35 Chain vs 420: Which One Should You Choose for Your Bike?
35 Chain vs 420: Which One Should You Choose for Your Bike?
Keyword: 35 chain vs 420
Choosing the right drivechain for your motorcycle or pit bike is more than a mechanical decision—it is a performance statement. Riders often find themselves stuck between two popular sizes: the lightweight **35 chain** and the robust **420 chain**. Both have loyal followings, but they serve very different riding styles and power outputs. This guide breaks down the differences in strength, speed, durability, and maintenance to help you make an informed choice.
Understanding Chain Dimensions and Pitches
Before diving into performance, it is critical to understand the physical specs. The numbers in chain sizes refer to the pitch (distance between pins) and the width. A **#35 chain** has a pitch of 3/8 inch (0.375 inches) and is typically used in light-duty applications like go-karts, mini bikes, and small displacement engines. In contrast, a **420 chain** features a 1/2 inch pitch (0.500 inches) with wider rollers and thicker side plates. This extra material directly translates into higher tensile strength, making the 420 the default choice for street motorcycles, dirt bikes, and larger pit bikes.
Strength and Load Capacity: The Core Differencial
The biggest question riders ask is about load handling. The **420 chain** offers a tensile strength of roughly 4,500 to 5,000 pounds, depending on the manufacturer and grade (standard, X-ring, or O-ring). This makes it suitable for engines producing over 125cc and up to 400cc in some aggressive riding scenarios. The **35 chain** typically maxes out at around 2,600 to 3,100 pounds of tensile strength. If you are running a stock 50cc or 110cc engine, the 35 is fine. But if you are pushing aggressive throttle on a tuned pit bike, the 420 will prevent dangerous snap failures. In a direct [35 chain vs 420](https://www.motomaxsfr.com/420-chain-vs-35-chain-which-is-better-for-top-speed/) battle for ruggedness, the 420 wins decisively.
Top Speed and Acceleration: Which One Is Faster?
Speed is not just about chain size—it is about sprocket ratios. However, chain weight and friction play a hidden role. The **35 chain** is lighter, which reduces rotating mass. This allows the engine to rev faster, yielding quicker acceleration on small-displacement bikes. If your goal is to win a short drag race on a 50cc pit bike, the 35 chain can give you a slight edge in throttle response. Conversely, the **420 chain** is heavier but handles high torque without stretching. On a 150cc or 250cc engine, the 420 is more efficient at transferring power to the rear wheel without flexing or losing energy. For sustained top speed on larger engines, the 420’s stability wins, as the 35 chain risks whipping and vibration at high RPM.
Durability and Maintenance: Wear and Tear
Dirt, mud, and heat are the enemies of any chain. The **35 chain** is often unsealed (plain roller), meaning it requires frequent lubrication and cleaning. It is prone to rust and dirt ingestion, which accelerates wear. The **420 chain** offers better versions with O-rings or X-rings, which seal grease between the pins and bushings. This drastically reduces maintenance frequency and extends lifespan. If you ride off-road or in rainy conditions, the 420 is a no-brainer. The added weight is a worthwhile trade-off for reliability and fewer roadside repairs.