The rise in popularity of mountain bikes has resulted in keen competition among manufacturers. Typical of many automakers, some manufacturers add bell-and-whistle accessories to attract consumers, while more concerned manufacturers bring the latest frame technology into the design equation. With or without the advances, your mountain bike frame is vulnerable to incidents and situations that can lead to noises.
Construction
Logic might dictate a particular material or thickness of tubing is best for mountain bike frames. However, bicycle frames remain a matter of personal preference. Welded steel has certain strength advantages over welded aluminum, but weight is a factor. Aluminum is lighter, but hard riding and spills can create problems. Manufacturers that use titanium boast lightweight frames that better resist damages.
Connections
Walk around your mountain bike and count the numerous welded connections. You'll find these where the upper and lower frame tubes connect to the steering headset. There are also welds where the vertical seat tube and lower frame tube attach to the bottom bracket. Notice the ends of the rear frame arms where the dropouts are welded to the arms. Finally, count the number of welded hubs for attaching suspension, brake arms, derailleurs and cable stops to the frame. Any of these welds can be a source of noise.
Evaluation
Ride your bike on a gravel or dirt path and listen carefully. Try to determine what part of the frame the noise is coming from. Inspect that area for cracks in a weld. Hold the bike steady and push sideways on the frame with your foot or pull the frame by hand in that area. In most cases, this opens a crack making it more visible. If you find a crack, visit your bike shop or mechanic for an expert opinion.
Accessories
Not all noises that sound like they're coming from the frame are frame-related. Bottom brackets are known to loosen over time and rattle in the bottom bracket hub. A loose chain can drag against the bike frame in certain situations. The compression collar that secures the seat post in the frame may be damaged. A loose derailleur, loose brake arms or a loose chain guard may make noises when turning or riding on hills. Include an inspection of all bolted connections and attachments as part of your routine.
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