Singlespeed & Fixed Gear - Need Help: Something is "Slipping" on my newly built Fixed Gear

Hi,
I recently converted my old 12 speed General into a fixed-gear. I did the "real" conversion with new cranks and a set of cheap track wheels with a flip-flop hub. I just road the bike for the first time yesterday and when I go to attempt a skid-stop or am standing to climb large hills something occasionally "slips." It is the weirdest feeling and I am not sure what is causing it. I am almost certain it is not my crank arm on the bottom bracket spindle. I am wondering however if the "slipping" is not caused by my rear wheel moving slightly when the axle is really being pulled hard. Funny though, you think I would notice a difference in the chain tension if this was happening, it does seem that my chain tension is any different though after the "slipping" occurs. Anyway, I don't want to die and this slipping thing makes me feel pretty unsafe.



Any thought??? Thanks for the help, I have searched the forums for some kind of answer but found nothing.

--Norman

Loose lock ring maybe? This will allow the cog to back off slightly when appying back pressure and then tighten up again when you apply forward pressure.

your cog and lockring aren't tightened down enough.

rotafix the cog, then crank down on he lockring. use a tool to do this to get it as tight as possible (logic says buy a lockring tool if you don't already have one. I used a dremel and ground down a pair of groove joint pliers to have some lockring sized buckteeth on the end to grab it)

remember the lockring turns left to tighten (reverse threaded)

Your rear cog/lockring assembly.

The cranks can't really slip since the taper/hole interface is square, your axle is basically bolted to the frame while the hub rotates around it so those two points aren't really options. On FG that leaves only the cog/lockring.

And yes, it can kill you.

Arthur

Edit - Wow I type slowly. No replies when I started!

Thanks a ton for the information. I will checkout that rear cog asap

what makes it a "real" conversion? cause you bought a crank set?

your bar tape has the wrong threading... I mean lockring and cog aren't tight, fix it IMMEDIATELY, hopefully your hub isn't already hosed.

Why would my hub be "hosed?"

He means stripped

Thanks

happened to me too. make sure that thing is super tight.

You may want to check this out before you disassemble your bike. I had the same problem and it turned out that my chain wasn't taut enough. I had just repaired a flat and wasn't super careful when I reinstalled the rear wheel. A simple on the side of the road adjustment and all was well.

stripped hub or loose chain ring either way fix it now or you may be another traffic casualty