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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.

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Old 02-21-10, 05:01 PM   #1
FOBx530
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bottom bracket for dura-ace 7700?

So I got a dura-ace crankset 7700 for 25$ yes there are scratches but structurally it's fine, not warped or untrue.

That was a steal!

Now the problem is the bottom bracket and correct if I'm wrong, thats why I'm here for help.



I think it needs 68mm 109.5 octalink type bottom bracket,

but everytime I goto a bike shop, it's over 50$+ for the bottom bracket...let it be BB-5500 or BB-6500. WHY IS IT SO EXPENSIVE FOR AN OLD BOTTOM BRACKET?

I was wondering would it be a good idea to use a ES-25 bottom bracket? except they don't have 109.5, I think the shortest they have are 113, would this be a problem?





Note*******My current crank is a FSA Veloce double chainring but I'm running ONLY the larger outter chainring and removed the small inside chainring while running a 9 speed in the back.
MY CHAIN DOES NOT COME OFF when shifting into any of these speeds.
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Old 02-21-10, 05:08 PM   #2
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http://bikeisland.com/cgi-bin/BKTK_S...ls&ProdID=1273

will this fit the 7700 dura-ace crank? the length is a bit shorter...is it ok?
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Old 02-21-10, 05:16 PM   #3
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You're gonna just have to suck it up and buy a 5500 bb if you want to use that crank
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Old 02-21-10, 05:39 PM   #4
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You gotta good deal on the crank now suck it up and drop 50 bucks to use it
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Old 02-21-10, 05:57 PM   #5
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Quote:
Originally Posted by FOBx530 View Post
http://bikeisland.com/cgi-bin/BKTK_S...ls&ProdID=1273

will this fit the 7700 dura-ace crank? the length is a bit shorter...is it ok?
ISIS and Octalink aren't compatible...you need one of the few Shimano bb's that work with that crank (it's a v.1 Octalink, too btw). http://sheldonbrown.com/bbsize.html#shimano
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Old 02-21-10, 06:20 PM   #6
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Quote:
Originally Posted by FOBx530 View Post
I was wondering would it be a good idea to use a ES-25 bottom bracket? except they don't have 109.5, I think the shortest they have are 113, would this be a problem?
The length isn't the issue, the design is. There were two "Octalink" configurations, V1 and V2. V1 was used on road cranks; Dura Ace, Ultegra and 105 and, IIRC, XTR. V2 was used on the lower MTB groups and one low-line road group.

So, your DA crank needs a V1 bb and the ES-25 is a V2.

Licktons has the BB-5500 in 109.5 for $40 here: http://www.lickbike.com/productpage....B='0229-13'

Buy the right one.
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Old 02-22-10, 02:57 PM   #7
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CBO has the BB-5500 for $21.95 + $7 shipping. Best deal around. I just bought one.

http://www.cambriabike.com/shopexd.a...Bottom+Bracket
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Old 02-22-10, 03:47 PM   #8
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Me too! Thanks for the tip...
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