For many cyclists, the drivetrain is one of the most overlooked parts of a bicycle – until it starts skipping gears, making unpleasant noises or needs an expensive replacement. Yet it's also one of the hardest-working systems on any bike, transferring every watt of your effort to the wheels.
Whether you ride mountain bike, gravel or road, taking care of your drivetrain will improve shifting performance, reduce wear and ultimately save you money. A few minutes of regular maintenance can add thousands of kilometres to the life of your components.
YOUR CHAIN IS THE STARTING POINT
The chain is designed to wear before the more expensive components in your drivetrain. As the pins and rollers gradually wear, the chain effectively becomes longer – a process known as chain stretch (although the metal itself doesn't actually stretch).
If a worn chain is left on the bike for too long, it begins wearing away the teeth on the cassette and chainrings, meaning a relatively inexpensive chain replacement can quickly become a much more costly drivetrain replacement.
As a general guide, inspect your chain regularly and replace it before excessive wear occurs. Having your chain checked with a professional chain wear gauge at your local bike shop is one of the simplest ways to protect the rest of your drivetrain.
KEEP IT CLEAN
A clean drivetrain is an efficient drivetrain.
Dust, mud, sand and old lubricant combine to form an abrasive grinding paste that accelerates wear on every moving part. This is especially true for mountain bikers and gravel riders who regularly encounter dusty trails and muddy conditions.
After wet or muddy rides, clean the drivetrain as soon as possible. For drier conditions, regular cleaning every few rides will prevent dirt from building up.
The best approach is to use a dedicated bicycle drivetrain cleaner or degreaser rather than household solvents, which can damage seals or remove essential lubrication from bearings.
Clean the:
- Chain
- Cassette
- Chainrings
- Rear derailleur pulley wheels
A soft brush and cloth are often all that's needed, while stubborn grime can be removed with purpose-made drivetrain cleaning tools.
LUBRICATE CORRECTLY
Lubrication is just as important as cleaning – but more isn't always better.
Apply lubricant to each chain roller rather than spraying it across the entire drivetrain. After allowing the lubricant to penetrate the chain, wipe away the excess with a clean cloth. Excess lubricant simply attracts more dirt.
Choosing the correct lubricant also makes a significant difference.
Dry lubricants are ideal for dusty conditions and generally stay cleaner, while wet lubricants provide longer-lasting protection during rainy weather and muddy rides. Many premium lubricants are now formulated specifically for different riding conditions, helping maximise both drivetrain efficiency and component life.
DON’T FORGET THE CASSETTE
The cassette experiences enormous loads every time you pedal, particularly on steep climbs or during powerful accelerations.
Keeping the cassette clean prevents grit from wearing down the teeth prematurely. During cleaning, inspect the sprockets for hooked or pointed teeth, which are signs of wear.
Replacing chains before they become excessively worn dramatically extends cassette life.
LOOK AFTER YOUR CHAINRINGS
Front chainrings generally last longer than cassettes but still require regular inspection.
Mud and grit collect between the teeth and around narrow-wide chainring profiles commonly found on modern mountain bikes. Keeping these areas clean improves chain retention and reduces wear.
If shifting begins to deteriorate on multi-chainring bikes or the chain starts slipping under load, worn chainrings could be the cause.
THE SMALL PARTS MATTER TOO
Rear derailleur pulley wheels often receive little attention despite guiding the chain through every gear change.
Over time, dirt accumulates around the pulley wheels, reducing shifting precision and increasing drivetrain friction.
During routine cleaning, remove any built-up grime and check that the pulley wheels spin freely. Worn pulley wheels are relatively inexpensive to replace and can noticeably improve shifting performance.
RIDE SMOOTHLY
How you ride also influences drivetrain lifespan.
Avoid shifting gears while applying maximum power, particularly during steep climbs. Instead, ease off pedal pressure slightly during each shift, allowing the chain to move cleanly between gears.
Cross-chaining – using the largest chainring with the largest cassette sprocket or the smallest chainring with the smallest sprocket – also places unnecessary stress on the drivetrain and should be avoided where possible.
MAKE MAINTENANCE PART OF YOUR ROUTINE
One of the biggest mistakes cyclists make is waiting until something sounds wrong.
A quick inspection after each ride, regular cleaning, correct lubrication and timely chain replacement can easily double the lifespan of your drivetrain components while keeping your bike quieter, smoother and more enjoyable to ride.
If you're unsure whether your drivetrain needs attention, the workshop team at Lynnwood Cyclery can inspect your chain for wear, assess the condition of your cassette and chainrings, recommend the most suitable cleaning and lubrication products for your riding conditions, and keep your bike shifting as smoothly as the day it left the shop.
After all, looking after your drivetrain isn't just about maintenance – it's about protecting your investment and getting the very best performance from every ride.
by Sean Badenhorst