NordicTrack C 900 I Treadmill Support Question
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Question posted by tdocherty70 on February 2nd, 2017
Nordic Track Gx8.0 Bike
Current Answers
Answer #1: Posted by Troubleshooter101 on February 2nd, 2017 9:24 PM
- Do I hear the noise when I'm pedaling or coasting or both?
- Is the noise rhythmic? And if so, does the rhythm's tempo increase with the speed of the bicycle or the speed of my pedaling?
- Which gear(s) is the bicycle in when I hear the noise?
- Is the noise present when I'm standing or sitting on the bike or both?
- Is the noise present when I start my ride or does it only manifest after a few miles?
- If the noise is non-rhythmic can I create the noise on smooth pavement by shifting my weight and/or pulling and pushing on the handlebars? Or can I only hear it on rough pavement?
- What do I have to do to create the noise at will?
But it's still challenging to diagnose the source
Unfortunately noises that your bicycle makes are very hard to isolate directionally. Noises that are coming from the saddle can sound like they are originating from the handlebar. When riding, all the parts of the bicycle are the same distance away from each of our ears, and because the sound waves are traveling such a short distance our directional sense is often fooled. Add to that the ability of the sound-causing vibrations to resonate all through your frame and you have a hopeless situation when trying to hear what part of your bike a noise is originating from. If the noise is loud enough for your riding partner to hear, getting him/her to ride next to you to try to identify where the noise is coming from can be helpful. Usually it is possible to tell if the noise is coming from the front, middle, or back of someone else's bicycle.
Rhythmic noises that keep time with your pedaling cadence are the most common and very difficult to track down. Many times this class of noise originates from the crank/bottom bracket area. However, a rider's weight will shift from side to side and there is a corresponding push/pull on the handlebars, especially noticeable with a hard pedaling effort. These secondary forces are frequently responsible for causing rhythmic sounds that come from the saddle, seat post, stem, or wheels and not from the crank where we intuitively expect cadence timed rhythmic sounds to come from.
Thanks
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Troublshooter101
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