Axel issue

[Carlos the jack daniels]

Noticed a knocking sound on my back wheel thinking it was the axel may be bent but unsure. Is it worth fixing or just order a new hub ? I’ve got an eskute m100( I know) bought just to commute to and from work. Any advice would be appreciated thanks

 

[saneagle]

Noticed a knocking sound on my back wheel thinking it was the axel may be bent but unsure. Is it worth fixing or just order a new hub ? I’ve got an eskute m100( I know) bought just to commute to and from work. Any advice would be appreciated thanks

I very much doubt that it's a bent axle unless you've done something really daft.

Can you give us a better description of the knocking noise? Is it continuous or does it come and go? Is it a deep knocking or a tapping noise or what?

When did it start?
Have you taken off the back wheel, and did it start after that?
What happened to cause it to start or did you just get it out one morning and it was doing it?
How old is the bike and how many miles has it done?

Without giving us all this information, we've got no chance of helping you.

 

[Carlos the jack daniels]

I very much doubt that it's a bent axle unless you've done something really daft.

Can you give us a better description of the knocking noise? Is it continuous or does it come and go? Is it a deep knocking or a tapping noise or what?

When did it start?
Have you taken off the back wheel, and did it start after that?
What happened to cause it to start or did you just get it out one morning and it was doing it?
How old is the bike and how many miles has it done?

Without giving us all this information, we've got no chance of helping you.

It’s a sort of low clunk/ knocking every 1 wheel rotation, it started after I changed my brake pads about 2weeks ago!! The bike is not a year old yet ! It’s done about 700miles just on a road back one for to work(trying to avoid the potholes) is it my hub ? My crank shaft or something else ? It’s my only transportation to work so I’m getting a little worried. Cheers

 

[sjpt]

It could be the wheel out of true, and hitting the brake pads once every revolution.
I wouldn't expect a clink from that; but could maybe be called that.
Very easy to check. Spin the wheel and see if it has a wobble from side to side.
If it does, it needs truing, or has a broken spoke. A bit more difficult but plenty of instructions on the web.

BUT, I see you have disk brakes, so probably not that. A bent brake disc could cause it.

 

[matthewslack]

The online specification says 'mechanical disc brakes', and the noise started when you changed the pads.

Most of this type of brake have one pad fixed and one pad moved by the cable and mechanism. Did you adjust the fixed pad position when you replaced the pads? If not, it may be contacting the disc once per revolution, causing the noise.

Can you get the bike stood up with the rear wheel off the ground and rotate the wheel while you look carefully at it? Check the front as well if you changed those pads too.

A little bit of wobble in the disc is not harmful, and can be put right by carefully bending the disc straight. Only needs finger force.

 

[saneagle]

It’s a sort of low clunk/ knocking every 1 wheel rotation, it started after I changed my brake pads about 2weeks ago!! The bike is not a year old yet ! It’s done about 700miles just on a road back one for to work(trying to avoid the potholes) is it my hub ? My crank shaft or something else ? It’s my only transportation to work so I’m getting a little worried. Cheers

That's pretty easy then. Almost certainly the caliper is rubbing on the motor or the disc is rubbing on the caliper. You need to get your head down by the caliper to see what it is. Once you see what's touching, you should be able to determine what to adjust.

It could also be that the disc is rubbing on the pad, which you can solve by adjusting the caliper:

• First get the caliper straight by loosening the two screws that hold it to the adapter; pull the brake lever on as hard as you can and hold it like that while you retighten the screws
• Screw in the adjuster on the back pad (normally an allen screw that you access from the other side through the spokes) until the pad rubs on the disc when you spin the wheel.
• Back it off until it no longer rubs - no more than necessary.
• Turn the cable adjuster until the moving pad rubs on the disc.
• Back it off until it no longer rubs.
• That's it

One other problem I've seen is the top edge of the disc touches the top of the caliper because the washers aren't thick enough. the difference between hitting and not hitting can be microns. A good indication of that being the problem is when it's worse immediately after you used the brake because the disc expands a bit when it becomes warm.