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@Ramsaye
Typical TNRC gearing is 65gi so at 90rpm we will be doing 17.5mph. We don't tend to go much above this on the flats, gears are welcome but don't tear off the front as the speed is the speed for a reason.
Overall ride averages tend to be between 13 and 15 due to hills etc... but if you can maintain 18 on the flat you should be fine.