Threaded hub or not?

I was riding home this evening and all of a sudden my sprocket slipped as I peddled forward. I didn't have a lockring tool so I tried locking it up tight again by back peddling whilst still.. if you see what I mean.

Anyway, I rode off but it happened again and again until eventually I could continuously peddle forward. I thought that was it; I'd threaded the hub. But when I peddle backwards (unscrewed the sprocket) against the lockring it locks tight.

Have I threaded the hub or do you reckon it can be sorted out? I don't have a lockring tool right now so I can't get it off to check the damage.

I was wondering, if I've threaded the spoke side of the sprocket thread (and not the lockring side) then is there some kind of spacer I can put on the spoke side?

What make are your hubs? What size rear sprocket are you running?

It is a Iro hub and a 20t 1/8 sprocket.

I think you put your sprocket on backwards. If you're going forward it should tighten.

Larger sprockets apply a lot of torque, so it may not be good news.

I think you put your sprocket on backwards. If you're going forward it should tighten.

??

Larger sprockets apply a lot of torque, so it may not be good news.

I thought as much. Pants.

I'm lucky that the hub is a flipflop with two track sides. I've just got to get a lockring tool.

show us a pic.
it should tighten when you're pedaling forward.
also, i've got a lockring tool and chain whip if you wanna use them.

im reading this from my phone, so am being lazy in reading i guess. anyway. if you can pedal forward without it tightening, it is most probably fucked.

show us a pic.
it should tighten when you're pedaling forward.
also, i've got a lockring tool and chain whip if you wanna use them.

Cheers, but I live in Southampton. Gonna shoot over to a shop and pick one up this afternoon. Thanks though.

I'll hopefully get it off tonight and see what the damage is.

Sounds to me that the lockring isn't tight enough, and the sprocket is undoing and tightening in the tiny gap that exists between sprocket and lockring.

Tighten the sprocket down (go up a fucking big hill, stamp on your pedals while facing a wall, or rotafix it), then tighten down the lockring with a proper tool.

As I peddle forward it doesn't tighten at all, just continuously turns. It only locks when peddling backwards.

That's why I'm thinking there's thread on the lockring side (not the spoke side) of the sprocket thread. Perhaps if I put some kind of spacer on the spoke side I could use the remaining thread that is on the lockring side of the sprocket thread. What do you people think?

As I peddle forward it doesn't tighten at all, just continuously turns. It only locks when peddling backwards.

That's why I'm thinking there's thread on the lockring side (not the spoke side) of the sprocket thread. Perhaps if I put some kind of spacer on the spoke side I could use the remaining thread that is on the lockring side of the sprocket thread. What do you people think?

The thread on that side goes the wrong way.

Just give up on this side of the hub..

Just give up on this side of the hub..

You're right. Sorry to be annoying. It just confused me tightening one way but not the other.

Where are you based? If you're near SE1 I could have a look at it for you tomorrow.

Thanks Sharkstar but I live in Southampton.

That's a long way to ride with a threaded hub.

if you can peddle forward with no sign of tightening, it can only be fucked..(threaded). But then again, you're trying to tighten it by back peddling, which is actual undoing the sprocket. I imagine if your lock ring is loose (becuase you don't realise it has a reverse thread?) you could get the sprocket loose enough for there to be a few spins of the cranks before you experience tighening (but not many). So how much forward spinning are you getting? indefinate?

erm, he's stripped the threads, not threaded the hub, people.

To avoid doing same to other side you may want to triple check the cog and hub threading pitches.

Some useful reminders about probs of mixing hub and cog threads @ Phil Wood

erm, he's stripped the threads, not threaded the hub, people.

Thanks for clearing that up. People might have thought he'd threaded the hub or something.

I imagine if your lock ring is loose (becuase you don't realise it has a reverse thread?)

NO, don't be silly. If that was the case I would be too stupid to realise how a fixed gear bike worked.

The problem is: The sprocket is, or was, too narrow for the amount iof thread that is availble for the sprocket.

hokey coke, so is it knackered or do you need a spacer?
an old bottom bracket lockring would work i think...

ok, so it sounds like you've stripped the thread for the sprocket, and now the only thing holding it on is the lockring. when you backpedal, the lockring tightens and the friction between the sprocket and lockring is the only thing holding it on.

i'd follow prav's advice and just give up on that side...