i put an SR Ovaltech 38 tooth chain ring on the front crank of my SS converted Hardrock. I'm not running a tensioner because i found a magic gear ratio that gave me good chain tension without it (38x15). i've found that with the oval shape of the front chain ring the tension of the chain changes because if the change in the diameter of the spinning chain ring. it produces a clicking noise at low rpm because the chain is gpoing slack and then tightening really quick and a grinding noise at high rpm and if i'm really torquing on the pedals because the chain ring is trying to stretch the chain apart. i imagine with a lower chain tension and a tensioner it will probably work fine. just letting everyone know what my findings were. i possibly might be running too high of chain tension as well so a little experimentation is advised. i found that running a round front ring gives me more flexibility in chain ring sizes i can use and is easier to set up and possibly find a "magic" ratio so you don't need the tensioner.