I broke my try-all 17t freewheel in 4 ridings with no dents or bad use, only riding; so i don't recomend it.
Then I bought a monty freewheel (18 t) and I had enough tyre clearence. then, I bought a Kenda Nevegal 2.5 and I had >1 mm of tyre clearence
Forgot to say I ride a 14 T rear cog
Hope it helps