pinpoint

I can hear a random clicking sound when pressing the pedals hard. Most noticeable uphill. I`m narrowed the problem down to where the chain leaves the cassette, it seems like the chain is slightly slipping here, and as harder I press the pedal - the harder the clicking sound appear. It can happen several times when pedaling one round.
Do anyone know what I can do about it?

trailangel

Narrow it down some more for us. How many miles on your chain?? How many miles on cassette?? How many speeds??
Are you crosschaining?? There is no "slightly slipping" of a chain engaging a cassette.... it either slips or it doesn't slip.
What gear is it in when doing this??

pinpoint

It is new, I have used it for no more than 100km. No cross chaining. The problem appears most often using the middle part of the cassette.
When I turn the pedals with force in the same gear (the bike upside down), I can see that the chain slips randomly. With little force it doesn`t slip.

pinpoint

I think it may be a freehub problem. When spinning the wheel I can see the cassette is moving slightly outwars and inwards during each turn.

trailangel

Maybe just ride it to break in the freehub....might be a bit tight or old grease.
Lube the chain.
And don't turn the bike upside down.

Iride01 

New bike....bought from a LBS (local bike shop). Let them look at it, but it might just be normal wearing in. My new bike is noisier in the rear, but as I've gotten over 130 miles on it now, it seems to be getting quieter. Lubing your chain, though it probably doesn't need lube, might deaden some of the sounds. But then you may have to deal with a gunky chain sooner and that seems to drive some people nuts.

Some hubs and free hubs and their cassettes will amplify normal sounds and you'll perceive otherwise normal sounds as bad simply because they are louder.

Iride01 

Probably normal. We all have seen that. These things weren't made with precision for space flight.

But we can't see what you are talking about either. But they do have a wobble normally.

pinpoint

Ok thanks. I think I`ll ride it more to see if it disappears. Currently, I`m riding the bike in -10 degrees celsius, maybe that`s part of the issue.

Iride01 

That's an option, but remember, if this is a new bike and you bought it from a bike shop locally, then simply take it to them and let them see it. Overwhelmingly these things are probably nothing. But you could be the exception. If you bought it online or elsewhere, most bike shops won't care and will still give you an experienced eye to tell you for certain.

-10.... brrr.... my days of liking cold weather are well behind me.

trailangel

No kidding