that would be approximately 4 places in some time trials I have done recently.

also your math is wrong.

calculate the rollout of the wheel per revolution * gear ratio * 100 (rpm) * minutes in a time trial

I got the following for a 30 minute time trial in 53/15 at 100rpm

at 2095mm = 13.798 miles
at 2110mm = 13.899 miles

approximately 528 feet difference at the line (pretty far at the end of a time trial.)