Securing fixed cog w/o lockring
 

Suppose I have hub with freewheel threads only. If I use red loctite and wrench the cog on really tight, will it be strong enough to resist backpedal braking? If not, what are other options? I probably can't weld steel to aluminum very easily. But maybe I can drill a hole through the cog lip into the hub threads and run a screw in?

Do a search on suicide hub and then do the right thing and get an actual track hub.

You have three options:

1. Rotafix
2. Bottom bracket lock ring
3. Zip tie the cog to the spokes

All of these might result in someone's death; probably yours.

Found this on Sheldon Brown's site:

Suicide Hub A rather alarmist and silly name for a freewheel hub used as a fixed-gear hub. Any standard-thread freewheel type hub will also accept a fixed-gear ("track ") sprocket . This is a common technique for converting an older bike to fixed gear on the cheap. Despite the silly name, this is no more dangerous than using a freewheel, as long as you keep front and rear hand brakes installed.

But it doesn't really provide any information regarding what I requested in my initial post. I'm not buying a track hub. I'll just simply get rid of the bicycle and forget the whole project if nothing else works.

Sounds overly-dramatic.

The bottom bracket lockring may be helpful, though.

got brakes

Have you ever been to a funeral?

You should do a search using the forum search tool for threads with "suicide hub" in the title to get lots of opinions about whether loctite is sufficient etc. But the quote you have from Sheldon ought to be enough. He thinks it is safe ... if you have two brakes. If you have only one brake it is considerably less safe and if you are riding brakeless then it no, the name is not dramatic.

Brakeless "suicide"-hub on this bike for two years:

http://www.pedalroom.com/p/1976-rale...rix-8240_4.jpg

Still alive.

So, answer the OP's question. What are you using? Which color loctite? And really how many miles have you put on that particular bike?

I'm not using any Loctite but I am using a BB lockring - even though some people on this forum swear it's useless.

Not really sure how many miles are on it but it's the bike I ride in the rain, on quick shop errands, when I'm carrying stuff (as pictured) and during the winter. While I do ride it quite a bit, the longest ride I've ever done on it has been about two miles to the beach pictured on roads with very little car traffic.

Once when I was skidding like a maniac in the parking lot across the street from the shop trying to get the cog to loosen up/fail, I snapped the non drive side crank arm instead (it was just a cheapo crank but still). I'd say the cog isn't going anywhere...

I'll probably throw a brake on one of these days.

By the way: I'm not saying everyone should go out and ride a brakeless fixed gear bike equipped with a suicide hub at maximum speed and busting mad skidz in busy downtown traffic. I'm just saying that in my experience, I have had no trouble and most "reports" of how completely unsafe it is are typically made by people who have never done it.

A while back I got the lockring off my bike and after talking with Scrod, spent hours attempting purposefully to force the cog to break free without a wrench and it stayed snug as sin until I gave up and purchased said wrench from Retrogression. I continued to ride without a lockring for 3 days without having it budge in anyway. And I was using an IRD canti on the front for safety; point being, you probably can snug it on their with the right tool and get away with the BB lockring as insurance and be safe as long as you're in control of the bike.

I would never ride brakeless only because with a wife and four kids, my insurance wouldn't pay a dime if they thought I was doing something "dangerous." So I play it safe and always have 1/2 brakes on the Devil.

Don't be such a ninny.

A friend of mine has put thousands of miles on a bike with a track cog on a freewheel hub and I don't think he's using a BB lock ring. He may be using Loctite, but I think he just tightened the cog RFT. If the cog were to come loose it's not like the bike explodes. All of his bikes have at least a front brake, most with two.

Yes, a proper track hub is ideal, but that wasn't the OP's question.

Nice on the mad skidz crank breaking skillz. For some reason I figured the only skid marks I would find around you would be in your boxers.

FWIW I put a cog on a old mtb hub for a snowbeater using red loctite(done proper with clean,de-greased threads and 48 hrs curetime) and was unable to get it off when i didn't like the gearing. Not with a chainwhip,not with the cog in a vise turning the wheel, had to change the chainring instead.

Try heat next time. That's what Loctite says will loosen their red product.

Track hubs are surprisingly affordable.

Yup, and a hub you already have on hand costs nothing.

Which is especially nice when you've only got $8 in the entire bike.

And since all you need to do is swap out the hubs the whole operation is cheap and fast.

Sigh.

You started it.

Ugh, ss/fg is so full of contrarians....

I'm using a fixed cog on a freewheel hub with a BB lockring, no loctite. No problems here after a couple thousand miles on the bike. I used this tool to install: http://www.worldclasscycles.com/shimano_chain_whip.htm It works for both fixed lockrings and BB lockrings, both 3/32 and 1/8 chains. Quite handy.

fixed

Yeah, no contrarians here.

I have used the rotafix method with success (no cog loosenings) for >2 years.

I prefer a track hub when convenient, because it's either no more dangerous, or safer. I rotafix the cog with a lockring anyway to ensure I don't strip the threads of my hub. Maybe the lockring is superfluous in this arrangement.

JB Weld but you still could die

Ziptie it to the spokes.

lol

I have a nice hub that I want to use on my project bike. It's not a track hub but I will have brakes (front and rear) and the trickiest thing I would want to do is trackstand and maybe try to go backward. As hard as the cogs are to remove I too think that I will be fine for the type of riding I expect to do. Which would be to and from work and maybe some knocking about on the weekend with friends.

I haven't done the rotafix method before but it sure is simple and combined with a lockring should hold pretty good.

Tom

I have ridden a FG conversion with a track cog (+ BB lockring) on a freewheel hub for the past four years without issue, despite frequently skidding like a reckless teenager. HOWEVER, I Loctite'd (blue) the s**t out of both the cog and the lockring, and tightened both with my entire body weight on the whip/lockring tool. They aren't going anywhere.

I confirmed this recently in a rather costly way. I went to swap out the 16T cog for a 17T one (to increase my skid patch number), but neither the cog nor the lockring would budge. I eventually got the lockring off with some help from the hammer, but I broke my chain whip trying to remove the cog. I have tried heating it, soaking it with rubbing alcohol, applying lube... still nothing. Going on day three of attempts, it sounds like my best option is to up the heat and keep trying.

So in direct answer to your question, use Loctite and you will be fine. I do, however, always run a front brake "just in case" because I don't want to die on a bike.

Cheers!