Carrying a full-size spare for your Jeep Wrangler means understanding the weight limits of your rear gate. Choosing the right spare tire for jeep wrangler is not just about looks—it affects safety, fuel economy, and how your tailgate holds up over time.
Most Wrangler owners upgrade to larger tires for off-road performance. But that bigger tire puts serious stress on the factory spare tire carrier. If you ignore the weight limits, you risk bending the rear gate or cracking the hinges.
This guide covers everything you need to know about selecting, mounting, and maintaining a spare tire for your Jeep Wrangler. We’ll talk about weight ratings, carrier upgrades, tire sizes, and common mistakes to avoid.
Why The Right Spare Tire For Jeep Wrangler Matters
Your Jeep Wrangler’s spare tire is more than a backup. It’s a critical part of your vehicle’s balance and off-road readiness. A mismatched or overweight spare can cause handling issues and even damage your Jeep’s body.
Factory spare tire carriers on JK and JL models are rated for around 85 to 100 pounds. That includes the weight of the tire plus the wheel. Many aftermarket tires and wheels easily exceed that limit.
When you install a heavier spare, the rear gate sags over time. The hinges wear out. The latch may not close properly. In extreme cases, the gate can crack or fail completely while driving.
Weight Limits You Need To Know
Here are the typical weight limits for different Wrangler models:
- JK (2007-2018): 85 pounds total for tire and wheel
- JL (2018-present): 100 pounds total for tire and wheel
- TJ (1997-2006): 75 pounds total for tire and wheel
- YJ (1987-1995): 70 pounds total for tire and wheel
These numbers are from Jeep’s official specs. Exceeding them by even 10-15 pounds can cause problems over time. If you run a 35-inch tire on a heavy steel wheel, you’re probably over the limit.
Spare Tire For Jeep Wrangler: Size And Fitment Guide
Matching the spare tire size to your other four tires is essential. If your spare is a different diameter, it can confuse the ABS and traction control systems. It also looks uneven and can cause driveline vibration on all-wheel drive models.
Here are the most common spare tire sizes for Wranglers:
- Stock sizes: 245/75R17, 255/70R18, 255/75R17
- Common upgrades: 33×12.50R17, 35×12.50R17, 37×12.50R17
- Extreme builds: 40×13.50R17 or larger
For every inch of tire diameter increase, you add roughly 10-15 pounds of weight. A 35-inch mud-terrain tire on a 17-inch alloy wheel can weigh 85-95 pounds. That’s right at the limit for a JL Wrangler.
Measuring Your Current Spare
To find the right spare tire for your Jeep Wrangler, measure the diameter and width of your existing tires. Use a tape measure across the tread from one side to the other. Then measure from the ground to the top of the tire (while inflated).
Write down these numbers. Compare them to the tire manufacturer’s specs. Most brands list exact dimensions on their website. Remember that actual sizes can vary by 0.5 to 1 inch depending on tread depth and air pressure.
Rear Gate Carrier Options
If your spare tire exceeds the factory weight limit, you need an upgraded carrier. There are three main types:
- Hinge-reinforced carriers – These bolt onto the existing tailgate hinges and add support. They work for tires up to 35 inches.
- Bumper-mounted carriers – These attach to the rear bumper and take the weight off the tailgate entirely. Good for 35-37 inch tires.
- Full replacement carriers – These replace the entire rear gate structure. They handle 37-inch and larger tires.
Each option has pros and cons. Hinge reinforcements are cheaper but still put some stress on the gate. Bumper-mounted carriers are more expensive but completely remove weight from the tailgate. Full replacements are the strongest but require more installation work.
Popular Carrier Brands
Some trusted brands for spare tire carriers include:
- Teraflex
- Smittybilt
- Rugged Ridge
- Body Armor 4×4
- Expedition One
These companies offer carriers that fit JK, JL, and TJ models. Always check the weight rating before buying. A carrier rated for 150 pounds can handle a 35-inch tire with a steel wheel.
How To Install A Spare Tire Carrier
Installing a new spare tire carrier is a weekend project for most DIYers. Here’s a step-by-step guide for a typical hinge-reinforced carrier:
- Remove the factory spare tire and wheel from the tailgate.
- Unbolt the factory hinges from the tailgate and body.
- Clean the mounting surfaces with degreaser.
- Apply thread locker to the new hinge bolts.
- Bolt the new carrier hinges to the body first.
- Attach the carrier arm to the hinges.
- Mount your spare tire onto the carrier using the provided studs.
- Tighten all bolts to the manufacturer’s torque specs.
- Check that the tailgate closes and latches properly.
For bumper-mounted carriers, you’ll need to remove the rear bumper first. Most kits include detailed instructions. Take your time and use a torque wrench for critical bolts.
Common Installation Mistakes
Here are mistakes people make when installing a spare tire carrier:
- Not using thread locker on bolts
- Over-tightening bolts and stripping threads
- Forgetting to check tailgate alignment
- Installing the carrier too low, causing the tire to hit the bumper
- Not greasing the hinge pins
Avoid these issues by reading the instructions fully before starting. If you’re unsure, ask a friend to help or take it to a shop.
Spare Tire For Jeep Wrangler: Maintenance Tips
Your spare tire needs care just like the other four. Here’s how to keep it in good shape:
- Check air pressure monthly – spares often lose pressure over time
- Rotate the spare into use every 5,000 miles to even out wear
- Inspect for dry rot if the tire is more than 5 years old
- Clean the wheel and tire to prevent corrosion
- Lubricate the carrier hinge pins every oil change
If you live in a snowy area, road salt can corrode the carrier hardware. Rinse it off regularly. Also check the spare tire cover if you use one – moisture can get trapped inside and cause rust.
When To Replace Your Spare
Tires age even if they don’t see much use. Replace your spare if:
- It’s more than 6 years old (check the DOT date code)
- There are visible cracks or bulges in the sidewall
- The tread depth is below 2/32 of an inch
- It’s been driven on while flat or damaged
A spare tire that looks fine can still fail if the rubber has degraded. Don’t risk a blowout on the highway. Replace it when needed.
Weight Distribution And Fuel Economy
A heavy spare tire affects your Jeep’s handling and fuel economy. The extra weight on the rear axle changes the balance. You may notice more sway in crosswinds or when cornering.
Fuel economy drops by about 1-2 MPG with a 35-inch spare compared to a stock tire. The added weight and aerodynamic drag are the main causes. If you drive mostly on pavement, consider a lighter alloy wheel for the spare.
Some owners remove the spare entirely for daily driving and only carry it on trails. That’s an option, but you lose the convenience of having a spare ready. If you do this, store the spare in your garage and use a tire plug kit for emergencies.
Balancing The Load
To offset the spare’s weight, distribute other cargo evenly. Keep heavy items like tools or recovery gear in the center of the vehicle. Avoid loading the rear cargo area too heavily on one side.
If you have a roof rack, put lighter items up top. Heavy items on the roof raise the center of gravity and increase rollover risk. The spare tire weight on the rear is already a factor, so be mindful of total load.
Spare Tire For Jeep Wrangler: Legal Considerations
In most states, your spare tire must not block your license plate or tail lights. If the spare sticks out past the bumper, you may need a license plate relocation kit. Some states also require a brake light on the spare if it blocks the factory one.
Check your local laws. Off-road parks and trails may have their own rules about tire protrusion. A spare that extends too far can also be a hazard in tight parking spaces or on narrow trails.
Insurance companies generally don’t require a spare tire. But having one can save you from being stranded. If you modify your spare carrier, inform your insurance provider to ensure coverage.
Liability For Falling Spares
A poorly mounted spare tire can fall off while driving. This is dangerous for you and other drivers. If your spare falls off and causes an accident, you could be liable for damages.
Always double-check that the spare is securely fastened. Use lock washers or thread locker on the mounting bolts. Inspect the carrier regularly for loose hardware or cracks.
Aftermarket Spare Tire Covers
Many Wrangler owners use spare tire covers for protection and style. Covers keep the tire clean and shield it from UV rays. They also prevent theft of the spare in some cases.
When choosing a cover, make sure it fits your tire size. A cover that’s too tight can trap moisture and cause rust. A loose cover can flap in the wind and damage the paint on your tailgate.
Popular cover materials include:
- Vinyl – affordable and easy to clean
- Canvas – durable and breathable
- Neoprene – good for wet climates
- Leather – premium look but high maintenance
Some covers have zippers for access to the spare without removing the whole cover. This is handy for checking air pressure. Others are one-piece and require removal to access the tire.
Custom Covers With Logos
You can get spare tire covers with custom logos, flags, or designs. Many off-road brands sell covers with their logos. Some owners use covers with humorous sayings or camouflage patterns.
Just make sure the cover doesn’t block your tail lights or license plate. If it does, you’ll need a relocation kit. Also consider that a bright cover can attract attention from thieves.
Spare Tire For Jeep Wrangler: Off-Road Considerations
Off-road, your spare tire is a lifeline. A flat tire in the backcountry can ruin a trip. Here’s what to think about for trail use:
- Carry a full-size spare, not a compact donut
- Make sure the spare matches the tread pattern of your other tires
- Bring a tire repair kit and air compressor as backup
- Consider a second spare if you run 37-inch or larger tires
On rocky trails, sidewall damage is common. A spare with the same tread depth gives you better traction if you need to use it. If your spare is a different brand or tread, it may not perform as well in mud or sand.
Mounting The Spare For Off-Road Clearance
If you have a rear bumper with a tire carrier, the spare sits lower than the factory mount. This can reduce your departure angle. On steep descents, the spare may hit rocks or dirt.
To improve clearance, some owners mount the spare higher using a raised carrier. Others move the spare to the roof rack or inside the cargo area. Roof mounting adds top weight, which affects handling. Inside mounting takes up cargo space.
Choose the mounting location based on your typical terrain. For rock crawling, a high-mounted spare on the rear is best. For overlanding, a roof mount might work if you don’t mind the height.
Cost Of Upgrading Your Spare Tire Setup
Upgrading your spare tire carrier and wheel can cost anywhere from $200 to over $1,000. Here’s a rough breakdown:
- Hinge reinforcement kit: $150-$400
- Bumper-mounted carrier: $400-$800
- Full replacement carrier: $600-$1,200
- New wheel for spare: $100-$400
- Spare tire cover: $30-$150
If you’re on a budget, start with a hinge reinforcement. It’s the cheapest way to safely carry a 33-inch or 35-inch spare. For larger tires, save up for a bumper-mounted carrier.
Don’t forget installation costs if you can’t DIY. A shop might charge $100-$300 to install a carrier. That’s worth it if you’re not comfortable with mechanical work.
Where To Buy
You can find spare tire carriers and wheels at:
- Quadratec
- ExtremeTerrain
- Amazon
- Local off-road shops
- Jeep dealerships (for OEM parts)
Compare prices and read reviews before buying. Some cheap carriers have poor welds or weak hinges. Stick with reputable brands for safety.
Frequently Asked Questions
Can I use a donut spare on my Jeep Wrangler?
No. Jeep Wranglers require a full-size spare for proper handling and clearance. A donut spare can damage the drivetrain if used for long distances.
How do I know if my spare tire is too heavy?
Weigh your tire and wheel on a bathroom scale. Compare it to your Jeep’s factory weight limit. If it’s over 100 pounds for a JL or 85 pounds for a JK, you need an upgraded carrier.
Does a spare tire cover affect fuel economy?
Yes, a cover can add a small amount of aerodynamic drag. But the effect is minimal compared to the tire itself. A tight-fitting cover may actually reduce drag slightly.
Can I mount a 37-inch spare on a stock tailgate?
No. A 37-inch tire typically weighs 100-130 pounds, far exceeding the factory limit. You must use a bumper-mounted or full replacement carrier.
How often should I rotate my spare tire?
Rotate the spare into use every 5,000 to 7,500 miles. This ensures even tread wear and extends the life of all five tires.
Final Thoughts On Your Spare Tire Setup
Choosing the right spare tire for your Jeep Wrangler comes down to weight, size, and mounting. Don’t skip the carrier upgrade if you run larger tires. A few hundred dollars now can save you from a broken tailgate later.
Check your spare’s pressure regularly. Inspect the carrier hardware for wear. And always carry a repair kit as backup. With the right setup, you’ll be ready for any trail or road emergency.
Your Jeep’s spare tire is a simple part, but it plays a big role in your safety and convienence. Take the time to set it up properly. Your tailgate—and your peace of mind—will thank you.