How much do you want to spend? Little to nothing $ - use an old derailleur and lock it out to the intended chainline Find a magic gear, you may need a half link. This is always the best option, but as the chain stretches, theres no way to tension. But if you play with a few gear combos, you might find one that works. Cheap ones are $20-50 and all will have some mixed reviews. Surly Singulator, DMR tensioner, cheap ones from Performance.... these will all hang from the hanger and push up or down to tension the chain. Will need to be adjusted as chain stetches. If you use one of these, it is far better for the tensioner to push UP, towards the chainstay, so that you get way more wrap around the cog. Same price point, but ive had better luck with, blackspire stinger. You can mount to iscg tabs (if you have them on your frame and buy the iscg mount) or in place of a bb spacer. This you can push UP towards the frame, but from just around the crank, and again get great chain wrap. This would be my suggestion for the budget go to, i ran one for several years without issue. Expensive ones should work far better, i just picked up a Trickstuff EBB for standard threaded bb's, or there are some fancy Rohloff tensioners that work well. Price range $80-160 The rohloff is similar to the singulator in basic concept, but with a MUCH better spring (people tend to break the spring often in the surly, and it is pretty weak). Looks more like a derailleur, but intended and designed only for SS use. The trickstuff BB is one of only two EBBs that I know of that work on standard threaded bb's. Not cheap, but a friend has used one with good success so Im gonna give it a shot, since it is much cleaner than running a tensioner. This all assumes you have a standard, threaded BB. If you have a bike that takes a BB30 crank/bb, then drop everything and get an EBB. There are tons of them out there (niner i think makes some, wheels manufacturing, problem solvers i think? And im sure more). Does that help?
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