Bicycle Mechanics - Another Mysterious Noise Thread
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05-24-11, 11:42 AM
I have a 2010 Trek Madone 5.9 frame with a smattering of all kinds of Shimano parts for the groupset. I had a pretty crappy frame before (comparatively, that is). It was a used Leader TT frame. Also, I'm a big guy: 200+, 6'4", but like 14% body fat.
The problem: When I get out of the saddle and dance on the pedals, there's a creaking sound. It occurs with the downward force of my pedal stroke bilaterally. Is it in my bottom bracket? I also had a sneaking suspicion that it is caused by over-tightened chain-ring bolts. Is this a possibility?
05-24-11, 12:27 PM
It could be your BB or your cranks or your pedals . Check all for thighting . The cranks would be were I would start .
05-24-11, 01:05 PM
Could it be that I'm actually too big/heavy for my bike?
05-24-11, 01:27 PM
Try tightening the front QR. It sounds like it comes from the BB when you are pedaling hard. Discovered this by accident on a friends 5200.
05-24-11, 04:17 PM
No ,you are not to big for your bike . it just a adjustment you need to find and fix .
05-30-11, 04:41 PM
So it looks like a chain lubing and tightening the front QR (much to my surprise) got ri dof most of my noise. This has caused me to ask a few more questions:
I am riding Mavic Open Pros. How's the lateral stability on those? As frames go, is it true the Treks are highly laterally stiff? Also, I lube my chain infrequently with TriFlo. What's a better way to lube without the gunky buildup?
Thanks for the responses so far.
As the tension in the chain rises it's need for serious lubrication increases proportionately. Tri-flow and other teflon based lubed may be fine for 140# riders tooling around the park at 10mph, but as a heavy rider who mashes up hills you need something more serious. (consider the source here - I make chain lube).
The problem is that more viscous, higher film strength lubes attract dirt, so you have 2 basic choices. Use a lube/solvent lube and clean and lube often, or use a heavy mineral oil or grease that stays in pretty well and lube less frequently, but dry wipe the chain to keep it reasonably clean.
Open Pros are fine for whatever you can dish out, but it depends on the build. 32 or 36 spokes, with a well executed build will be fine, but obviously you're more likely to bend or dent them than a ballerina. One thing you can do to help yourself is use larger section tires for the same reason that trucks have bigger tires than sports cars. A larger tire will increase rim/ground clearance reducing the chance of rim damage on sharp bumps and will be efficient at lower pressure reducing the stress transmitted to the rim.
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