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Chains & Master Links

Motorcycle Drive Chains & Master Links

The drive chain is one of the simplest and most elegant power transmission systems ever put on a motorcycle. A series of precision-manufactured links, pins, bushings, and rollers that convert rotational force from the countershaft sprocket into forward motion at the rear wheel with an efficiency that belt and shaft drive systems struggle to match. Simple in concept, demanding in execution. The tolerances inside a quality drive chain are tighter than most riders realize, and the difference between a chain built to those tolerances and a cheap imitation that is not becomes apparent quickly in stretched pitch, inconsistent tension, and a drivetrain that never feels precise regardless of how carefully it is adjusted and lubricated.

Chain selection is a decision that affects how your drivetrain performs, how long it lasts, and how much maintenance it demands across its service life. The right chain for a two-stroke motocross racer who replaces it every few races is very different from the right chain for an adventure tourer who wants maximum service life with minimum maintenance across thousands of miles of mixed terrain. Understanding the differences between chain types and sizes puts you in the position to make a choice that serves your specific machine and your specific riding rather than defaulting to whatever came on the bike from the factory. Mad Lads Moto stocks drive chains and master links for dirt bikes, motocross bikes, enduro machines, trail riders, street bikes, and adventure tourers across all major chain sizes and configurations. Here is what we carry:

  • Standard Non-Sealed Chains - Lightweight non-sealed drive chains for motocross and racing applications where chain weight is a priority, replacement frequency is high, and the chain will be lubricated and maintained as part of a regular pre-ride routine rather than relying on internal lubrication retention.
  • O-Ring Chains - Sealed O-ring drive chains that use rubber seals between the inner and outer link plates to retain grease at the pin and bushing interface where chain wear actually occurs, dramatically extending service life compared to standard chains in exchange for a modest weight increase.
  • X-Ring Chains - Premium X-ring sealed chains that use a modified X-profile seal that reduces friction compared to standard O-ring seals while maintaining the same internal lubrication retention advantage, making them the preferred choice for street, enduro, and adventure applications where maximum chain life and minimum friction losses are both priorities.
  • Heavy Duty Chains - Reinforced heavy duty drive chains for larger displacement machines, modified engines with increased power output, and applications where standard chain ratings are insufficient for the torque loads the drivetrain generates.
  • Master Links - Clip-type and rivet-type master links in all common chain sizes for chain installation, chain repair, and chain length adjustment, available as individual components and as part of complete chain purchases.
  • Chain Size Reference - Common motorcycle chain sizes include 420 for small displacement two-strokes and youth bikes, 428 for small to mid-displacement machines, 520 for most full-size dirt bikes and mid-displacement street bikes, 525 for larger street bikes and adventure tourers, and 530 for large displacement street and cruiser applications. Always confirm your machine's chain size before ordering.

Master link installation method is one of the most important and most commonly mishandled aspects of drive chain maintenance. Clip-type master links are quick and convenient but must be installed with the closed end of the clip facing the direction of chain travel so the clip cannot be dislodged by contact with chain guides or sprockets. A clip installed backwards is a clip waiting to fly off at the worst possible moment and leave you with a broken chain. Rivet-type master links are significantly more secure than clip types and are the preferred connection method for any machine ridden hard, jumped, or used in conditions where the consequences of a chain failure are serious. A proper chain riveting tool is required to peen the rivet ends to the correct flare diameter, and attempting to rivet a master link with a hammer and punch produces an under-riveted link that can fail under load. We stock drive chains and master links for Honda, Yamaha, Kawasaki, Suzuki, KTM, Husqvarna, Beta, GasGas, and more. Use our year, make, and model fitment tool to confirm the correct chain size and type for your specific machine before you order.

How often should I lubricate my motorcycle drive chain?

For street riding under normal dry conditions, lubricating the chain every 300 to 500 miles is a reasonable baseline maintenance interval. In wet weather, after rain riding, or in dusty off-road conditions where contamination is heavy, lubricate after every ride or every other ride. The goal of chain lubrication is to keep the rollers, pins, and bushings on a non-sealed chain protected from rust and wear, and to keep the outer surfaces of a sealed chain clean and the O-rings or X-rings supple. Apply chain lubricant to the inner side of the chain where it contacts the sprocket teeth with the bike on a stand, rotating the wheel slowly to coat the full length of the chain. Wipe off any excess lubricant from the outside of the chain after application to prevent it from being flung onto the rear tire where it reduces traction. Always apply lubricant to a warm chain immediately after a ride rather than a cold chain before a ride for best penetration and adhesion.

What is the correct chain tension for my motorcycle?

Correct chain tension is specified in your motorcycle's service manual as a measurement of free play at a specific point on the lower chain run, typically measured in millimeters at the midpoint between the front and rear sprockets with the motorcycle on a stand and a rider's weight on the seat. Most dirt bikes specify between 35 and 55 millimeters of slack at that point, while street bikes and ADV machines typically specify tighter tensions in the 20 to 30 millimeter range depending on the specific model. Chain tension must be checked with the suspension loaded as it is during riding, not with the bike on a stand and the suspension fully extended, because the chain tightens as the rear suspension compresses and a chain that is correctly tensioned with the suspension extended will be too tight under rider weight. A chain adjusted too tight puts excessive load on the countershaft bearing, output shaft seal, and chain itself. A chain adjusted too loose risks contacting the swingarm or jumping sprocket teeth under hard acceleration.

What is the difference between 520 and 525 chain and can I convert between them?

The numbers in a chain size designation refer to the pitch and width of the chain. The first digit or digits indicate the pitch in eighths of an inch, so a 520 chain has a pitch of five eighths of an inch and a 525 has the same pitch. The last two digits indicate the inner width of the chain in eightieths of an inch, so a 520 chain is twenty eightieths wide and a 525 is twenty-five eightieths wide. The 525 is a wider, heavier, and stronger chain used on larger displacement and higher-torque applications. Converting from a 530 or 525 chain to a 520 is a common weight-reduction modification on street bikes and large four-stroke dirt bikes where the engine's torque output is within the 520's rating, and requires replacing both sprockets with 520-compatible units along with the chain since the sprocket tooth width must match the chain inner width. Never run a chain on sprockets designed for a different chain width.
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