current riding a single speed. my gear inches is about 65 right now, it is too low. I am planning to get a new freewheel and that will bring it up to 75. is it still too low? toronto is flat, hills are no problems. should i try in the 85 to 90 gear inches range?
Rans Enduro Sport, Hase Kettweisel Tandem, Merin Bear Valley beater bike
That's a question that only you can answer.
The good news is that single speed freewheels are reasonably priced so making a mistake isn't too costly. I'd go down one tooth from what you have now. If you find that's still too low, buy a new freewneel that's a tooth smaller yet. At some point you'll find that you also have to shorten your chain.