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Modern gravel racing is evolving and pushing standards aside at an extraordinary rate. By thinking about the wheel and tire as a complete system, new levels of performance are achieved.
The all-new Goodyear XPLR Slick and XPLR Inter tires are optimized around Zipp’s 303 XPLR wheelset.
What Is Goodyear Fitment Series
Inspired by OE tire equipment in the automotive world, Goodyear Fitment Series tires bring a new way of thinking to the cycling world, by viewing the wheel and tire as a system to unlock new levels of performance.
What are OE Tires in the Automotive world? OE stands for ‘Original Equipment’, OE tires are developed by tire manufacturers in conjunction with the vehicle manufacturer. Goodyear is one of the leading brands in OE with over 600 approvals from more than 30 vehicle manufacturers. The development of OE equipment takes place during the early stages of the vehicle design and development cycle. As part of this process, the tire manufacturer will focus on various performance aspects of the system as a whole, such as dry and wet handing, braking, and efficiency.
The Evolution Of Gravel Racing:
01
Average speed of the Unbound gravel race winner between 2006 to 2022
Average speed at modern gravel races is steadily increasing. From the low 20 kph 15 years ago, it’s common nowadays to see winning speeds in the mid-30 kph. Lachlan Morton won this year’s Unbound at an average of 35 kph, or 22 mph. Aerodynamics are playing an increasingly important role in gravel racing.
The Evolution Of Gravel Racing:
02
Vibration loss vs speed for various surface conditions
Another crucial element affecting speed in gravel is the amount of vibration coming from the road, and into your bike. On a perfectly smooth surface, the amount of power lost to vibration is zero. However, on light gravel, vibrations rob you of a significant amount of power: up to 10 watts at 20kph, and circa 20 watts at 32-35 kph. This undesirable effect further increases on rough gravel, where power loss grows exponentially with speed.
Why Fitment Series
Goodyear Bicycle Tires Fitment Series tires are the result of a collaborative approach to redefine performance and safety at the highest level. But why is Goodyear Fitment Series needed?
The problem with current gravel wheels and tires
Historically, bikes and their components follow a close, but not always synchronised line of evolution, with one part of the system often out of sync with the other along their evolutionary journey. For example, standard gravel rims are more often just modified road product, reinforced road rims lacking in modifications specific to gravel usage. Aerodynamics are optimized for road tires, not wider gravel tires. Narrow rim profiles suited to road use require air pressures above the recommended levels for gravel use, resulting in poor ride quality and low traction.
– Gravel rims are often reinforced road derived products.
– Aerodynamically optimized for road tires.
– Too narrow and shallow for gravel tires.
– Narrow width = higher air pressure required.
– Bouncy ride quality, low traction.
What makes XPLR different
Zipp’s 303 XPLR rim are developed specifically for gravel use, this means the rim is not simply a modified road rim, it has been developed from the ground up for gravel use. The 303 XPLR rim is significantly wider and deeper than a traditional gravel rim, both internally and externally. A wider rim profile means the rim and tire can be dimensionally proportional to one another when used with Goodyear XPLR tires, resulting in a harmonious complete system with benefits to aero properties, ride quality, and enhanced grip levels.
– XPLR rims are significantly wider and deeper than traditional gravel rims on the market.
– Designed from the ground up for gravel.
– Rim proportional to dimension of gravel tire.
– Wider internal and external dimensions.
– Deeper profile for enhanced aerodynamic properties.
Incomplete wheel / tire system
Progressing to a wider gravel specific rim yet remaining with a standard non-specific tire results in an incomplete wheel/tire system. Certain shortcomings still exist. Tire width will be incorrect resulting in wider than expected dimension. Tire shape will become distorted, the desired round profile will become more triangle in shape. Tire tread cap will not extent across the entire ground contact zone resulting in loss of grip, as well as exposing the tire sidewalls to the surface during cornering resulting in potential sidewall cuts and abrasions.
– Tire width incorrect.
– Tire shape not optimal.
– Tread cap flat across the top of the tire,resulting in loss of grip.
– Sidewalls exposed to surface duringcornering, resulting in potential cuts andabrasions.
The solution: Goodyear XPLR Fitment Series
Introducing the complete wheel/tire system for gravel racing, the Goodyear XPLR range combined with the Zipp 303 XPLR rim. The Zipp 303 rim and Goodyear XPLR tires have been developed in tandem to create a complete system for gravel racing. Rim dimensions and tire match proportionally for best possible aerodynamic properties. The 32mm internal width of the 303 XPLR rim perfectly supports the Goodyear XPLR tire at the lower pressures desired for gravel use. The complete system filters out vibration, enhancing grip levels and reducing body fatigue over time.
– Wheel is developed to fit gravel racing tires.
– Rim dimensions match tire for best aerodynamics.
– 32mm TSS internal profile supports tire atlow pressures.
– Vibration is filtered out, grip levels areenhanced.
– Less vibration reduces fatigue over time.
Benefits Of The XPLR Complete Wheel/Tire system:
01
Aerodynamic benefits of the XPLR system
At average race pace the aero benefit of the XPLR system is roughly 3 watts (measured in Zipp’s own lab). At higher speed (downhills), aero gain can exceed 10 watts.
Benefits Of The XPLR Complete Wheel/Tire system:
02
Tire pressure impact on power at 32 kph (20mph) on gravel road
The gains made due to lowering vibration levels are staggering. Depending on rider weight and air pressure, a saving of close to 10 watts is possible. Results are measured on Zipp’s Rolling Road, gains are an example of an 80kg rider, using 26-27 PSI on XPLR, vs. 33-35 PSI on traditional wheels and tires.
Benefits Of The XPLR Complete Wheel/Tire system:
03
Gravel Tire Rolling Resistance on 303 XPLR
Comparing similar section width in service, the complete XPLR wheel / tire system offers a significant improvement in rolling resistance.
Goodyear x ZIPP:
XPLR Slick - XPLR Inter
Optimized for use on Zipp’s new 303 XPLR, the Goodyear XPLR Fitment Series tires unlock new potentials in rolling resistance, grip, and aerodynamics, allowing riders to further push the limits of what’s possible.
SEMI-SLICK GRAVEL RACE TIRE, DESIGNED AROUND ZIPP’S UNIQUE NEW 303 XPLR WHEEL
TECHNOLOGY
- Fastest XPLR tire, designed for gravel racing on Zipp’s new 303 XPLR wheelset.
- For use on smooth surfaces when speed is high.
- Optimized construction, geometry, and volume maximize aerodynamics and vibration damping.
- Lowest rolling resistance and high-grip Dynamic:UHP compound.
- Sidewall protection for improved durability.
- Only approved tires can be used on Zipp XPLR wheels.
- Size and weight;
700x40: 440g
INTERMEDIATE GRAVEL TIRE, DESIGNED AROUND ZIPP’S UNIQUE NEW 303 XPLR WHEEL
TECHNOLOGY
- Versatile XPLR tire, designed for gravel racing on Zipp’s new 303 XPLR wheelset
- For use on intermediate gravel, where larger volume is desirable
- Optimized construction, geometry, and volume maximize aerodynamics and vibration damping
- Low rolling resistance and high-grip Dynamic:UHP compound
- Sidewall protection for improved durability
- Only approved tires can be used on Zipp XPLR wheels
- Sizes and weights;
700x45: 525g
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goodyear road range compared
The range of Goodyear road bicycle tires have been carfully designed to cover all conditions and situations. Choose a model from the range carefully considering your intended usage.
Eagle F1 SuperSport R
GRIP LEVEL 90%
PUNCTURE PROTECTION 40%
Rolling Speed 95%
WEIGHT 30%
Vector 4Seasons
GRIP LEVEL 90%
PUNCTURE PROTECTION 75%
Rolling Speed 80%
WEIGHT 45%
Vector Sport
GRIP LEVEL 85%
PUNCTURE PROTECTION 90%
Rolling Speed 75%
WEIGHT 55%
Eagle F1 R
GRIP LEVEL 90%
PUNCTURE PROTECTION 60%
Rolling Speed 85%
WEIGHT 35%
Eagle
GRIP LEVEL 85%
PUNCTURE PROTECTION 75%
Rolling Speed 75%
WEIGHT 40%
Eagle Sport
GRIP LEVEL 85%
PUNCTURE PROTECTION 75%
Rolling Speed 70%
WEIGHT 45%
