Inspection and maintenance of your mountain bike's suspension
At Tuvalum we understand how important it is to keep your bike in perfect condition. Whether you're passionate about enduro or cross-country, a well-maintained suspension improves comfort, safety, and performance. Below you'll find a guide to understanding how your MTB suspension works, which checks you can do yourself, and when it's best to see a mechanic.
How does MTB suspension work?
Main elements: spring and damper
Suspensions, both the front fork and the rear shock, are based on two elements:
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Spring: can be air (pressurized cartridge) or steel. The spring supports the weight and determines the travel. The air option allows you to adjust the pressure according to the rider's weight.
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Hydraulic damper: controls the speed of compression and rebound of the spring using oil. Its function is to prevent harsh rebounds and keep the wheel in contact with the ground.
Basic adjustments: sag, rebound, and compression
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Sag: percentage of the travel that is compressed when you get on the bike; it's regulated by adjusting the pressure or the spring preload.
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Rebound: controls the speed at which the suspension returns to its initial position after an impact.
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Compression: adjusts how much force is needed to compress the suspension.
Incorrect adjustment can cause fatigue and loss of control.
Why is it important to check the suspension?
A suspension works in tough conditions: dust, mud, and water can get past the seals, contaminate the oil, and wear out bushings and joints. Over time, friction increases and the response becomes imprecise. Inspecting and maintaining the suspension:
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Extends the life of the components.
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Maintains the original performance.
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Prevents costly breakdowns in the future.
Manufacturers recommend a light service (cleaning and oil change of the stanchions) every 30–50 hours of use and a full inspection (replacement of seals, oil, and bushings) every 100–200 hours.
Basic maintenance you can do at home
Cleaning and lubricating stanchions and seals
After each ride, wipe the fork and shock stanchions with a damp cloth to remove dust and mud. Apply a drop of specific lubricant at the junction between stanchion and lower leg, compress the suspension several times to distribute the oil, and wipe off any excess.
Checking pressures and external adjustments
Use a high-pressure pump (shock pump) to check the air pressure of the fork and shock. Adjust the sag according to your weight and type of use. Make sure the rebound and compression controls turn smoothly and there are no oil leaks.
Essential tools for home maintenance
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Microfiber cloths.
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Suspension air pumps.
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Specific lubricant for seals.
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Set of Allen keys and torque wrench for adjusting bolts.
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Soft brush and soapy water to clean without damaging seals.
These tasks do not require advanced knowledge and extend the life of the suspension.
Advanced maintenance: when to go to the mechanic
Replacing oil and seals
Every 30–50 hours it's advisable to do a lower leg oil change (lower leg service). It's a relatively simple process, but it requires specific tools, replacement seals, and the right oil. If you don't have experience, it's best to go to a workshop, as incorrect assembly can cause leaks or even internal damage.
Hydraulic cartridge and bushing inspection
A full inspection involves disassembling the hydraulic cartridge, replacing O-rings, bushings, and refilling with oil of the correct viscosity. The play in the fork bushings and the condition of the springs are also checked. This work requires technical knowledge and specialized tools, so it is recommended to have it done at an official service center.
Problem indicators and approximate costs
Signs that indicate your suspension needs professional attention:
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Loss of sensitivity or travel blockage.
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Visible oil leaks around the seals.
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Metallic noises or knocking when compressing.
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Notable change in behavior (slow or fast rebound without adjustment).
Prices vary depending on the brand and model, but usually range between €70 and €150 for a light service and between €150 and €250 for a complete fork and shock inspection.
Tips to extend the lifespan of your suspension
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Adjust the correct pressure according to your weight and riding style.
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Avoid using pressure washers directly on the seals.
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Keep the bike clean and dry after each ride.
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Track hours of use or distance ridden to plan services.
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Consult the manufacturer's manual to know the recommended maintenance frequency.
Take care of your MTB with the help of Tuvalum
The suspension is one of the most demanding components of a mountain bike. Regular inspection and proper maintenance ensure safety and performance on your rides. Perform basic tasks at home to keep it clean and lubricated, and trust professionals for full inspections. At Tuvalum you will find certified mountain bikes and advice to keep your equipment always ready.
Tuvalum Team
