My rear gear feels like it's slipping, not sure why it's happening

Hi,

I bought a new bike with a flip-flop hub around Easter, and only switched to fixed last weekend.

Over the week, I've had the following issue which has been getting more and more noticeable.

When I break quite hard using the pedals it feels like something slips and the wheel rotates a bit without the pedals, then it locks back in. When I pedal hard again (rather than just crusing along) it does the opposite, something seems to slip in the other direction, and my pedals suddenly rotate forward a bit without the wheels before it locks in again.

It only does them alternately, so it will only slip forward once it's slipped back etc.

At first I thought I was just doing little skids and then having wheelspin in the other direction, that's what it felt like to me, but I've had a look and the wheel is just rotating as normal, no skidding.

It doesn't slip much, maybe just a 1/16 of a rotation, but enough to notice it.

Any ideas what it might be, and how I can fix it? Is something not locked in properly? Will this damage my gears/chain/hub? As I'm new to fixed I don't entirely understand how it all works with lockrings etc.

I'm sure it's not my chain slipping as they are almost brand new gears and chains.

Thanks to anyone who can help

undo the lock-ring, fully tighten cog, then tighten the granny out of the lock-ring

What Murtle said. Sounds like your lockring isn't tight enough.

wrong, loosen the lockring a bit, ride up a hill, then tighten the lockring, but dn't overtighten it, otherwise you'll just strip the threads.

dot

wrong, loosen the lockring a bit, ride up a hill, then tighten the lockring, but dn't overtighten it, otherwise you'll just strip the threads.

I once broke a lockring by overtightening it (without stripping the threads on a shite system ex hub).

To the OP - make sure the cog and lockring are tight before you ride again. Otherwise you'll fuck up at least the hub and lockring, possibly also the cog and yourself.

Thanks for the replies.

reeen had a look at it, and confirmed it was the lockring, then I took it to the shop where I bought it, and the guy tightened it for me. Hopefully the threads didn't take any damage.