Replace Shimano Dura Ace BB 7700?
11-17-20, 10:00 PM
#1
Newbie
Thread Starter
Replace Shimano Dura Ace BB 7700?
I am getting a clicking sound coming from my bb when i pedal, so it seems to be asking for some attention. The question is, should i repack, replace the bearings and fuss with the 7700? Or replace with a sealed cartridge bb... and if it is choice B, should i consider the bb 7710, which is said to not be so waterproof? or just go to the bb 5500 (105)? the ultegra bb 6500 is not so available or I would probably go that way.
The bike is a 2003 Bianchi San Lorenzo.
The bike is a 2003 Bianchi San Lorenzo.
11-18-20, 03:17 AM
#2
Blamester
I am getting a clicking sound coming from my bb when i pedal, so it seems to be asking for some attention. The question is, should i repack, replace the bearings and fuss with the 7700? Or replace with a sealed cartridge bb... and if it is choice B, should i consider the bb 7710, which is said to not be so waterproof? or just go to the bb 5500 (105)? the ultegra bb 6500 is not so available or I would probably go that way.
The bike is a 2003 Bianchi San Lorenzo.
The bike is a 2003 Bianchi San Lorenzo.
Remember this was made in Japan when they made the best most reliable components in history.
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11-18-20, 06:04 AM
#3
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Thanks - good to know. What grease to you use? There are many opinions on that floating around...
11-18-20, 06:23 AM
#4
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Isn't a BB 7700 a sealed cartridge unit?
11-18-20, 06:29 AM
#5
Blamester
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11-18-20, 07:04 AM
#6
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11-18-20, 07:17 AM
#7
Blamester
They are basically caged bearings. 4 sets two each side. Check shimano tech docs for a diagram and installation.
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11-18-20, 07:18 AM
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My memory of 7700 was unpleasant, clicking common, pain to adjust, switch to ultegra if you can find one. Only DA part that I would say I did not love.
11-18-20, 08:28 AM
#9
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11-18-20, 10:52 AM
#10
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7703 (triple) is a normal sealed cartridge.
7710 (NJS track) is a normal sealed cartridge.
7700 requires adjustment and maintenance. But like most loose/caged cup cone bearings on a bike there will probably be less resistance, when properly adjusted, over a sealed cartridge.
The debate will be whether there is any noticeable impact on the performance of a bottom bracket.
As for the OP’s original question, I believe a 7710 will be fine. I’m not sure how much of an appreciable difference there is over a 105. In theory it “should” be better against the elements. I believe there is a slight weight penalty with the 7710, if that matters.
I tend to see the 7703 and 7710 Dura Ace bottom brackets more in just name, similar to Dura Ace bar end shifters, than a true race oriented design.
John
7710 (NJS track) is a normal sealed cartridge.
7700 requires adjustment and maintenance. But like most loose/caged cup cone bearings on a bike there will probably be less resistance, when properly adjusted, over a sealed cartridge.
The debate will be whether there is any noticeable impact on the performance of a bottom bracket.
As for the OP’s original question, I believe a 7710 will be fine. I’m not sure how much of an appreciable difference there is over a 105. In theory it “should” be better against the elements. I believe there is a slight weight penalty with the 7710, if that matters.
I tend to see the 7703 and 7710 Dura Ace bottom brackets more in just name, similar to Dura Ace bar end shifters, than a true race oriented design.
John
11-18-20, 12:57 PM
#11
Senior Member
This might help. I thought that was too complex. https://si.shimano.com/pdfs/si/SI-1TG0H-001-ENG.pdf
