I recently completed the conversion of a mountain bike to single speed, using a Surly Fixxer, a freewheel, and a Salsa chainring on a road crank.

I was dismayed to find that with the gear I was using, the chain, while not ridiculously loose, was a bit sloppy, but with two links removed from the chain, it barely fits in the dropout.

Now, you can't really see the chain sagging, but you can flop it up and down with your finger and it feels loose. I have ridden it, though, and it doesn't who any signs of slippage.

I am considering putting a halflink in it.

What do you guys think?