Hello

A friend of mine has this ss bike, a trek soho :

http://www.kapteintweewielers.nl/images/uploads/Trek_Soho_S.jpg

The chain has begun to fall of, and she hates to get black fingers…
it has horizontal dropouts, facing backwards.

I know i can mount some chaintugs, but i wonder if i en anyway can mount a spring assisted chaintensioner ?

Or should i weld on a geardrop-out, and mount a chaintensioner ?

chain tugs would be the best start, Surly for the fashion concious or i think DMR

Sorry if I'm being dim but if it's got horizontal dropouts why the heck do you need a tensioner? It appears to be a singlespeed / hub gear specific frame. You should just be able to tension the chain by moving the wheel back!

If the chain is falling off a lot it suggests that either the chainline is out or the wheel isn't clamped tightly enough – you could either go for a nutted axle rather than QR, or get a chaintug which will fit onto the open end of the dropout. On One used to do them, or just do a quick search on ebay.

Alternatively just do up the QR really, really tight!

What SprocketJockey said. The picture linky shows the rear axle is nutted, not QR, so a chaintug may not be necessary.