The Donnelly EMP 700×45 tire is a high-volume, aggressive tread gravel tire designed for challenging terrain. Its tubeless-ready casing makes it ideal for riders seeking lower pressures, better traction, and reduced flats. This guide provides a technical walkthrough for setting up the Donnelly EMP 700×45 tubeless at home, with step-by-step advice on installation, troubleshooting, optimization, and compatibility.
Tools Required:
- Tubeless-ready rims (compatible with 700c tires)
- EMP 700×45 tubeless-ready tires
- Tubeless rim tape (width matched to internal rim width)
- Tubeless valve stems (Presta, 44–60mm recommended)
- Tire levers (plastic, non-metallic)
- Floor pump or tubeless-specific air compressor
- Sealant (2–4 oz. per tire)
- Valve core remover tool
- Soapy water or bead lubricant
- Clean cloth or shop towels
Understanding the EMP 700×45 Tubeless Construction
The Donnelly EMP 700×45 tire features a high-volume casing and tightly packed center knobs for speed, with aggressive side lugs for cornering grip. Its tubeless-ready construction incorporates a bead design optimized to seal securely against a compatible tubeless rim. The casing is supple but strong, balancing durability with compliance.
Rim and Tire Compatibility Check
Before installation, confirm that your wheels are tubeless-ready and have the correct internal width. For the 700×45 EMP, rims with an internal width of 19–25mm are optimal. Verify the rim bed is smooth, without spoke holes or debris, and that the tire bead aligns properly with the rim hook.
Tubeless rim tape must be installed without gaps or overlaps. Choose tape that is 2–3mm wider than the internal rim width for full coverage. Double-wrap if necessary for improved sealing.
Step-by-Step Tubeless Installation Process
1. Prep the Rims: Clean the rim bed with isopropyl alcohol to remove dirt or grease. Apply the tubeless rim tape smoothly, ensuring overlap at the valve hole.
2. Install the Valve Stem: Insert the tubeless valve through the valve hole, secure with a locking ring from the outside, and tighten it by hand.
3. Mount the EMP 700×45 Tire: Start by seating one bead of the tire onto the rim. Begin at the valve, then work around. Use tire levers only if necessary. Mount the second bead the same way, leaving a 4-inch section unseated.
4. Add Sealant: Shake the sealant bottle and pour 2–4 oz. directly into the tire through the unseated section. Rotate the tire to settle the sealant, then seat the final section.
5. Inflate: Using a compressor or a tubeless-specific floor pump, inflate the tire rapidly to seat the beads. Listen for audible pops indicating successful bead engagement. Do not exceed the maximum pressure listed on the tire sidewall.
6. Distribute Sealant: Shake the wheel laterally and bounce it lightly to spread sealant evenly. Rotate the tire several times to coat all internal surfaces.
7. Check for Leaks: Spray soapy water around the bead and valve area. Watch for bubbles, which indicate air leaks. Tighten or re-seat if necessary.
Initial Ride and Pressure Adjustment
After setup, allow the tire to sit for 12 hours to ensure bead retention. For the first ride, inflate to 40–45 psi to promote sealing under riding forces. Then adjust to your desired operating pressure based on terrain, rider weight, and comfort. Typical pressures for this tire range between 28–40 psi for gravel use.
Routine Maintenance and Sealant Refresher
Tubeless systems require periodic maintenance. Check pressure weekly, and top off sealant every 2–3 months or sooner in hot climates. Sealant can dry out and lose its sealing effectiveness over time. Unseat a portion of the tire to inspect for dried sealant and replenish as needed.
Inspect tire tread regularly for cuts, embedded debris, or casing damage. Although the EMP 700×45 features a reinforced casing, off-road terrain can still cause punctures. Sealant will manage minor intrusions, but deeper cuts may require a plug or patch.
Common Tubeless Setup Issues and Fixes
Beads Won’t Seat: If the tire beads don’t engage, check that both are properly inside the rim’s drop center. Apply soapy water around the bead and retry inflation. Sometimes removing the valve core for a higher airflow rate can help.
Persistent Air Leaks: Inspect rim tape for small wrinkles or gaps. Remove the tire and valve, then reinstall the tape with a double layer. Confirm that the valve stem is straight and tightly seated.
Sealant Leaking from Bead or Sidewall: This may occur if the casing is too porous during initial setup. Inflate to 50 psi and allow the sealant to fill gaps. Spin and shake the wheel vigorously. If leaks persist, add an extra ounce of sealant.
Customizing Setup for Performance
Lower Pressures for Grip: For loose gravel or mud, lowering tire pressure to the 28–32 psi range increases traction and comfort. The high-volume design of the EMP allows for lower pressures without risk of burping when properly installed.
Add Inserts: For extra rim protection or stability, consider using tubeless tire inserts. These fill the void between tire and rim, preventing bottom-outs and enhancing sidewall support.
Lightweight Sealant for Race Day: Some riders opt for a race-specific sealant formula that is thinner and quicker sealing, although it may require more frequent replenishment.
Comparison with Similar Tires
When compared to tires like the WTB Resolute 700×42 or the Maxxis Rambler 700×45, the EMP 700×45 stands out with its aggressive tread and larger volume. While the Resolute prioritizes all-weather versatility and the Rambler offers a balance of speed and grip, the EMP is optimized for traction and stability on demanding gravel and forest routes.
The EMP’s tighter center tread improves straight-line speed compared to chunkier tires, while the aggressive shoulders maintain grip during cornering. Riders seeking durability and reliable tubeless performance in rough terrain often favor the EMP for its balance of speed and control.
Compatibility with Drivetrain and Frames
The Donnelly EMP 700×45 is compatible with most gravel frames and forks that clear up to 45mm tires. Always measure frame clearance with inflated tire width, as actual casing dimensions may vary slightly from nominal values.
Tubeless compatibility is agnostic to drivetrain brand (Shimano, SRAM, or Campagnolo), but chainstay clearance and tire clearance near the front derailleur (if applicable) must be considered during setup.
Ensure the wheelset is designed for tubeless use. Older non-tubeless rims may not retain the bead safely under lower pressures and are not recommended for tubeless conversions without significant modification.
Conclusion
The Donnelly EMP 700×45 tire offers high-volume confidence and aggressive traction in a tubeless-ready package. Setting it up tubeless at home is entirely manageable with the right tools and attention to detail. Proper setup enhances performance, reduces flats, and delivers a smoother ride on variable terrain. With ongoing maintenance and optimization, the EMP 700×45 will remain a reliable partner on any gravel adventure.