Re: Should I use this?
A great deal depends on the kind of frame you have and the size of your drive sprocket. If you can run your drive chain to your drive sprocket with tension above and below - AND it doesn't rub on a chainstay, or even come near one - then don't put a "tensioner" on at all. Adjust the length of your drive chain so you can slide the rear wheel back to put tension to it. Then use the chain guide/tensioner on the pedal side if you need to. I think that's the best way, if you can pull it off.
"There is nothing wrong with wanting a motorbike that is an extension of your personal taste and fashion sense; if you must ride somewhere, I say do it with style