Overhaul A Bike’s Cup And Cone Bottom Bracket
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- čas přidán 8. 10. 2014
- There are many steps to overhauling a cup and cone bottom bracket, so make sure you leave plenty of time. Unlike modern, sealed type bottom brackets, cup and cone bottom brackets can be regularly serviced, and If you're careful, will last a very long time.
This is a long guide, so you can choose to either watch the entire video above, or follow it in smaller chunks by clicking on the individual steps below.
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Steps to Overhaul A Bike’s Cup And Cone Bottom Bracket:
00:06 Remove A Bike's Square Tapered Crank
The commonest type of cranks are aluminium, with square holes that fit onto a tapered square section axle. A nut or a bolt pulls the crank onto the taper to jam it on. They usually need a special tool called a crank-puller or crank-extractor to pull them off the axle.
03:32 Service A Bike's Cup and Cone Bottom
Some bottom brackets can be serviced. Others are fit-and-forget, when they wear out the whole unit must be replaced. Some have cartridge bearings that can be replaced. Identify an serviceable bearing by the lock-ring on the left-side cup
11:50 Adjust A Bike's Cup And Cone Bottom
Some bottom brackets can be adjusted to tighten or loosen the bearing. Others are fit-and-forget, when they wear out the whole unit must be replaced. Some have cartridge bearings that can be replaced. Identify an adjustable bearing by the lock-ring on the left-side cup
16:27 Check The Cranks On A Bike
Modern bikes usually have cranks made of aluminium, they are mounted on an axle made of harder material, usually steel. If there's any play between the cranks and the crank axle the soft aluminium will soon get worn to the point where it's impossible to lock the cranks. If the cranks are loose don't ride the bike.
16:49 Check A Bike's Bottom Bracket
The bottom bracket or crank-axle is the bearing on which the cranks turn.
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Thanks for the help!
Thank you! this video was VERY helpful!
An excellent tutorial--the presenter's voice was very clear, instructions brief but comprehensive, camera shots excellent, thank you.
i guess I'm kinda off topic but do anyone know of a good place to watch new movies online?
Definitely, have been using Flixportal for months myself :)
Thanks so much! I wanted to take the old slightly crunchy BB out and replace it with a sealed one, but the fixed cup had other ideas (and I have no vise).. This video gave me the confidence to replace the bearings without removing the fixed cup, now the bike is back up and running smoothly :). Maybe next year I will bring it to a shop to see if they can remove the fixed cup, but for now all good and maybe I'll service it this way for years to come to make use of the peg spanner I bought just for the lock ring.
I stripped my crank arm nice and clean.
Wish I would have seen this before working on my bike.
Awesome!
If the spindle has any pits, Will you always need to replace it? can you get away with using the same spindle with pits? Should you replace the ball bearings, even if they look okay?
isn't there a danger that if you only use 1 spanner when pulling the chainring from the axle that you will sheer the threads on the inside of the chainring ? I usually use a second spanner to prevent this.
hi!
how tight should the fixed cup be? is tapping the spanner with the hammer overdoing it?
thank you
Yes I think that hitting it with a hammer would be overdoing it. The act of pedalling tightens the cups over time, and in most cases become very difficult to remove. Make sure it's nice and tight with just your hands and a spanner and it will be fine.
This is a great video and thanks for posting it - just 1 question - is it ok to use vaseline instead of grease? Last time I used butter, but that was not very good and started to make grinding noises after less than a month - upon inspection found balls to have gone rusty :-(
vaseline (petroleum jelly) or butter are terrible options for bottom bracket lubrication. You can get a tube of general purpose automotive grease for just a couple of bucks, or a bike specific grease also for very cheap. like 5 USD.
ok, thank you very much for the advice - I have borrowed a bit of marine grease that my sister uses on her outboard - guess that should stop the rust problem
Greenjuiceman Marine grease is a great option! Good luck, man!
If you wanna work on your bike I suggested watching vídeos from "RJ the bike guy" he explains everything on how to clean and regrease
Thanks for an excellent tutorial how to change the bearing.
Good video but way to much grease is used in the cups.
It looks like this lock ring tool would slip if no another hand to secure it.
What is your name grease?
😮😮😮👍👍