The TIME MX 4 [paid link] pedals have earned a strong reputation among cross-country and gravel riders for their reliability, intuitive engagement, and mud-clearing efficiency. However, they often get compared to the Shimano PD-M520, one of the most popular clipless pedals on the market. While both are designed for off-road use, their performance characteristics, construction, and maintenance requirements reveal distinct differences that affect how they feel and perform on the bike. This article provides a comprehensive technical comparison between the TIME MX 4 [paid link] and Shimano PD-M520, examining installation, adjustment, performance, and long-term maintenance to help riders choose the right pedal system.
Build Quality and Design Philosophy
The TIME MX 4 pedals are constructed using a composite body paired with a hollow steel axle, balancing low weight and high durability. TIME’s ATAC (Auto Tension Adjustment Concept) system defines their engagement mechanism, offering a self-cleaning design that automatically sheds mud and debris during use. The cleat interface provides a generous contact area for improved power transfer and comfort on longer rides.
In contrast, the Shimano PD-M520 pedals feature a more traditional two-sided SPD mechanism made of full steel, prioritizing robustness and longevity over weight savings. The design requires more manual maintenance in muddy conditions but provides a familiar, mechanical feel appreciated by many riders. Shimano’s spring-tension system also offers a more consistent mechanical engagement but is less forgiving in debris-heavy environments.
While both designs are durable, the TIME MX 4 is optimized for riders who value lightweight construction and easy engagement, whereas the PD-M520 appeals to those who prioritize rugged simplicity and serviceability.
Installation and Setup Differences
Both the TIME MX 4 and Shimano PD-M520 pedals use a 15 mm pedal wrench [paid link] or 8 mm hex key for installation. The threading standard (9/16″ x 20 TPI) is identical, making either pedal compatible with all modern cranksets. However, there are subtle setup distinctions worth noting.
The TIME MX 4 requires the installation of ATAC-specific cleats, which offer a choice between 13° and 17° release angles, depending on the direction of cleat mounting. This allows riders to fine-tune the feel of entry and exit, providing a personalized level [paid link] of float and release sensitivity. In contrast, Shimano’s SPD cleats offer a single release angle unless upgraded to the optional multi-release version, limiting customization.
TIME’s cleat bolts should be torqued to 5 Nm, while Shimano’s SPD cleats typically require 5–6 Nm. Both systems rely on clean, lightly greased threads to prevent corrosion, though TIME’s cleats benefit from a thin application of anti-seize to avoid galvanic reactions between the steel bolts and aluminum shoe plates.
Engagement and Float Characteristics
One of the most distinctive differences between the two models lies in how they engage and allow rider movement.
The TIME MX 4 provides 10° of angular float and 2.5 mm of lateral float, making it significantly more forgiving to the knees and ankles. The self-cleaning ATAC system engages with a single downward motion, even when mud or grit is present. This float range allows riders to maintain natural pedaling biomechanics without the locked-in feeling some SPD users experience.
Conversely, the Shimano PD-M520 has roughly 4° of float and 1 mm of lateral movement, resulting in a firmer, more direct pedaling connection. This setup is ideal for riders who prefer a tight, mechanical feel between shoe and pedal. However, in extremely muddy conditions, SPD systems can occasionally struggle to clip in cleanly, requiring manual clearing of debris.
For riders seeking comfort and knee protection, the TIME MX 4 offers superior float dynamics, while the Shimano PD-M520 delivers a more performance-focused, race-style engagement.
Tension Adjustment and Customization
The Shimano PD-M520 features a visible spring-tension adjustment screw on each side of the pedal, allowing riders to fine-tune release resistance easily. This is beneficial for those who frequently switch shoes or prefer a specific release feel.
In contrast, the TIME MX 4 uses a fixed-tension ATAC mechanism that automatically adapts to the cleat’s wear pattern. While this simplifies setup, it also means tension cannot be manually adjusted. The design instead relies on cleat positioning and orientation to modify release behavior.
Riders who prefer a “set-and-forget” approach will appreciate TIME’s self-adjusting tension system. However, those who demand precise customization of pedal resistance may find the Shimano SPD mechanism more appealing.
Bearing Systems and Maintenance
The TIME MX 4 utilizes a combination of cartridge bearings and bushings, designed for smooth rotation and extended service intervals. Its sealed internals effectively resist water and grit ingress, though TIME recommends annual servicing for riders frequently exposed to wet or muddy terrain. The process involves removing the axle, cleaning old grease, and re-lubricating with a light waterproof grease.
The Shimano PD-M520 also employs cup-and-cone style bearings, a hallmark of Shimano engineering. These can be fully disassembled, cleaned, and re-greased using standard bicycle tools. Although the system requires more frequent attention, it allows for virtually unlimited service life if maintained properly.
In essence, TIME’s design prioritizes low maintenance, while Shimano’s offers high serviceability for riders comfortable with periodic rebuilds.
Durability and Longevity
Both pedals perform well under demanding use, but their material choices influence wear characteristics. The composite body of the TIME MX 4 is lighter yet slightly more susceptible to cosmetic damage from rock strikes. Shimano’s all-metal PD-M520, on the other hand, withstands impacts better but adds approximately 70 grams of additional weight.
TIME’s ATAC cleats [paid link] typically last 1,500–2,000 km, depending on riding conditions, while Shimano’s SPD cleats often exceed 3,000 km due to their thicker, hardened steel construction. Replacement cleats are readily available for both brands, though TIME’s are generally more expensive.
Ride Feel and Intended Use
The TIME MX 4 excels in gravel, cyclocross, and light trail riding, offering a supple pedaling feel and rapid mud clearance. Riders who frequently dismount and remount—such as in technical terrain or cyclocross racing—benefit from the effortless engagement.
The Shimano PD-M520, however, caters to mountain and touring cyclists who prioritize consistency, simplicity, and long-term durability. Its solid platform and firm retention make it a dependable choice for extended rides in mixed conditions.
Ultimately, the TIME MX 4 emphasizes comfort and ease of use, while the PD-M520 highlights mechanical precision and resilience.
Final Verdict: Which Pedal Should You Choose?
The choice between the TIME MX 4 and Shimano PD-M520 depends on your riding style, maintenance preferences, and desired pedal feel.
- Choose TIME MX 4 if you value low maintenance, superior float, and reliable engagement in muddy conditions.
- Choose Shimano PD-M520 if you prefer adjustable tension, full metal durability, and complete serviceability.
For riders seeking knee comfort and effortless engagement, the TIME MX 4 remains one of the most balanced and forgiving pedals in its class. Shimano’s PD-M520, meanwhile, continues to set the benchmark for durability and precision, making it a long-standing favorite among performance-focused cyclists.