I run 40x16 on my winter brakeless bike and 42x15 on my summer brakeless bike (have not had much experience brakeless with this gearing...) I have to say 40x16 is great for Toronto. There hasn't been a hill I haven't been able to hammer up yet, even when going in and out of the ravines. Can be a little limiting if you like going excessively fast, but I can keep up with traffic without needing a ridiculous spin.