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Shimano Ultegra 6750 crankset noise

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Shimano Ultegra 6750 crankset noise

Old 07-25-10, 08:15 AM
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Shimano Ultegra 6750 crankset noise

I recently installed a Shimano Ultegra 6750 compact crankset and 6700 series bottom bracket on my Trek 5200 and am getting a creaking/pinging type sound when climbing in the small ring. I tried climbing in the big ring and doesn't seem to happen This did not happen with my previous Shimano R700 crank. Everything was installed using a torque wrench to the proper spec. here is what I have done to try to resolve the problem.

- 6700 BB threads were greased when installed
- 6750 crank spindle was lightly greased
- 6750 crank spindle splines were greased
- 6750 crank arm pinch bolts were greased
- 6750 chainring bolts were loosened and tightened but not torqued (because I don't yet have a T-30 torx bit for my torque wrench)
- removed 6700 BB and installed previous 6600 BB
- removed rear cassette, cleaned and greased and reinstalled
- removed Look KEO pedals, pulled spindles and greased, cleaned and greased threads, reinstalled.

The noise seems to worsen as a ride continues. As an example, when I replaced the 6700 BB with the 6600 BB, I went for a 6 mile test ride (460 ft of climbing @ 5-12% grade) and the noise was "almost" gone. The next ride was 55 miles with a lot of climbing (3000 ft @ 5-14% grade) and by the end of the ride, the crank/BB area was very noisy. Anyone out there have a similar issue or suggestions to resolve?
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Old 07-25-10, 08:40 AM
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Does the pinging match the rotation of the crank? Have you looked to your chain and front derailer to see if something rubs?

Also, you seem like a thorough mechanic, but is your seatpost greased?
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Old 07-25-10, 09:09 AM
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The noise is random as the crank rotates. The chain has about 600 miles on it and was used with previous R700 and was not a problem previous to the new crank. There is no rub that I can hear and the noise is not a rub type noise, but more like a metallic pinging/creaking sound. the type of sound was leading me to think that is was a bad BB, but after replacing the 6700 BB with the previous 6600 BB and still getting the same noise, I ruled out the BB being bad. the next thing I am going to do is get a T-30 torx bit for my torque wrench and remove, grease and re-torque the chainring bolts.

My seatpost and frame are both carbon, so there is no grease involved.

Thanks for the suggestions.
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Old 07-25-10, 09:38 AM
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Except for the fact that you didn't have this problem with your R700, I'd have said it was the chain hitting the shift ramps on the big ring.

I ride an R600 compact crank set and was bugged by the noise you describe when I first installed it. The was no real pattern to the sound and it took me a long time to figure out that it only occurred on the small ring and only once the chainline started moving off of "straight-line" on the rear...towards the outside. In other words, if the chainline is absolutely straight when I'm on the small ring in front and the 3rd or 4th biggest cog on the back, once I start moving to the smaller cogs, I get that noise you describe.

Again, it's very confusing because it is NOT in time with the crank and I'm not sure I understand why that is...but it is.

It's not the same sound but I found after several hundred miles, I had to re-tighten my 6700 BB as it had developed some play. The symptom was more of a "click", primarily when I was out of the saddle climbing...and like you described, it seemed to worsen as the ride wore on, which suppose means it was just getting looser.
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Old 07-25-10, 10:11 AM
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You should've removed and regreased those chainring bolts an tightened them back up. Chainring bolts is a very good candidate for noise issues.
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Old 07-25-10, 10:21 AM
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Shift ramps. I wouldn't have even thought of that...

I only notice the noise when in small front ring and 3 biggest cogs in rear. I'll have to test tomorrow by riding in small front ring and ALL rear cogs.

I'll have to re-torque the BB again to see if the noise subsides. I also thought of putting some loctite 242 blue thread lock to see if that helps.
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Old 07-25-10, 10:23 AM
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I am going to Sears today to get a T-30 socket bit so I can use it with my torque wrench and remove and regrease the chainring bolts.
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Old 07-25-10, 10:43 AM
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Originally Posted by bikerx68
I am going to Sears today to get a T-30 socket bit so I can use it with my torque wrench and remove and regrease the chainring bolts.
You don't need a torx wrench if you've wrenched on your bike at all. Shimano doesn't even list a torque spec for those.
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Old 07-28-10, 08:37 AM
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Hi,
Even it is quite new check the chain pin by pin and each side separately.
check if every pin sit correctly.
Good luck.
losi
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Old 07-28-10, 02:47 PM
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In troubleshooting this problem, I swapped out my current wheelset for another set that is on my wife's bike and then went for a test ride and the noise was gone. I then took my "bad" wheel to my LBS thinking it was either the bearing in the freehub body and/or the bearings in the rear hub and they confirmed my suspicions and said it was the bearing on the freehub body. They ordered a bearing for the freehub body. Problem solved. Thanks to everyone for the responses.
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