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.
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- 5 Sizes for Precise Fit: Available in 100/125/150/165/190mm eye-to-eye lengths with 8mm×24mm DU bushings. Compatible with MTB, folding bikes, e-bikes, and scooters. Please measure your current bike shock's eye-to-eye length and stroke before ordering to...
- Lightweight Air Shock: Weighs less than half of traditional coil spring shocks, making every climb feel noticeably easier. Pre-charged at 150 PSI from factory. Adjustable up to 250 PSI via standard Schrader valve — inflate with any regular bike pump
- Premium Contruction: Made from aluminum alloy, CNC-machined shock body with hard-anodized finish delivers exceptional strength-to-weight ratio and corrosion resistance
- Adjustable Air Pressure: Adjust in perfect pressure for your weight and terrain. Higher PSI for heavier riders, lower for plush feel. Comes with 8mm×24mm DU bushings featuring low friction coefficient and long service life for direct, hassle-free...
- 5 Sizes for Precise Fit: Available in 100/125/150/165/190mm eye-to-eye lengths with 8mm×24mm DU bushings. Compatible with MTB, folding bikes, e-bikes, and scooters. Please measure your current bike shock's eye-to-eye length and stroke before ordering to...
- Lightweight Air Shock: Weighs less than half of traditional coil spring shocks, making every climb feel noticeably easier. Pre-charged at 150 PSI from factory. Adjustable up to 250 PSI via standard Schrader valve — inflate with any regular bike pump
- Premium Contruction: Made from aluminum alloy, CNC-machined shock body with hard-anodized finish delivers exceptional strength-to-weight ratio and corrosion resistance
- Adjustable Air Pressure: Adjust in perfect pressure for your weight and terrain. Higher PSI for heavier riders, lower for plush feel. Comes with 8mm×24mm DU bushings featuring low friction coefficient and long service life for direct, hassle-free...
- 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
- 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...
- Size:165×35mm (6.50×1.38inch) about 293g; 190×50mm (7.83×1.97inch) about 315g; 200×55mm (7.87×2.0inch) about 324g
- High quality aluminum material: The main body is made of aluminum alloy material, which is corrosion-resistant and rust proof, high strength and light weight, resistant to pressure and wear
- Damping adjustment: Bike shock absorber adjusts the damping rebound speed through a knob, clockwise - slow, counterclockwise - fast
- 3 stage Lockout: Easy to operate, adapt to terrain such as road/off-road with different locking states
- 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.
- Shaft Upgrade - DV-23AR (2026 New Model) 12mm shaft replaces DV-22AR 10mm, delivers stronger structural support for eBike and MTB riding
- Rebound Control - External dial lets you slow or speed return stroke so the tire stays glued over rock gardens
- Preload Adjustment - Turn the threaded collar to set sag for your rider weight
- Mount Fit - 24mm wide bushing with 8mm ID fits standard frame pivots for direct bolt-on replacement
- 【Product Specifications】The dimensions of this shock absorber are as follows: the distance between the two mounting holes is 165 mm, the travel is 35 mm, and the hole diameter is 13 mm. Please ensure these dimensions are compatible with your bicycle...
- 【Lightweight Air Shock Design】The RX-2PRO features a pneumatic damping structure, offering lighter weight and more responsive performance. Compared to traditional coil spring shocks, the air design significantly reduces unsprung mass, improving...
- 【Precision CNC Machining】Both the shock body and piston rod are precision CNC-machined and paired with a high-quality sealing system, ensuring long-term use without air or oil leakage. The RX-2PRO model also removes the negative air spring valve...
- 【Three-way adjustability】Rebound knob (+ increases damping / – reduces damping), compression adjuster (+ locks out / – opens). The main air chamber pressure can be precisely adjusted according to the rider’s weight and the pressure gauge...
- Size:165×35mm (6.50×1.38inch) about 293g; 190×50mm (7.83×1.97inch) about 315g; 200×55mm (7.87×2.0inch) about 324g
- High quality aluminum material: The main body is made of aluminum alloy material, which is corrosion-resistant and rust proof, high strength and light weight, resistant to pressure and wear
- Damping adjustment: Bike shock absorber adjusts the damping rebound speed through a knob, clockwise - slow, counterclockwise - fast
- 3 stage Lockout: Easy to operate, adapt to terrain such as road/off-road with different locking states
- 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.
This article is part of our complete guide Cycling — browse all our comparisons and buying guides.
Last update on 2026-10-15 / 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.
