Wheel durometer measures the hardness of a wheel’s urethane, directly affecting grip, speed, and ride comfort. It is the single most important factor for choosing the right wheels for skateboards, inline skates, or longboards.
In this complete guide, you will learn how durometer scales work, how to match hardness to your terrain, and expert tips for selecting the perfect wheel. Keep reading to master this essential skate component.
Best Skateboard Wheels for Every Riding Style
Bones STF V5 Sidecut – Best for Street Skating
The Bones STF V5 Sidecut features a 99A durometer, offering the perfect balance of grip and slide. Its patented Stone Ground formula reduces flat spots while providing a smooth, controlled breakaway. Ideal for technical street tricks and ledges.
OJ Super Juice 60mm 78A – Best for Cruising
With a soft 78A durometer, the OJ Super Juice absorbs cracks and rough pavement effortlessly. The 60mm diameter offers a low profile for stable pushes. This is the best option for long-distance cruising and commuting on city streets.
Spitfire Formula Four 99D – Best for Park & Bowl
The Spitfire Formula Four uses a 99D durometer, providing unmatched durability and rebound. Its radial cut shape delivers consistent slide control on concrete transitions. Recommended for vert ramps and skatepark bowls where speed is critical.
Understanding the Durometer Scale for Skateboard Wheels
The durometer scale measures a wheel’s resistance to indentation. Most skate wheels use the Shore A or Shore D scale, where higher numbers mean harder urethane.
Shore A vs. Shore D: What Is the Difference?
Shore A measures softer wheels from 75A to 100A. Shore D takes over above 100A, with wheels like the 99D being significantly harder. A 78A wheel feels squishy, while a 101A wheel feels like plastic.
- 75A to 87A (Soft): Maximum grip, smooth ride on rough pavement. Ideal for cruising and longboards.
- 88A to 95A (Medium): Good balance of slide and grip. Suitable for park skating and ramps.
- 96A to 101A (Hard): Fast, slick, and perfect for technical street tricks and smooth skateparks.
How Durometer Affects Speed and Grip
Harder wheels roll faster on smooth surfaces because they create less friction. However, they vibrate more on rough ground, reducing comfort. Softer wheels deform over cracks, providing grip and shock absorption at the cost of top speed.
Choose your durometer based on your primary surface. Street skaters prefer 99A-101A for slides, while cruisers need 78A-87A for comfort.
How to Choose the Right Wheel Durometer for Your Setup
Selecting the correct wheel durometer depends on your skating style, weight, and local terrain. A beginner often benefits from a medium durometer around 90A for versatility.
Matching Durometer to Skating Discipline
Each discipline demands a specific hardness range for optimal performance. Using the wrong durometer can hinder your progression and reduce enjoyment.
- Street Skateboarding: 99A-101A for slides, pop, and board feel on smooth asphalt or skateparks.
- Vert & Bowl: 97A-99D for stability, speed, and grip on steep concrete transitions.
- Cruising & Longboarding: 75A-87A for shock absorption and grip on rough city streets.
- Park & Mini Ramp: 92A-97A for a balanced mix of slide control and roll speed.
How Rider Weight Affects Durometer Choice
Heavier riders compress softer wheels more, making them feel slower and sluggish. A 180-pound skater should choose a durometer 2-4 points harder than a 130-pound skater on the same terrain.
Lighter skaters often prefer softer wheels to gain grip without sacrificing speed. This adjustment ensures the wheel performs as the manufacturer intended.
Terrain Considerations for Wheel Hardness
Your local surface quality should dictate your final choice. Smooth concrete parks reward hard wheels, while rough asphalt demands soft urethane for comfort.
If you skate multiple surfaces, consider a 97A medium-hard wheel as a compromise. It handles slides well while absorbing moderate vibrations.
Common Wheel Durometer Myths and Misconceptions
Many skaters believe harder wheels are always faster, but this is not entirely true. Surface texture and wheel size also play major roles in overall speed.
Myth: Harder Wheels Are Always Faster
Hard wheels only roll faster on perfectly smooth surfaces like polished concrete. On rough asphalt, a soft 78A wheel actually maintains speed better because it absorbs vibrations instead of bouncing.
Bouncing creates micro-losses in momentum. Softer urethane conforms to the ground, keeping the wheel in constant contact for efficient rolling.
Myth: Softer Wheels Wear Out Faster
Soft wheels do wear down quicker on smooth surfaces due to higher friction. However, on rough terrain, hard wheels chip and flat-spot more easily, leading to premature replacement.
- Soft wheels: Wear evenly but faster on smooth ground.
- Hard wheels: Chip, crack, or flat-spot on rough surfaces.
- Best practice: Match durometer to your primary surface for maximum lifespan.
Myth: You Should Only Skate One Durometer
Many skaters own multiple sets of wheels for different spots and conditions. Switching between a 99A set for the park and a 78A set for cruising is common practice.
Having options allows you to adapt to weather, surface changes, and trick requirements. It also extends the life of each set by reducing wear.
How to Test and Compare Wheel Durometer at Home
You can measure wheel hardness without expensive equipment using simple techniques. These methods help you verify if your wheels match their labeled durometer.
The Fingernail Test for Quick Assessment
Press your fingernail firmly into the wheel’s urethane surface. A soft wheel (78A-87A) will leave a visible dent, while a hard wheel (99A+) will resist indentation completely.
This test gives a rough estimate but is not precise. It works best for comparing two wheels side by side to feel the relative difference.
The Drop Test for Rebound Comparison
Drop each wheel from shoulder height onto a hard concrete floor. A higher bounce indicates a harder durometer with more rebound, while a low bounce suggests a softer, grippier compound.
- High bounce (tall): 99A-101A hardness, ideal for slides and speed.
- Medium bounce (mid): 92A-97A, good all-around performance.
- Low bounce (short): 78A-87A, best for cruising and grip.
Using a Durometer Gauge for Accuracy
For precise measurement, purchase a Shore A durometer gauge available online for around $30. Place the wheel on a flat surface and press the gauge needle into the urethane.
Read the measurement immediately for the most accurate result. This method removes guesswork and helps you identify mislabeled wheels.
| Test Method | Accuracy | Tools Needed |
|---|---|---|
| Fingernail Test | Low | None |
| Drop Test | Medium | Hard floor |
| Durometer Gauge | High | $30 tool |
Wheel Durometer and Its Effect on Bearing Performance
Your wheel hardness directly impacts how your bearings perform and how long they last. Hard wheels transfer more vibration to bearings, while soft wheels dampen shock.
Why Harder Wheels Wear Bearings Faster
Hard wheels like 101A urethane transmit every crack and pebble impact directly into the bearing shields. This constant vibration loosens internal ball bearings and degrades lubricant over time.
Skatepark skaters using hard wheels should clean and lubricate bearings every two weeks. This maintenance prevents premature failure from accumulated shock damage.
How Soft Wheels Protect Your Bearings
Soft 78A wheels absorb road imperfections before they reach the bearing. The urethane acts as a natural suspension system, reducing stress on bearing races and cages.
- Soft wheels: Bearings last 2-3 times longer on rough terrain.
- Hard wheels: Bearings require more frequent cleaning and replacement.
- Best practice: Use shielded bearings with hard wheels for extra protection.
Optimal Bearing Choices for Different Durometers
Match your bearing quality to your wheel hardness for balanced performance. Budget bearings work fine with soft cruiser wheels, while precision bearings handle hard wheel vibrations better.
| Wheel Durometer | Recommended Bearing | Maintenance Frequency |
|---|---|---|
| 78A-87A (Soft) | Standard ABEC-3 | Every 2 months |
| 92A-97A (Medium) | ABEC-5 or 7 | Every 4 weeks |
| 99A-101A (Hard) | ABEC-9 or Swiss | Every 2 weeks |
Wheel Durometer for Electric Skateboards and Longboards
Electric skateboards and longboards have unique durometer requirements due to higher speeds and motor torque. Choosing the wrong hardness can cause wheel slip or speed wobbles.
Best Durometer for Electric Skateboard Wheels
Most electric skateboard wheels use a 78A to 80A durometer for maximum grip during acceleration and braking. Soft urethane prevents wheel spin on starts and slides during sudden stops.
Harder wheels above 90A cause dangerous loss of traction on electric boards. The motor torque overpowers the grip, leading to unpredictable slides at high speed.
Longboard Wheels for Downhill and Freeride
Downhill longboarders need 78A to 82A wheels for gripping pavement at 40+ mph speeds. Freeride skaters prefer 80A to 84A for controlled slides without flat spotting.
- Downhill: Soft wheels for maximum grip and stability.
- Freeride: Medium-soft wheels for predictable slide initiation.
- Cruising: 75A-78A for comfort on long distance rides.
Why Electric Boards Need Larger Diameter Wheels
Electric skateboards typically use 90mm to 107mm wheels to clear debris and absorb bumps. Larger diameter combined with soft durometer creates a smooth ride at high speeds.
| Board Type | Optimal Durometer | Wheel Size |
|---|---|---|
| Electric Skateboard | 78A-80A | 90mm-107mm |
| Downhill Longboard | 78A-82A | 70mm-75mm |
| Freeride Longboard | 80A-84A | 65mm-70mm |
How Temperature and Weather Affect Wheel Durometer
Urethane hardness changes with temperature, affecting grip and slide performance. A wheel that feels perfect in summer can feel like ice in winter conditions.
Hot Weather: Softer Feel and More Grip
High temperatures soften urethane, making a 99A wheel feel closer to 95A. This increased grip is great for park skating but can make slides harder to initiate.
Skateboarders in hot climates should choose wheels one to two durometer points harder than normal. This compensates for the thermal softening and maintains predictable slide behavior.
Cold Weather: Harder Feel and Less Traction
Cold temperatures stiffen urethane, turning a 78A wheel into a rock-hard 85A feel. This reduces grip significantly and increases the risk of sliding out during turns.
- Below 50°F (10°C): Wheels feel 4-6 points harder than labeled.
- 50°F-70°F (10°C-21°C): Normal performance as expected.
- Above 80°F (27°C): Wheels feel 2-4 points softer than labeled.
Wet Conditions and Durometer Safety
All wheels lose grip in wet conditions regardless of durometer. However, softer wheels (78A-85A) maintain more traction on damp surfaces than hard wheels.
Hard wheels above 95A become dangerously slippery on wet pavement. Avoid skating in rain entirely, but if necessary, use the softest wheels available.
| Temperature Range | Effective Durometer Change | Recommended Adjustment |
|---|---|---|
| Below 50°F | +4 to +6 points harder | Use softer wheels |
| 50°F-70°F | No change | Normal setup |
| Above 80°F | -2 to -4 points softer | Use harder wheels |
Conclusion: Master Wheel Durometer for the Perfect Ride
Understanding wheel durometer transforms your skating experience by matching hardness to your terrain, weight, and style. Soft wheels grip rough streets, while hard wheels slide fast at the park.
The key takeaway is simple: test different durometers and adjust for temperature and riding conditions. Start with a medium 92A-97A wheel if you are unsure.
Now that you know how durometer works, choose your next set with confidence. Your perfect ride is just one wheel swap away.
Frequently Asked Questions about Wheel Durometer
What does wheel durometer actually mean for skateboarding?
Wheel durometer measures the hardness of urethane using the Shore A or Shore D scale. A lower number means a softer wheel that grips more, while a higher number means a harder wheel that slides easier.
This measurement directly affects how your board feels on different surfaces. Choosing the right durometer is essential for comfort, speed, and control during your ride.
What durometer is best for beginner skateboarders?
Beginners should start with a medium durometer around 92A to 97A. This range offers a forgiving balance of grip and slide while learning basic tricks and turning.
Softer wheels are too grippy for learning slides, while harder wheels feel too slippery. Medium durometer helps build confidence across multiple surfaces.
How do I know what durometer my skateboard wheels are?
Check the sidewall of your wheel for printed numbers like 78A, 99A, or 99D. Most manufacturers clearly label the durometer rating on the urethane surface.
If the label is worn off, use the drop test or fingernail test to estimate hardness. For precise measurement, purchase a Shore A durometer gauge online.
What is the difference between 78A and 99A skateboard wheels?
A 78A wheel is very soft, providing maximum grip and shock absorption for rough roads. It is ideal for cruising, longboarding, and electric skateboards.
A 99A wheel is much harder, offering less grip but faster roll speed on smooth surfaces. Street skaters and park riders prefer 99A for slides and technical tricks.
Can I use soft wheels at the skatepark?
You can use soft wheels at the skatepark, but they are not ideal. Soft wheels grip too much on concrete, making slides difficult and slowing you down on transitions.
They also wear out faster on smooth park surfaces. For best results, use 97A to 101A wheels at the skatepark for speed and control.
How does rider weight affect wheel durometer choice?
Heavier riders compress softer wheels more, making them feel sluggish and slow. A 180-pound skater should choose a durometer 2-4 points harder than a 130-pound skater.
Lighter riders can use softer wheels to gain grip without sacrificing speed. Always adjust durometer based on your weight for optimal performance.
What durometer should I choose for electric skateboards?
Electric skateboards need soft wheels between 78A and 80A for maximum traction. Motor torque can overpower harder wheels, causing dangerous slides during acceleration or braking.
Larger diameters like 90mm to 107mm combined with soft urethane create a smooth ride. Avoid wheels above 85A for electric boards to maintain control.
Do wheel durometer ratings change with temperature?
Yes, temperature significantly affects urethane hardness. Hot weather softens wheels by 2-4 points, while cold weather hardens them by 4-6 points.
Adjust your wheel choice seasonally for consistent performance. Use harder wheels in summer and softer wheels in winter to compensate for temperature changes.
What is the hardest skateboard wheel durometer available?
The hardest common skateboard wheels are 101A on the Shore A scale or 99D on the Shore D scale. These wheels are extremely hard and offer minimal grip.
They are designed for smooth concrete skateparks and technical street skating. Hard wheels above 99A require precise technique and smooth surfaces to perform well.
How often should I replace my skateboard wheels?
Replace wheels when they show visible flat spots, uneven wear, or significant diameter reduction. Hard wheels may last 3-6 months, while soft wheels wear faster.
Inspect your wheels monthly for cracks, chips, or flat spots. Rotating wheels front to back can extend their lifespan by distributing wear evenly.