Steps 4. Time Required 10 - 15 minutes. Sections 1. Flags 0. Introduction A loose pedal can be dangerous for bicycle riders. Allen Wrench Not for sale. Add a comment. Add Comment Cancel. Step 2. Step 3. Step 4. One comment.
Ran into virtually the identical situation today, working on a donated bike. To do the job properly you need a crank puller, a "spanner" for the lockring, and a Park HCW wrench for the "slotted" bottom bracket cup. There are ways to do it without those special tools, but you risk mucking up the threads, etc.
And you probably need a new set of bearings they're likely in "cages". Looks to me like it is an american to square taper conversion BB, they look like this out of the frame if that is indeed what it is. If that is correct it may just need tightening, also if the BB shell hasn't been damaged you can just get replacement bearings from you LBS if just the bearings are bad.
Either option is relatively inexpensive. Tool wise if it is this style of BB you should be able to dissemble it with basic home tools for the most part, spanner wrench, allen wrenches, etc but it will more than likely require a crank puller to remove the arms from the axle. YouTube will be your best friend for this sort of repair, its pretty basic but any bottom bracket work can turn into a pain if you haven't done it before.
You can google American to square taper bottom bracket installation and i'm sure you will find a plethora of information regarding the repair. Although your best option would probably be to take it to a shop. Should be a reasonably easy repair for them unless anything else has been damaged by the loose part. Anyone that knows more feel free to correct me if I'm wrong, but that's what it appears to be to me at first glance.
In case this is of any use to anyone, I've a BTwin Rockrider which had the same symptoms right pedal tilted downwards approx 2mm and left pedal tilted upwards approx 2mm simultaneously and vice versa when bike being pedalled.
It was almost imperceptible when new but steadily got more and more noticeable until it was really doing my head in. I bought a cheap Silverline bottom bracket tool with 20 splines and a 32mm socket, took the left pedal allen bolt out with an allen key anti-clockwise , removed the pedal with a bit of leverage near the crank from a big screwdriver, tapped the bottom bracket tool into the splines it was quite a tight fit and tightened the bottom bracket clockwise until it was tight but not very tight I don't have a torque wrench.
Sign up to join this community. The best answers are voted up and rise to the top. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Learn more. Bicycle crank is wobbly Ask Question. Asked 5 years, 6 months ago. Active 3 years, 2 months ago. Viewed 39k times. How do I fix it? Or they can loosen over time. The crank can become damaged if you pedal while it is loose.
This only makes the pedals more loose and likely to come off. It is easy for crank threads to become worn because they are made from soft aluminum while pearls are hardened steel.
If the threads are worn, tightening will not fix the issue. You will need to get to a bike shop where they can drill out the threads. They will put in slightly larger ones and insert a helicoil that will allow the pedal to fit again properly. The bottom bracket on a bicycle can also influence the pedal. This bracket connects the crankset to the bicycle and allows it to rotate smoothly. There is a spindle within the bracket that attaches to the crankset and bearings that let the cranks rotate.
Pedals attach to these cranks. Bottom brackets can become loose over time and when they are not securely locked in place, the crank and pedal will wobble.
Improper tightening can cause the locking threads in poor condition and if damaged they will not secure the bottom bracket.
Alternatively, an accident or damage to the bike can cause bearing to become loose within the bottom bracket. This interferes with spindle rotation and pedal stability. A loose or broken bottom bracket will sound like a rhythmic creaking as you ride along.
If the locking threads are not damaged, you wimpy need to tighten the bottom bracket cup to secure the pedal. First, you need to loosen the lock ring, then tighten the bottom bracket cup until the crank is moving smoothly. Holding on to the bottom bracket cup, tighten the lock ring. The chainring is another potential cause of a wobbling pedal. The chainring impacts your bikes gearing and is directly attached to the cranks which have the pedals attached.
With regular riding, the bolts that hold the chainring securely in place can become loose. In some cases, they fall out. Early signs of this will be a wobbling pedal, but if not caught in time, you will hear a big crunch mid-ride and the bike will just stop. If you notice that you have pedals that wobble, check the bolts of the chainring to make sure they have not come loose.
A loosened chainring will move as you pedal which will only further loosen the bolts. If the chainring moves as you pedal, the pedals will shake or wobble too as they are connected through the crank arm.
One loose component of this system will impact the others.
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