The Panaracer GravelKing EXT 700×40 tire is built for riders tackling aggressive, loose, and off-camber gravel terrain. Known for its pronounced tread pattern and durable ZSG rubber compound, this tire combines grip and puncture resistance with comfort. Whether you’re setting up for a rugged race or remote bikepacking trip, this guide provides everything needed to install, optimize, and maintain your GravelKing EXT tires for peak performance.
Tools Required
- Tire levers (preferably plastic to avoid rim damage)
- Floor pump or tubeless-compatible air compressor
- Tubeless valve stems (if applicable)
- Tubeless rim tape
- Sealant (if setting up tubeless)
- Soapy water in a spray bottle
- Clean cloths or shop towels
- Torque wrench with hex bits (if wheels are removed)
- Digital pressure gauge
Tire Overview and Intended Use
The GravelKing EXT 700×40 is a high-volume gravel tire designed with a widely spaced, aggressive tread. It excels on muddy trails, rocky surfaces, and deep gravel paths. With a 40mm width, it offers better flotation and shock absorption, making it ideal for all-day rides on unpredictable terrain. This tire supports both tubeless and tubed setups and is compatible with most modern gravel rims.
Preparation Before Installation
Before installing the GravelKing EXT tires, inspect your rims for damage, old tape residue, or uneven surfaces. Clean the rim bed thoroughly using isopropyl alcohol to ensure proper adhesion of rim tape. If you’re running tubeless, make sure the rim tape width covers the spoke holes fully, and check that valve stems are seated securely and airtight.
Verify the tire’s directional arrow printed on the sidewall. The GravelKing EXT has a specific tread direction for optimal traction and braking control, especially in wet or loose conditions.
Installation Process
Start by mounting one side of the tire bead onto the rim. Work your way around, pushing the bead into the rim channel. For the second bead, begin at the valve and finish opposite it. This technique minimizes pressure at the valve and reduces the chance of tearing the bead.
If installing with an inner tube, partially inflate the tube before inserting it into the tire to avoid pinching. Seat the second bead carefully, using tire levers only if necessary.
For tubeless installation, add sealant after installing one bead, then rotate the tire to distribute it evenly after fully mounting both beads.
Once installed, use a floor pump or compressor to seat the tire. Spray soapy water around the bead to help it slide into place. Listen for distinct popping sounds as the tire seats. If the bead fails to seat fully, depressurize slightly, reposition the tire by hand, and inflate again.
Inflation and Pressure Guidelines
The optimal pressure range for the GravelKing EXT 700×40 depends on rider weight, terrain, and rim width. For riders between 65–85 kg, 28–35 PSI is a good starting point for tubeless setups. For inner tube installations, slightly higher pressures between 32–40 PSI are advisable to reduce the risk of pinch flats.
Always check tire pressure before each ride using a digital gauge. Avoid exceeding Panaracer’s maximum pressure ratings, especially on hookless rims.
Post-Installation Inspection
Spin the wheel to confirm even seating and check for sidewall wobble or deformation. Inspect for any visible gaps between the tire bead and rim hook, particularly around the valve stem.
For tubeless setups, shake and bounce the wheel to distribute sealant. Check for air leaks around the bead or valve using soapy water. If bubbles appear, re-seat the tire or add more sealant as needed.
Common Installation Issues and Fixes
Tight Bead Fit:
GravelKing EXT tires can fit tightly on some rims. If hand strength isn’t sufficient, place the tire in direct sunlight or a warm room for 10–15 minutes before installation to soften the rubber.
Bead Won’t Seat:
Ensure there’s enough airflow. Use a compressor or tubeless inflator for high-volume air delivery. Remove the valve core temporarily for better air rush during initial inflation.
Persistent Air Leaks:
Inspect for rim tape gaps or punctures in the sidewall. Reapply tape or add sealant if leaks persist. For older rims, consider upgrading to a wider tape for better coverage.
Maintenance and Longevity
Inspect your GravelKing EXT tires after each ride for cuts, embedded debris, or worn tread. Clean the tires with a damp cloth to remove dust and mud, especially after wet or muddy rides.
Replenish sealant every 2–3 months or sooner if riding in hot, dry conditions. Use a valve core remover to check the sealant level without unseating the tire.
Monitor tread wear indicators. When knobs become rounded or the center tread flattens, it’s time to consider replacement for optimal grip and safety.
Performance Optimization Tips
For enhanced rolling efficiency, rotate your tires regularly—front to rear and vice versa—to even out wear. This is especially effective for aggressive riders or those with unbalanced braking patterns.
Experiment with tire pressure based on terrain. Lower pressures improve grip and comfort on loose surfaces, while higher pressures reduce rolling resistance on hardpack trails.
Consider pairing the GravelKing EXT with a faster-rolling rear tire like the GravelKing SK 700×38 for mixed-terrain events that combine speed with grip.
Compatibility with Other Drivetrain Components
The GravelKing EXT 700×40 is compatible with most modern gravel bike frames supporting up to 42mm tire clearance. Double-check your fork and chainstay clearance before installation.
Ensure brake caliper spacing accommodates wider tires. Mechanical and hydraulic disc brakes generally allow ample room, but rim brake setups will not be compatible due to width limitations.
This tire works well with both 1x and 2x drivetrains. However, for steep climbing or technical descents, a 1x setup with a wide-range cassette pairs effectively with the GravelKing EXT’s high-traction profile.
Comparison with Similar Models
Compared to the GravelKing SK, the EXT version offers more aggressive tread suited for softer, looser terrain. While the SK rolls faster on pavement and hardpack, the EXT excels in mud, ruts, and rocky tracks.
The GravelKing EXT also provides more grip than the WTB Riddler and is more durable under heavy loads than the Teravail Rutland. Riders seeking a balance of grip and sidewall support may find the GravelKing EXT superior for adventure racing and rugged bikepacking.
FAQs
1. Can I use GravelKing EXT 700×40 tires with inner tubes?
Yes, the tires support both tubed and tubeless setups. Use a compatible 700×35–43c inner tube for the best fit.
2. Are these tires suitable for paved roads?
While they can be used on pavement, their tread is optimized for loose gravel and mud. Expect increased rolling resistance on smooth surfaces.
3. How much sealant should I use per tire?
For 700×40 tires, 60–90 ml (2–3 oz) of tubeless sealant is recommended for effective puncture protection.
4. What is the expected lifespan of the GravelKing EXT?
Depending on terrain and riding style, the tires typically last 2,000–3,000 miles before noticeable wear.
5. Can I use these tires in winter conditions?
Yes, they perform well in wet and cold weather. However, avoid icy roads as the tire is not studded.
6. Do I need a special rim for tubeless installation?
Your rim must be tubeless-compatible with a hooked or hookless bead design. Ensure the internal width supports a 40mm tire (ideally 19–25mm).
The GravelKing EXT 700×40 is a dependable, high-performance tire for riders tackling harsh gravel conditions. With correct installation, regular maintenance, and optimized pressure, it delivers outstanding traction, durability, and comfort on even the most demanding routes.