends.

Tire rubbing upper control arm FAQ

Will new upper control arms stop my tire rubbing?

Not necessarily. JBA, which sells upper arms, says changing the arm will not always fix tire-to-arm rub, because the cause is usually wheel and tire fitment. Aftermarket arms also have their own backspacing limit, so check yours against the maker’s maximum before buying.

What backspacing do I need for aftermarket upper control arms on a Tacoma?

Dirt King lists a 4.75″ maximum on its 2005–2023 Tacoma arms and 5.75″ on its 2024+ Tacoma arms. Total Chaos runs a 16×8 at 4.5″ or 17×8.5 at 4.75″ on its pre-2024 Tacoma arms.

Why does my tire only rub at full lock?

Turning the wheel swings the tire’s shoulder through the space next to the arm. JBA singles out full steering lock as where a larger or wider tire on the wrong wheel contacts the arm. Photograph the wheel at full lock in both directions to see exactly where it touches.

Can I grind the arm for clearance?

We wouldn’t. None of the three makers we checked (JBA, Dirt King and Total Chaos) suggests it, and the published backspacing limits are for the arm as built. Fix the wheel or tire instead.

More suspension and wheel guides

• Wheel backspacing for long travel
• Prerunner wheels and tires
• Dirt King prerunner suspension
• Total Chaos for prerunners
• Bump stops and limit straps
• Toyota Tacoma prerunner build
• Toyota 4Runner prerunner build