If your bike is making noise other than say the sound of rubber tyres swishing along, or maybe your gears changing, then it’s likely there is something that needs your attention. In this video, Jon shows you how to fix your noisy bike.
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Scraping or Grinding sounds
The sound of your chain making noise could very likely be due to the indexing of your gears being not quite right. What I mean by this is that the chain is not correctly engaging with the sprocket that the derailleur is asking it to. The easiest way of checking this out is to shift gear into the sprocket at the rear with the least number of teeth. Now it’s there, have a look from behind the bike and check that the guide pulley, so the upper one, is directly beneath that sprocket. Now, unclamp that cable and wind in the barrel adjuster if you have one, and then pull the cable through the clamping bolt again, so it has a decent amount of tension, then clamp the cable. Now whilst turning the pedals give the gear lever a click into an easier gear so that the rear derailleur moves inwards towards the centre of the bike.
Clicking
A clicking sound when pedalling is probably one of the most irritating things you can have.
But, what could it be exactly? Firstly, perhaps it’s the bottom bracket, so this is the junction box if you like for where the chainset sits in the frame of the bike. Bottom brackets that are press fit models, so ones that don't have teeth for a tool to engage with during installation, occasionally get a bit of a bad reputation for these noises as they are interference fit and can sometimes move around slightly, rather than thread fit models that are firmly in place.
Rattling
Final one. The rattle. This can be a fairly easy one as the “rattle” noise tends to be the loudest so the easiest to find and importantly lose. A big culprit here can be outer cables, bouncing onto the frame or sometimes, inside of a frame. Have a look at any cables and check for paint wear underneath, that could be the cause of the rattling. And a good idea here would actually be to put a piece of self-adhesive frame protector where the cable touches the frame as both a possible solution to the rattle as well as saving your paintwork.
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