jonsiot

Hi all, I’ve got a specialized langster and have recently noticed there is a slight wobble on the hub. From what I’ve read this can be normal on the freewheel side?

ive noticed recently I hear a slight slight rubbing noise when I’m pedalling and thought this may be the cause? Or could it be a chain that is too loose?

I can post video if need be

JohnDThompson 

This is quite common and not a concern. It's caused by the freewheel threads not being perfectly coaxial with the hub.

Hard to say. Noises can be difficult to track down. What does it sound like it's rubbing against?

jonsiot

I have noticed from what ive read that the wobbling is quite common...probably just I have never really noticed it before I guess.

In terms of the rubbing noise its not the front wheel, I feel like its coming from the rear wheel but just when I pedal. The noise is like a rubbing/whirring noise. I have since given the chain etc a really good clean, thought perhaps there may have been something on the chain or cassete causing the noise possibly. Will head out for a ride later and see how I go.

Andrew R Stewart 

Just to be sure there are two common noise generating situations with a single speed that can be confused.

One is a too tight chain. As many low cost bikes have less then perfect world machining of parts there's nearly always some variation of chain tension as the bike is pedaled. The correct chain tension at it's tighest point is no tension. Anything more and the tight spots will complain with noise and in time increased BB and hub bearing wear.

Next is a freewheel that sits cocked WRT the hub's rotations. Poor machining of the hub's or freewheels threading and related parts cause this. Most often noticed as a orbital float/wobble of the rear cog when coasting. Unless the off axial wobble is big the issue is minor but adds the attempts at making a drive system run quietly. Revisit chain tension. Andy