Bike rear shocks are critical components for enhancing ride comfort and control, absorbing impacts from rough terrain and improving traction. They are essential for a variety of bikes, from rugged mountain bikes and versatile e-bikes to compact folding bikes and even scooters. Products were evaluated based on adjustability, material durability, application versatility, and feature analysis.
Bike Rear Shock, Air Pressure Shock Absorbers, 125/150/165/190/210mm, 20/30/35/50/60mm Travel, Hydraulic Rear Suspension Shock for Mtb/e-bike/Folding (150 * 30mm)
$52.90
This air pressure shock absorber offers extensive versatility across multiple bike types and features fine-tuning capabilities with its adjustable air pressure system.
Search on AmazonCNCLOL Mountain Bike Rear Shock 120mm/125mm/150mm/165mm/185mm/190mm/200mm,Bicycle Shock Absorber- Hydraulic Rear Suspension Shock for Mtb/Mtn/ebike/Dmn.
$43.98
The CNCLOL hydraulic rear suspension provides broad compatibility and reliable performance through its oil pressure spring system, presenting a solid value option.
Search on AmazonDNM AO-39RC Mtb Rear Shock Bike Air Rear Shock Rebound/Lock Out- Adjustable Air Pressure 165/190/200mm bike rear shocks (165mm)
$122.00
The DNM AO-39RC stands out with advanced rebound and lockout adjustments, coupled with a durable AL-7075 shaft, indicating a higher-performance design.
Search on Amazon
- Application: MTB Rear Shock, suitable for mountain bike, electric bike,Mtn,ebike,Dmn,scooters and other bikes modification.
- Product Specifications: Eye to Eye/Shock distance:120x20mm/125x15mm/150x25mm/165x40mm/185x45mm/190x50mm/200x60mm ； Load:550lbs,750lbs,1000lbs,Bushing Size: 8mm x 24mm.
- Performance: Bicycle rear shock absorber, the shock absorption is controlled by the oil pressure spring system, the shock absorption is soft, more stable, and the service life is long; It has the same shock absorption effect as air pressure shock...
- How to choose right specification?：1.First, check the distance between the mounting holes,Whether it can be installed or not.2.Check your weight,Choose the shock absorption effect that suits you.3.Depending on the road you ride,Choose the best spec for...
- Note: The greater the weight (pounds) of the rear shock on the bike, the greater the pressure required. Please measure the size of the hydraulic shock absorber and your own riding comfort weight to match before purchasing.If you have any questions, please...
- PRODUCT SPECIFICATION: Adjustments Preload, Hard Chromed Shock Ø 10 Mm ( 0.39 Inch ) Shaft.Dark Hard-anodized Al-6061 “in One Piece” Shock Body, Riding style XC / Electric wheelchair.
- EXTRA BUSHINGS INCLUDED: Top busing size: 8mm x 24mm; bottom bushing size: 8mm x 24mm and extra bushing 8mm x 50mm length. We have included an additional set of bushings for easier installation, please see 2nd picture. (Please also watch the video in the...
- AVAILABLE SIZE: Available Size Eye to Eye x Travel 165 x 35 mm ( 6.5 x 1.38 inch).
- QUALITY: DNM produces high-quality shocks and forks in the cycling, motorcycle, and wheelchair industry. This is a great upgrade from the old shock. It is precisely machined to ensure great permanence.
- ORDER NOW, WORRY-FREE! We're so confident about the quality of our product that we can provide a 5-year warranty! Made in Taiwan.
- 2025 UPGRADE - AO-39RC is an upgrade to the AOY-36RC (DNM’s best-selling air shock, discontinued July 2025). It improves theTwo-Step Lock Out (Lock/Open)with a Three-Step system:Lock(paved roads),Middle (light off-road...
- Adjustments - Rebound / Three-Step Lock Out / Air Pressure Adjustable (Dual-Chamber)
- Available Size（Length x Stroke) - Eye to eye, 165 x 35mm (6.50 x 1.38inch), 190 x 50mm (7.48 x 1.97inch), 200 x 55mm (7.87 x 2.17inch)
- High-Strength - The damper shaft utilizes 10mm (0.39-inch) dark hard-anodized AL-7075 (58% harder than 6061), optimized for aggressive Trail/XC riding; the main body employs AL-6061 alloy
- Riding Type - TRAIL / XC / E-BIKE
- Application: MTB Rear Shock, suitable for mountain bike, electric bike,Mtn,ebike,Dmn,scooters and other bikes modification.
- Product Specifications: Eye to Eye/Shock distance:120x20mm/125x15mm/150x25mm/165x40mm/185x45mm/190x50mm/200x60mm ； Load:550lbs,750lbs,1000lbs,Bushing Size: 8mm x 24mm.
- Performance: Bicycle rear shock absorber, the shock absorption is controlled by the oil pressure spring system, the shock absorption is soft, more stable, and the service life is long; It has the same shock absorption effect as air pressure shock...
- How to choose right specification?：1.First, check the distance between the mounting holes,Whether it can be installed or not.2.Check your weight,Choose the shock absorption effect that suits you.3.Depending on the road you ride,Choose the best spec for...
- Note: The greater the weight (pounds) of the rear shock on the bike, the greater the pressure required. Please measure the size of the hydraulic shock absorber and your own riding comfort weight to match before purchasing.If you have any questions, please...
- Three Stage Locking: With its three-stage locking system, this shock absorber provides enhanced stability and control, ensuring maximum safety and comfort while riding.
- Length: 165mm/190mm/200mm/210mm Travel: 35mm/50mm/53mm/53mm
- Made of durable aluminum alloy material, the DNM Bicycle Air Shock Absorber is built to last, providing reliable and long-lasting performance.
- Damping Adjustment: The damping adjustment feature allows you to adjust the stiffness of the shock absorber, giving you total control over your ride.
- Pneumatic Structure: The pneumatic structure of this shock absorber provides a smooth and comfortable ride, making it ideal for both amateur and professional riders.
- Application: DNM AO-6 mountain bike rear shock absorber is made of high-quality aluminum alloy material, wear-resistant and corrosion-resistant. Small size and light weight, suitable for mountain bikes, MTB, folding bike, scooters, etc.
- High Air Pressure: Main air pressure adjustment, the highest air pressure can reach 250psi, it is recommended to use a pressure gauge to inflate.
- Product Specifications: MTB Shock, Eye to Eye 100x9mm/ 125x20mm/ 150 x 31mm/ 165x41mm/ 190x51mm; Sleeve Dimensions: 8mm x 24mm.
- Good shock absorption effect: Classic shock absorber, easy to relieve bumps, suitable for all kinds of roads, 2 different sizes for you to choose, to meet your different needs.
- Purchase Notes: Please confirm the size of the complimentary sleeve dimensions (8mm x 24mm) fits before purchasing.
- Fits: Replacement for 47cc 49cc 50cc 70cc 90cc 110cc 125cc Dirt ATV Bike ATV Go Kart, most of gas scooter electric bike minimoto dirt bike ATV quad mini pocket Bike.
- Material: The high-quality steel and aluminum alloy materials used in the construction of this shock absorber provide excellent resistance to corrosion, rust, and wear, ensuring a long service life even in harsh driving conditions.
- Specification: the length of the shock absorber is 125mm, the spring rate of the Bicycle rear shock absorber is 750lbs, accommodate different rider weights and preferences.
- Installation: Installation is simple, manipulated by hand. This can save time and effort for the user, as they can quickly swap out the old part for a new one without having to search for or purchase additional equipment.
- Package Includes: 1pc x rear shock damper+ 2pcs x screws.
- CAUTION: PLEASE DOUBLE CHECK YOUR SHOCK EYE TO EYE DISTANCE AND THE BUSHING SIZE BEFORE MAKE A PURCHASE. For older shocks, it is important to measure them while fully extended, preferably by removing them from the frame. The lengths provided in our...
- NOTICE: Spring Rate Consideration - The 190-240mm coil springs rate of this shock absorber is 550lbs, 265mm coil spring rate of this shock absorber is 450lbs. However, it is crucial to note that different frames, weights, preferences, and riding styles...
- Versatility: Designed to accommodate various demanding cycling styles and conquer complex road surfaces such as All-Mountain (AM), Freeride (FR), and Downhill (DH).
- Extensive Adjustment Capabilities: Customize your riding experience by adjusting the rebound speed, compression speed, and preload according to your personal preferences and specific road conditions.
- Bushing Size: The default configuration includes a 24mm*8mm bushing. If you need additional information, please don't hesitate to ask us a question, we typically respond within 24 hours.
- Features: DNM Pneumatic Shock Absorber, light weight, good quality, superior function, suitable for all kinds of bad road surface, AO-38RC can reach the highest air pressure up to 270psi!
- Product Specification: Adjustments Rebound / Lockout / Air Pressure Adjustable, Damper shaft Dark hard-anodized AL-7075 Ø 10 mm (0.39 inch) shaft. Dark hard-anodized AL-6061 shock body.Riding style XC /TRAIL, Available Size Eye to Eye x Travel 165 x...
- Improved: Air shock is much lighter than coil shock. This is a great upgrade from the old shock. It is precisely CNC machined to ensure no air or oil leaking. The negative air valve could possibly touch some frames, so DNM developed the new 38RC shock...
- Functional: Rebound Adjustment Knob +direction Rotation Increase Damper (Slow),- Direction Rotation, Decrease Damper (Fast). Compression Adjuster + Direction Rotation Lock-out,- Direction Rotation Open Up.main Air Chamber Supply Air Pressure According To...
- Barometric Recommendation: Weight 120 lbs - Main air chamber 90 Psi. Weight 140 lbs - Main air chamber 105 Psi. Weight 160 lbs - Main air chamber 120 Psi. Weight 180 lbs - Main air chamber 135 Psi. Weight 200 lbs - Main air chamber 150 Psi. Weight 220 lbs...
- Comfortable suspension Easily control the various sections, effective filtering cycling in the turbulence;
- Air pressure soft hard adjustment Through the air pressure to adjust the hard and soft shock, shock has injected 150 psi, the biggest air pressure limit within 250 psi
- Aluminum alloy materialAL - 6061 aluminium alloy, anti-corrosion wear-resistant, sealing capability;100/125/150/165/190mm
- Simple and safeBuilt-in DU bushing, good abrasion resistance, low friction coefficient, long service life;
- Ultra-light shock absorber: Air is used as the shock-absorbing spring medium, making it less than half the weight of ordinary coil spring shock.
This article is part of our complete guide Cycling — browse all our comparisons and buying guides.
Last update on 2026-07-14 / Affiliate links / Images from Amazon Product Advertising API
How to Choose the Best Bike Rear Shocks
Understanding Shock Type and Damping Systems
When selecting a bike rear shock, the primary distinction lies between air and hydraulic (or coil-over-oil) damping systems. Air shocks, such as the 'Bike Rear Shock, Air Pressure Shock Absorbers' (ASINs B0DJW2J7B7 and B0DJW3DJ11), offer significant tunability, allowing riders to adjust air pressure from 'soft to hard' to match their weight and preferred ride quality. This versatility is often preferred for varying terrains and rider preferences. In practice, air shocks tend to be lighter. Conversely, hydraulic rear suspension shocks, exemplified by the CNCLOL Mountain Bike Rear Shocks (ASINs B0F1FC2V9J and B0B8QT2K2W), typically rely on an oil pressure spring system. These are often known for their consistent damping characteristics and robustness, though they might lack the fine-tuned progressive feel of an air shock unless combined with additional features.
The Importance of Adjustability: Rebound and Lockout
Advanced adjustability significantly impacts a shock's performance. Features like rebound adjustment, as seen on the DNM AO-39RC, allow riders to control how quickly the shock extends after compression. A slower rebound (achieved by rotating the adjustment knob in the '+' direction) can prevent the bike from bucking over successive bumps, while a faster rebound can keep the wheel tracking better on technical climbs. Lockout functions, also present on the DNM AO-39RC, essentially stiffen the shock to near-rigid, making pedaling more efficient on smooth climbs or paved roads by minimizing power loss through suspension bob. Users report these features are invaluable for adapting to diverse riding conditions.
Compatibility: Eye-to-Eye Length and Travel
Correct sizing is paramount for proper function and bike geometry. The 'Eye to Eye/Shock distance' and 'Travel' specifications are critical. For instance, the 'Bike Rear Shock, Air Pressure Shock Absorbers' are available in various lengths like 125/150/165/190/210mm with corresponding travel options. Similarly, CNCLOL shocks offer a wide range from 120x15mm to 200x60mm. Mismatching these dimensions can lead to improper suspension articulation, affecting handling, frame clearance, and potentially damaging the frame or components. It's crucial to measure your existing shock or consult your bike's manufacturer specifications before purchasing. The application also dictates requirements; a longer travel shock like a 190x50mm might be suitable for a mountain bike, while a 125x20mm is often ideal for folding bikes or scooters.
Material and Durability Considerations
The construction material directly impacts a shock's strength, weight, and longevity. Aluminum alloy is a common choice, noted for its lightweight yet sturdy performance, as highlighted in the 'Bike Rear Shock, Air Pressure Shock Absorbers' descriptions. High-strength aluminum ensures stability and practical durability for various riding demands. Premium shocks, like the DNM AO-39RC, might feature specific alloys such as dark hard-anodized AL-7075 for components like the shaft, indicating enhanced wear resistance and precision engineering. While the Vkinman Universal Rear Shock Absorber and Suspension Spring (from other products) might highlight capacity (e.g., 1200LB), for performance shocks, the quality of the alloy and surface treatments are key indicators of long-term reliability.
Pros & Cons
Bike Rear Shock, Air Pressure Shock Absorbers, 125/150/165/190/210mm, 20/30/35/50/60mm Travel, Hydraulic Rear Suspension Shock for Mtb/e-bike/Folding (150 * 30mm)
Pros
- Highly versatile, accommodating MTB, e-bikes, folding bikes, and scooters with multiple size options.
- Air pressure adjustment allows fine-tuning from soft to hard, catering to rider preference and terrain.
- Constructed from lightweight yet sturdy aluminum alloy for durable performance.
Cons
- Lacks explicit mention of rebound or lockout adjustments, which advanced riders might seek.
- Requires a shock pump for air pressure adjustments, an additional tool not always included.
CNCLOL Mountain Bike Rear Shock 120mm/125mm/150mm/165mm/185mm/190mm/200mm,Bicycle Shock Absorber- Hydraulic Rear Suspension Shock for Mtb/Mtn/ebike/Dmn.
Pros
- Broad application suitability for a wide range of bikes including MTB, e-bikes, BMX, and scooters.
- Offers a comprehensive selection of eye-to-eye lengths and travel distances for various frame geometries.
- Utilizes a consistent oil pressure spring system for reliable shock absorption.
Cons
- Does not specify air pressure adjustment, limiting ride tunability compared to air shocks.
- Performance is controlled by a hydraulic spring, which may not offer the progressive feel of an air shock.
DNM AO-39RC Mtb Rear Shock Bike Air Rear Shock Rebound/Lock Out- Adjustable Air Pressure 165/190/200mm bike rear shocks (165mm)
Pros
- Features rebound adjustment, allowing control over shock extension speed for improved handling.
- Includes a lockout function for efficient pedaling on smooth terrain and climbs.
- Constructed with a dark hard-anodized AL-7075 shaft for enhanced durability and performance.
Cons
- Limited to specific eye-to-eye lengths (165/190/200mm), potentially less versatile for smaller bikes.
- While offering advanced features, the initial setup and tuning of rebound can be more complex for novice users.
Common Mistakes to Avoid
Overlooking Eye-to-Eye Length and Travel Compatibility
A common mistake is purchasing a rear shock without carefully matching its 'Eye to Eye/Shock distance' and 'Travel' to the bike's specifications. For example, installing a 150*30mm shock when your frame requires a 165*35mm, as offered by the 'Bike Rear Shock, Air Pressure Shock Absorbers' series, will fundamentally alter your bike's geometry, potentially leading to incorrect suspension action, reduced travel, or even frame damage. Always confirm these measurements.
Ignoring the Importance of Adjustability Features
Many riders overlook the value of features like rebound and lockout. A shock like the DNM AO-39RC, with its 'Rebound Adjustment Knob' and 'Lockout' function, provides crucial control over the ride. Failing to utilize or understand these adjustments means missing out on optimizing the bike's performance for varying terrains, leading to a less comfortable or less efficient ride than intended.
Misunderstanding Shock Type for Application
Selecting the wrong shock type for a specific application is another frequent error. While hydraulic rear suspension shocks, like the CNCLOL models, offer robust damping, an air pressure shock absorber (e.g., B0DJW2J7B7) might be more suitable if frequent fine-tuning for rider weight or terrain changes is desired. For instance, a folding bike might benefit more from a lighter, more compact air shock with precise adjustability for varied urban surfaces.
Disregarding Maximum Air Pressure Limits
For air shocks, ignoring the 'max 250 PSI' limit, as stated for the 'Bike Rear Shock, Air Pressure Shock Absorbers' and DNM AO-39RC, can lead to component failure or dangerous riding conditions. Over-inflating an air shock can damage seals and internal components, compromising its lifespan and performance. Always adhere to the manufacturer's recommended pressure range for safe and optimal operation.
