Why Your Spare Tire Sags and How to Fix It

By Body Armor 4x4 | Published: 2026-10-18

Category: Tips & Care

Learn why your Jeep JK spare tire sags or wobbles and how to fix it with a reinforced tire carrier. Step-by-step diagnosis and upgrade advice.

Quick Answer

A sagging spare tire on your Jeep JK is usually caused by a flexing carrier arm or worn pivot. Replacing it with a reinforced tire carrier eliminates the wobble and protects your tailgate.

Why the sag happens

The factory spare tire carrier on many JK models uses a single-action mechanism that relies on a pivot assembly. Over time, the pivot can wear or the carrier arm can flex under the weight of an oversized spare, especially when you mount a 37" or larger tire. This flex causes the tire to droop, creating an uneven gap between the tailgate and the carrier, and sometimes even pulling on the tailgate hinges.

When a simple fix isn't enough

If your carrier is structurally bent or the pivot has excessive play, tightening bolts or adding washers won't solve the root problem. At that point, upgrading to a carrier with a reinforced design and a heavy-duty dual bearing pivot assembly is the reliable long-term solution.

Diagnosis and Fix Steps

Symptom: The spare tire hangs lower on one side or wobbles when driving. The tailgate feels harder to close or doesn't align flush.
Likely Cause: A bent or flexed carrier arm, worn pivot bushing, or loose mounting bolts. On JK models, the single-action pivot assembly can develop play after repeated use with a heavy tire. If the arm is visibly bent or the pivot has more than 1/8" of play, a replacement is needed.
Corrective Action: Inspect bolts and tighten to spec. If sag persists, replace the carrier with a reinforced design like the RTC Reinforced Tire Carrier (product_id: 1926387) or the Single Action Carrier (product_id: 1926393), depending on your tire size and bumper compatibility. Choose the RTC Reinforced if you run a 37" tire and want body protection. Choose the Single Action if you need 40" capacity and have a compatible JK-2965/JK-2966 bumper.
When to stop or choose another option: If your carrier is not bent and the pivot feels tight, simply tightening bolts and lubricating the pivot may solve the sag. If the carrier is bent or the pivot is sloppy, stop using it and upgrade. Don't try to shim a bent carrier—it will only mask the problem and risk tailgate damage.

Products that help

2007-2018 JEEP WRANGLER JK RTC REINFORCED TIRE CARRIER: The 2007-2018 Jeep Wrangler JK RTC Reinforced Tire Carrier mounts up to a 37" tire, includes protective gaskets, and has a reinforced design that prevents potential damage to the body. If you run a 37" spare, this carrier's added reinforcement stops the sag before it starts and keeps your tailgate aligned.
2007-2018 JEEP WRANGLER JK RTC REINFORCED TIRE CARRIER
2007-2018 JEEP WRANGLER JK TIRE CARRIER SINGLE ACTION (FITS JK-2965/JK-2966 BUMPER): The 2007-2018 Jeep Wrangler JK Tire Carrier Single Action uses a steel tube construction with an HD dual bearing pivot assembly and carries up to a 40" tire. For those needing a 40" spare capacity, this carrier's heavy-duty pivot eliminates the wobble that causes sag on lesser carriers.
2007-2018 JEEP WRANGLER JK TIRE CARRIER SINGLE ACTION (FITS JK-2965/JK-2966 BUMPER)