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PRODUCT INFORMATION
Everything You Need to Know
Product details, specifications and fitment guidance.
PRODUCT OVERVIEW
Product Description
Transform your bike's rear suspension from a bouncy pogo-stick into a plush, track-ready setup with the authentic DNM MK-AR 290mm 1000LBS Adjustable Rear Shock, available at K. Mods Racing. A proven leader in off-road suspension, DNM is the go-to shock upgrade for custom-stretched Razor E-Moto swingarm builds (PremiumTorque, Midwest Mini Mods, Ride or Die R&D) and adult-ridden 70cc–190cc gas pit bikes.
Equipped with a heavy-duty 1000 lbs/in coil spring, nitrogen-charged oil damping, and dial-adjustable rebound, the MK-AR eliminates harsh bottoming out over jumps, whoops, and street drops while keeping your rear tire planted under hard electric or 4-stroke torque.
Key Features & Benefits
Functional Rebound & Preload Adjustability: Dial in how quickly your shock recovers after big hits using the external rebound clicker knob, and customize your exact ride height and rider sag with the threaded preload collar.
Heavy-Duty 1000LBS Spring Rate: Purpose-built for high-leverage cantilever/A-arm pit bike swingarms, extended Razor swingarms, and adult riders (140–240+ lbs) who blow through soft stock suspension.
Nitrogen-Charged Oil Damping: Pressurized monotube design prevents oil foaming (cavitation) for consistent, fade-free damping during hard track or street sessions.
Oversized 14mm Hard-Chromed Shaft: Constructed with a massive 14mm (0.55") hard-chromed damper shaft and a high-tensile 37mm steel body to resist bending on heavy landings.
Spherical Fish-Eye Bearings: High-strength 10mm ID × 20mm wide spherical eyelet bearings at both ends allow smooth suspension articulation without binding.
Optional Razor 10mm-to-8mm Hardware Kit: Building a stretched Razor MX500, MX650, or SX500? Select the "Shock + Razor 8mm Reducer Kit" option to include a precision 304 stainless steel 10mm-to-8mm eyelet reducer sleeve and alignment shims for a bolt-on fit into your factory 8mm Razor upper frame bracket—no drilling required.
TECHNICAL DETAILS
Specifications
Brand: DNM Suspension Technology (Distributed by K. Mods Racing)
Model: MK-AR
SKU: KMR-DNM-MKAR-290-1000
Eye-to-Eye Length: 290 mm (11.42 in)
Spring Rate: 1000 LBS/in
Total Stroke / Travel: ~60 mm (2.36 in)
Adjustments: External Rebound Damping Clicker + Threaded Spring Preload
Damper Shaft Diameter: 14 mm (0.55 in) Hard-Chromed Steel
Shock Body Outer Diameter: 37 mm (1.46 in) High-Tensile Steel
Outer Spring Diameter: ~68 mm (2.68 in)
Mounting Hole Inner Diameter (Eyelet): 10 mm (0.39 in) Top & Bottom Spherical Bearings (8mm with optional Razor Reducer Kit)
Mounting Width (Eyelet Thickness): 20 mm (0.79 in) Top & Bottom
Color: White Coil Spring / Black Body / Gold & Red Anodized Adjusters
Item Weight: ~3.8 lbs (1.72 kg)
FITMENT GUIDE
Compatibility
Designed for custom E-Moto swingarms and gas pit bikes requiring a 290mm (11.42") eye-to-eye rear shock with 10mm mounting bolts and 20mm bracket width:
PremiumTorque Billet Razor Swingarm: Direct fit for the recommended 290mm–310mm M10×20mm pit bike shock spec.
Midwest Mini Mods (MMM) Custom Razor Swingarm (V1 & V2): Direct upgrade for the standard 280mm–295mm 1000LB shock spec
Ride or Die R&D (RnD) Full Razor Swingarm: Fits MX500/MX650 setups (and lifted SX500 builds paired with extended front forks).
14"–17" Pit Bike A-Arm Swingarm Swaps: Fits any Razor frame converted to run an aluminum triangle/cantilever pit bike swingarm.
Razor Mounting Note: The Razor MX500/MX650 upper frame shock mount uses an 8mm (M8) bolt, while this DNM shock features 10mm (M10) eyelets. Either drill your upper Razor frame tabs to 10mm OR add our 10mm-to-8mm Stainless Steel Reducer Bushing & Shim Kit at checkout for a no-drill installation.
Stock Swingarm Warning:Will NOT fit stock Razor swingarms or bolt-on dropout extensions (like Electro & Co or EMF) that retain the factory 165mm–220mm shock mount.
Gas Pit Bikes & Dirt Bikes (70cc – 190cc Direct 10mm Bolt-On Fit)
Q: Will this shock fit my Razor MX650, MX500, or SX500?
A: Yes, if you are running an aftermarket full-replacement pit bike swingarm (such as PremiumTorque, Midwest Mini Mods, Ride or Die R&D, or an aluminum A-arm pit bike swingarm) that calls for a 280mm–310mm shock. It will not fit a stock Razor swingarm or bolt-on axle dropout extensions.
Q: Do I need the 10mm-to-8mm Reducer Kit for my Razor build?
A: Yes, unless you plan to drill out your upper Razor frame tabs to 10mm. The DNM MK-AR has 10mm mounting eyelets, while the Razor MX500/MX650 upper frame shock mount uses an 8mm bolt. Our 10mm-to-8mm Stainless Reducer Sleeve & Washer Kit slides inside the top shock eyelet and centers it inside the Razor frame bracket so you can use your factory 8mm bolt with zero play.
Q: How do I check if 290mm fits my gas pit bike?
A: With your bike on a stand and the rear wheel off the ground, measure your current shock from the center of the top bolt to the center of the bottom bolt. If it measures 285mm to 295mm (approx. 11.2" to 11.6") and uses 10mm bolts, this shock will bolt right in.
Q: Does the DNM MK-AR have real rebound adjustment?
A: Yes. Authentic DNM MK-AR shocks feature a working rebound damping clicker dial at the bottom eyelet that controls how fast or slow the shock extends after hitting a jump, plus a threaded spring collar to adjust preload and ride height.
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