Cycling and bicycle discussion forums. 
   Click here to join our community Log in to access your Control Panel  


Go Back   > >

Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

User Tag List

Reply
 
Thread Tools Search this Thread
Old 05-24-11, 10:42 AM   #1
youngmrzee
Junior Member
Thread Starter
 
Join Date: Sep 2009
Location: Bakersfield, Ca and Davis, Ca
Bikes: Leader 720 TT frame
Posts: 21
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Another Mysterious Noise Thread

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?

Thanks, BF.
youngmrzee is offline   Reply With Quote
Old 05-24-11, 11:27 AM   #2
bikeman715
Senior Member
 
bikeman715's Avatar
 
Join Date: Mar 2008
Location: Salinas , Ca.
Bikes: Bike Nashbar AL-1 ,Raligh M50 , Schwinn Traveler , and others
Posts: 2,447
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
It could be your BB or your cranks or your pedals . Check all for thighting . The cranks would be were I would start .
bikeman715 is offline   Reply With Quote
Old 05-24-11, 12:05 PM   #3
youngmrzee
Junior Member
Thread Starter
 
Join Date: Sep 2009
Location: Bakersfield, Ca and Davis, Ca
Bikes: Leader 720 TT frame
Posts: 21
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Could it be that I'm actually too big/heavy for my bike?
youngmrzee is offline   Reply With Quote
Old 05-24-11, 12:27 PM   #4
davidad
Senior Member
 
Join Date: Feb 2009
Bikes:
Posts: 4,949
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
Quoted: 40 Post(s)
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.
davidad is offline   Reply With Quote
Old 05-24-11, 03:17 PM   #5
bikeman715
Senior Member
 
bikeman715's Avatar
 
Join Date: Mar 2008
Location: Salinas , Ca.
Bikes: Bike Nashbar AL-1 ,Raligh M50 , Schwinn Traveler , and others
Posts: 2,447
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 12 Post(s)
No ,you are not to big for your bike . it just a adjustment you need to find and fix .
bikeman715 is offline   Reply With Quote
Old 05-30-11, 03:41 PM   #6
youngmrzee
Junior Member
Thread Starter
 
Join Date: Sep 2009
Location: Bakersfield, Ca and Davis, Ca
Bikes: Leader 720 TT frame
Posts: 21
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
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.
youngmrzee is offline   Reply With Quote
Old 05-30-11, 04:10 PM   #7
FBinNY 
Senior Member
 
Join Date: Apr 2009
Location: New Rochelle, NY
Bikes: too many bikes from 1967 10s (5x2)Frejus to a Sumitomo Ti/Chorus aluminum 10s (10x2), plus one non-susp mtn bike I use as my commuter
Posts: 30,875
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 887 Post(s)
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.
__________________
FB
Chain-L site

An ounce of diagnosis is worth a pound of cure.

“Never argue with an idiot. He will only bring you down to his level and beat you with experience.”, George Carlin

“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN

WARNING, I'm from New York. Thin skinned people should maintain safe distance.
FBinNY is online now   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -6. The time now is 11:23 PM.