Bottom Bracket interchangeability
10-13-20 | 05:52 PM
#1
Thread Starter
Keepin it Wheel
Joined: Aug 2011
Posts: 10,964
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From: San Diego
Bikes: Surly CrossCheck, Krampus
Bottom Bracket interchangeability
MTB Crank has a persistent thunking click on the left-pedal downstroke, seems like only thing left is the bottom bracket.
This spec says
but BBES300 68x118 in English threading (that's what "BSA" means, right? Not Italian anyways) seem a little hard to find.
Would any English-threaded Octolink V2 68x118 work as well as any other? For instance BB-ES51?
This spec says
SHIMANO CARTRIDGE BOTTOM BRACKET, BB-ES300 SPLINED/HOLLOW-TYPE AXLE BSA 68MM-118
but BBES300 68x118 in English threading (that's what "BSA" means, right? Not Italian anyways) seem a little hard to find.
Would any English-threaded Octolink V2 68x118 work as well as any other? For instance BB-ES51?
02-04-21 | 08:33 PM
#2
Full Member
Joined: Feb 2020
Posts: 371
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From: Boise, Idaho
Bikes: I have a few
Yes, it will work, it may be worth trying to source a better quality used or NOS one IMO. Just be sure the replacement is 118 and Version Two, you could even use 73mm with a drive side spacer if you find one.
02-04-21 | 09:18 PM
#3
Senior Member
Joined: Nov 2010
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From: Sacramento, CA
Bikes: old ones
.
...you should measure the shell width on the bike in front of you with either a metric straight edge or a caliper, to make certain the shell is, indeed 68mm wide. If the crank is Octalink (you can Google a picture if you're not certain), than that's pretty much all you need to know. They are all English standard threading now. Anything will work, but the available alternatives vary widely in quality and construction. I generally spend a little more, and try to get something made with higher QC standards. Note there are 2 versions of Octalink, and the spindle lengths can vary.
There's a special tool you use to pull the cups that fix the BB unit in place.
...you should measure the shell width on the bike in front of you with either a metric straight edge or a caliper, to make certain the shell is, indeed 68mm wide. If the crank is Octalink (you can Google a picture if you're not certain), than that's pretty much all you need to know. They are all English standard threading now. Anything will work, but the available alternatives vary widely in quality and construction. I generally spend a little more, and try to get something made with higher QC standards. Note there are 2 versions of Octalink, and the spindle lengths can vary.
The Octalink system uses a spindle with eight splines. The splines provide a contact area between crank and spindle for an interface. Octalink exists in the marketplace in two variants, Octalink v1, and Octalink v2. The difference between the two can be seen by the depth of mounting grooves on the bottom bracket spindle. V1 spline grooves are 5 mm long, while V2 grooves are 9mm long. Shimano 105, Ultegra 6500 and Dura Ace 7700 cranksets mate to version one bottom brackets, while later mountain bike designs use the deeper-grooved version two. The system is proprietary and protected by Shimano patents and license fees.
02-04-21 | 11:42 PM
#4
Thread Starter
Keepin it Wheel
Joined: Aug 2011
Posts: 10,964
Likes: 5,222
From: San Diego
Bikes: Surly CrossCheck, Krampus
thx guise, but the problem has already been resolved. I should have come back and updated the thread, but since nobody answered in time, I forgot about it.
Replaced the octolink bb and found that the chain needed lubing in a way that it was making more of a click than a squeak. All is good now
Replaced the octolink bb and found that the chain needed lubing in a way that it was making more of a click than a squeak. All is good now
02-05-21 | 01:25 AM
#5
Clark W. Griswold
Joined: Mar 2014
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Bikes: Foundry Chilkoot Ti W/Ultegra Di2, Salsa Timberjack Ti, Cinelli Mash Work RandoCross Fun Time Machine, 1x9 XT Parts Hybrid, Co-Motion Cascadia, Specialized Langster, Phil Wood Apple VeloXS Frame (w/DA 7400), R+M Supercharger2 Rohloff, Habanero Ti 26
thx guise, but the problem has already been resolved. I should have come back and updated the thread, but since nobody answered in time, I forgot about it.
Replaced the octolink bb and found that the chain needed lubing in a way that it was making more of a click than a squeak. All is good now
Replaced the octolink bb and found that the chain needed lubing in a way that it was making more of a click than a squeak. All is good now
