Chain tensioner from old derallieur

[Okeydokey]

Got to be possible, anyone got a link to show me the optimum way? I have two old shimano derailleurs, a six speed rear wheel which I use one cogg of. I have a BMX chain which is starting to stretch.

TYVM.

 

[classic33]

Set up something like this! Cable nipple is in the barrel adjuster.

 

[Drago]

Tensioners can be had so cheap it's hardly worth the bother.

 

[TheDoctor]

Even cheaper than "stuff we already have"?
That pic ∆∆ is exactly how it's done.

 

[Drago]

Stick the mech on ebay and buy 2 with the proceeds.

 

[FrankCrank]

.....done it on a cheapo single speed conversion, but sure looks ugly - OK for a pub bike I guess. After a bit more effort (chain half-link and some filing of the dropouts) was able to run without a tensioner - much more pleasing on the eye. This magic gear calculator could also prove useful:

http://eehouse.org/fixin/formfmu.php