FOBx530

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.

FOBx530

https://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?

I_bRAD

You're gonna just have to suck it up and buy a 5500 bb if you want to use that crank

cnnrmccloskey

You gotta good deal on the crank now suck it up and drop 50 bucks to use it

bikinfool

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). https://sheldonbrown.com/bbsize.html#shimano

HillRider

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: https://www.lickbike.com/productpage....B='0229-13'

Buy the right one.

dperreno

CBO has the BB-5500 for $21.95 + $7 shipping. Best deal around. I just bought one.

https://www.cambriabike.com/shopexd.a...Bottom+Bracket

bikinfool

Me too! Thanks for the tip...