Yes, 1667 is correct if you're in kph mode.

If mounting on the crank is inconvenient, if you stay in the same gear all the time, you could put it on the rear tire (or front I guess if you have a trainer that turns the front wheel) - and include the sprocket-chainring ratio in the calculations (you can do this at the end - if you run, say, 38 teeth in the front and 18 in the back, instead of 1667 use 1667/(38/18) = 789mm circumference.