I am working on a single speed conversion on my old trash picked bike. The derailur(sp?) didn't "come with the bike" so I was wondering what I could do with it. I took everything off except the breaks and decided to make it a single speed. I took a good amount of chain links off and it is in between gears. It is on the large cog in the front but on the back when I put it on one gear the chain is too big and falls off but when I move it to one gear bigger the chain is too small and doesn't allow the wheel to sit all the way in. I was wondering if they made such a thing as a half chain link.

they make a such thing as a half link. i dunno about a half link chain

Yes they make half link chains, check out the Interlock made by Shadow Conspiracy and I belive that KHE also makes one

Thanks guys. Do you think that will solve my problem?

I would try to get a derailer to use as a tensioner probably the cheapest way & a good way to see what gear you like. Use a cable to hold it in position so it won’t derail the chain. There is no shortage of info on this, so if this doesn’t help look around.

I've always wondered what the point of that was...besides looking cool.

Those are mainly used on bmx with tiny gearing, and they are very strong

You only actually need one half-link. I went to the local BMX shop to buy a link or two and they just gave me a couple from a chain they had shortened. You might want to try that route.

Alright, will do. I will head up there later today.

I ran a KMC Pintle half-link chain...it was crazy-noisy. It was the tits when it comes to style though.

There's also a brand called Reluctant that makes that exactly same half-link chain, as pictured above. I can confirm that it looks good (ahem! yeah, I have in on my Raleigh-conversion) and it is supposed to be super-strong too. I bought it from some Ebay-seller.

However, when still new it seems to stretch quite a bit. I actually had to cut two more links off after riding with it for couple of weeks. But probably the larger number of chain links causes proportionally more stretching of a new chain, I guess. And it's not noisy at all, at least on my set-up.

just a question about these half-link full-length chains...
they'll definately work on a regular road bike right? like, i'm not looking for anything specific am i? say, if i just buy one that is normally installed on a bmx bike, it'll also fit on my fixie...?

If you're still using the multispeed freewheel then you need a 3/32" width chain. I think full half-link chains are only available as 1/8" width. However, individual half-links for 3/32" are available but not as common. If you go to a specialty BMX shop, they may not have 3/32", check before you buy.