Allow me to introduce you to the Surly Tuggnut.
Designed primarily for single speed / fixed gear bikes, the whole point of the Tuggnut is to incrementally move the rear wheel back in horizontal ‘dropouts’ to achieve the all important correct chain tension without the need for an ugly derailleur or external chain device or some kind. With 2 separate axle mounting points and uber fine adjustment available from the little thumbscrew, finding the right position for your rear wheel is a snap. And, thanks to a neat little washer type attachment, you can also run quick release wheels just as easily as solid axles.
I fitted one to my Surly Troll because I was having some interference issues with the wide tyres and the front derailleur cage; happily I only needed to move the wheel back about 10mm.
So yes, the Surly Tuggnut works extremely well. And the quirk factor? Well, that’s brought to you by the fact it also doubles as a bottle opener! Yep, at the end of a long, hard day’s trolling about, you can even crack open a cold one at the side of the trail.