My mate and I purchased bikes. I got a Norco HT 2 and he has a Norco FS 3.
On paper we have the same hubs but mine is silent, and his is decently loud when coasting. Why is that?
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Something happening inside the freehub is different. Possible variants that I can think of:
One hub has more or different thicker grease on its pawls (or equivalent parts responsible for enforcing the one-way rotation). The grease adds "liquid" friction between the parts, preventing them from smashing as fast against each other with every step of the ratcheting mechanism. Without enough kinetic energy present in pawls to be dissipated as heat/sound, the clicking is not as loud.
One hub is older/newer, and its pawls are worn/fresh. Again, the pattern of the pawls striking against their counterparts may affect how loud the sound will be.
Hubs have slightly different internal design even if they are marked with the same model name. Their internal components may be from different production batches, or minor revisions can be made without changing publicly visible names of products.