Some and i note SOME can get away with grinding. However you need to have a fecking spot on position and change the gear ratio. I "bimble" on a 75 cadance. however that is pushing a 55/11 ratio. Only due to his fancy bike fitting has a certain pebble come back and beat my time(show down next seaon folks!)
You will get some grinders list fairy, you get some spinners. get someone to look at your style.