The Mountain Bike Fork Sponge Ring 30-40mm Dustproof Oil Absorber is a dense, seamless sponge insert for 30–40 mm forks. It’s produced with a 5x heat compression process to enhance durability and longevity.
By improving damping, it reduces vibration on rough terrain and delivers a smoother ride with less arm fatigue. It also supports quick visual checks of fork health during maintenance.
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Seamless fit with a tolerance under 0.1 mm for a snug, leak-resistant seal.
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Size options: 30, 32, 34, 35, 36, 38, 40 mm—select the correct fork size.
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Broad compatibility across mountain, road, and folding bikes.
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Enhanced damping reduces harshness and preserves fork sensitivity.
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Diagnostics ready: dry sponge signals oil loss, black sludge indicates wear, and dirt shows seal leaks.
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Dustproof design helps keep grit away from the fork seals.
Fit: compatible with 30–40 mm forks across mountain, road, and folding bikes.
