WD-40 is indispensable in many households and workshops, but when it comes to bike maintenance, things are not so simple. Many cyclists reach for it for everything - cleaning the chain, lubricating components, removing rust. But is this really the best choice for your bike? Let's find out when you can use WD-40 and when you should leave it on the shelf.
WD-40 is that one-size-fits-all tool that we're probably all familiar with - it's been solving rusty screws, stuck doors and squeaky hinges for decades in the garage or pantry. Cyclists also often use it to maintain their two-wheelers. But this is where the problems begin. Despite its popularity WD-40 not an ideal agent for all parts of the bike. In fact, in some places where you might be using it routinely, it can do more harm than good! So how do you tell right from wrong when using this iconic bike spray?
WD-40 and the chain: Friend or foe?
Although WD-40 works as a wonderful solution for removing dirt and rust from a bike, it is far from an ideal choice for chain lube. It is mostly WD-40 degreaser, meaning it will remove the existing lube from your chain instead of replacing it with a better one. The result? The chain will quickly dry out and undergo wear, as the friction between the metal parts will be greater.
So if you use WD-40 for chain cleaning, make sure to lubricate it properly afterwards with quality oil, which is adapted to the weather and driving conditions.
When choosing a chain lubricant, it is crucial to adapt it to the driving conditions. If you mostly drive in dry, dusty conditions, will be the best choice dry lubricant, because after application leave it thin, a dry layer that prevents the accumulation of dust and dirt. However, it needs to be applied more often, as it wears out faster. But if you ride in the wet or muddy conditions, use a wet lube that is thicker and protects the chain from moisture and corrosion. This lubricant stays on the chain longer, but attracts more dirt and will require more frequent cleaning. For minimal maintenance and a clean chain, you can choose wax, which offers excellent protection, but requires thorough cleaning and precise application.
But where does WD-40 work?
Despite everything WD-40 it's not completely pointless on the bike. It is excellent for removing rust from metal parts, especially on the frame or pedals. It can also be used to revive rusted brake levers and derailleurs when they need to be loosened. WD-40 can also be useful as a protection against salt oxidation (e.g. if you use your bike in winter when the roads are salted).
Why shouldn't I use it on brakes?
This is where things get complicated. WD-40 on your brakes is one of the biggest mistakes you can make. If you apply it to brake discs or pads, it will greatly reduce friction - which is exactly what brakes need to work effectively! Instead of slowing down the bike, you can finish even faster. If this happens, you will need to clean the brakes thoroughly, often with alcohol or special brake cleaners.
Other misuses of WD-40
Apart from brakes, it should not be used on other parts where long-term lubrication is essential. This includes wheel bearings, where WD-40 will remove much-needed lube, but will not provide sufficient protection and friction will damage parts. It is also unsuitable for the inside of gearboxes and all parts where a specific weather-resistant lubricant is required.
Alternative solutions and tips
Instead WD-40 use lubricants intended specifically for wheels. For chains, choose between oils for dry or wet conditions, depending on where and when you ride. These oils are designed to stay on the chain and provide long-lasting protection that WD-40 cannot do.
Conclusion: WD-40 is a versatile helper, but it has its limitations when it comes to bike maintenance. Use it carefully - only to clean or remove rust, never to lubricate the chain or brakes. For long-term protection and optimal performance of your bike, you should use specialized products that will keep your bike in top shape.
