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Killer Junk 110mm – Firm • X-Firm • XX-Firm
Built for one mission: maximum free speed 🔥 The Killer Junk 110mm takes everything skaters love about the iconic Road Reaper and pushes it even further—stiffer hub, upgraded rebound, and a tuned inner-ring system that delivers insane roll with controlled edge grip.
Tested across thousands of laps, dozens of prototypes, and countless race-day battles, Killer Junk is engineered for skaters who want every watt of speed transferred straight to the ground. ⚡
🏆 Proven by the Fastest Skaters Alive
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Chevi Guzmán used Killer Junk technology to break the 100m & 200m World Records at the 2025 World Games, on his way to becoming the most decorated athlete in the event’s history.
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Francisco Ramirez, founder of Junk, completed a 380.8-mile 24-hour track performance — demonstrating the efficiency of Junk urethane + hub engineering over extreme ultra-distance skating.
- Loved by sprinters for explosive finish-line speed, and by marathon athletes for unmatched roll at high velocity. 🌪️
Killer Junk delivers the perfect balance of roll, control, and stability — gripping like a softer wheel but rolling like something harder. Ideal for high-speed racing where precision matters.
🎯 Why Skaters Love Killer Junk
- 💨 Elite roll for sprints, points races, and eliminations
- ⚡ Stiffer Natural Hub + 30% Fiberglass = more power transfer
- 🌀 Smoother cornering thanks to raw, pigment-free urethane
- 🎢 Stable under heavy load in 1000m and long-distance efforts
- 🌎 Perfect for: Track • Road • Marathon • Ultra-Marathon
🧪 Available Hardness Options
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💛 Firm (82–84A) — more grip and control for rougher surfaces or tactical racing
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💚 X-Firm (84–86A) — the balanced hardness: control + serious roll
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💙 XX-Firm (86–88A) — maximum roll and speed for smooth tracks & road
🎯 How to Order — Hardness & Quantity
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Step 1 — Choose Hardness: 💛 Firm • 💚 X-Firm • 💙 XX-Firm
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Step 2 — Choose Quantity: Per Wheel (1 Wheel) or Full Set (8 Wheels)
Please select the Hardness and “Per Wheel (1 Wheel)” or “Full Set (8 Wheels)” before adding to cart. 🛒
🎨 Natural Raw Urethane – Color Variation
Killer Junk uses raw, natural urethane with no pigments. Because of this, the appearance of the wheels can vary:
- Some wheels may look more milky or cloudy.
- Others may look more transparent, which can make the inner ring appear more visible or “redder.”
This is a natural feature of pigment-free race urethane — not a defect. Some of our set photos show this variation clearly and are a good example of how raw urethane can differ from wheel to wheel.
Killer Junk is a pure speed weapon — engineered for athletes who demand more roll, more stability, and more power out of every push. 🔥
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Killer Junk – Technology
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Natural Magic Urethane — raw, unpigmented, race-grade urethane for maximum rebound, speed, and consistency.
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MTech® Red Inner Ring (63A) — compresses on impact and releases explosive energy on push-off for unmatched snap & acceleration.
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Raw Natural Hub with 30% Fiberglass — stiffer than the Road Reaper hub for increased roll, sharper responsiveness, and improved power transfer at elite speeds.
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T70mm Profile — stability and support under heavy load at high speed.
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World-Record Engineering — uses the same performance architecture trusted by World Champions and World Record holders.
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Versatility by Design — powerful in sprints, efficient in marathons, and extremely stable in tactical pack racing.
🧠 How to Choose Wheel Hardness
Junk wheels use a dual-urethane system with a 63A inner ring (MTech®) and an outer hardness that controls grip, roll, and rebound. Choosing the right hardness depends on your weight, power, technique, and the surface you race on.
💛 FIRM (82–84A)
- Best for lighter skaters (under ~150 lbs / 68 kg).
- More grip and easier to “break into” the inner ring.
- Great for cooler, dusty, or slightly slick tracks.
- Ideal for technical and tactical racing where control matters.
💚 X-FIRM (84–86A)
- The most universal hardness — ideal for many skaters.
- Balanced roll + grip on prepared tracks and road circuits.
- Excellent for points, eliminations, marathons, and sprints.
- A common “daily race” hardness for many elite women.
💙 XX-FIRM (86–88A)
- Best for heavier or very powerful skaters.
- Maximum roll on smooth, hot, or very fast surfaces.
- Wears slower than softer wheels.
- Favored by many top-level sprinters and marathon skaters.
🔀 Mixing Hardnesses
- Mix hardnesses only one step apart:
- 💛 Firm + 💚 X-Firm ✔️
- 💚 X-Firm + 💙 XX-Firm ✔️
- 💛 Firm + 💙 XX-Firm ❌ Never
All Junk/MPC wheels share the same mold shape, so mixing hardnesses within the Junk family is safe and consistent. We do not recommend mixing with other brands, as different profiles can cause unpredictable handling.
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Shipping & Returns
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Fast Processing: Orders ship from our warehouse in Rhode Island within 3 days of being placed.
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Free USA Shipping: Domestic shipping is free on orders over $100 USD.
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Free International Shipping & Duties: On international orders over $500 USD, shipping and duties are free when you use the code shipyourjunk at checkout. The code must be used to receive free shipping and duties.
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Returns: Wheels must be new and unused to qualify for a return or exchange.
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Exchanges: If you selected the wrong hardness, we’ll help you exchange quickly and get you on the right setup.
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Support: Contact us anytime at support@junkwheels.com.