Halflink chain vertical drop query

would the use of a halflink chain solve problems of chain tension on vertical drops?

or is an eccentric hub essential?

thanks

It all depends how vertical the drops are. If there's some movement front to back, a half link may be right for you. You'll be lucky to get spot-on chain tension with a half link that lasts forever.

From what I've heard half links are notorious for bending out of shape, stretching, or snagging on gear teeth.

Try it though, it's a very cheap option if you can't find a magic gear with what you've got.

Take a look at http://eehouse.org/fixin/formfmu.php for working out if a half-link will get you the right gear. Also other pages there about chain stretch etc.

they are semi vertical i think as defned by sheldon. a 70/80s brian rourke frame

If they're semi-vertical you may not even need a half-link. It all depends what sort of gearing you want or are willing to put up with. Half-link will double your options though.

Rough guide: Changing either sprocket or chainring by one tooth, moves your axle by 1/8" (approx 3mm). See if you can plug some figures into the tool at tthe link above and check your options.

I've done a bit of playing round with an old MTB and managed to get it single speeded with something like semi-vertical dropouts. The chain is a little slack but has never come off. If you want to set the bike up fixed, i'd be more cautious about a slack chain as you'll be using the drive train for some degree of braking.

yeh im just transfering all my parts from my new fixed wheel to an old racing frame and wondering if it is that easy or if i need new kit.

as long as the chain isnt slack il be fine no?

why are you doing that?

boredom, curiosity, new tools.

ok. have fun...
;)