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Bottom Bracket interchangeability

Old 10-13-20, 05:52 PM
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RubeRad
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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
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?
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Old 02-04-21, 08:33 PM
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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.
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Old 02-04-21, 09:18 PM
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...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.
There's a special tool you use to pull the cups that fix the BB unit in place.
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Old 02-04-21, 11:42 PM
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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
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Old 02-05-21, 01:25 AM
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Originally Posted by RubeRad View Post
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
Keep your chain clean and lubed, keep your tires properly inflated and keep your frame decently clean partially to make it look nice and keep dirt of the drivetrain but also to check for scratches or any damage like cracks. Also replace wear items as often as needed.
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