Background on the models behind Ride Planner's estimates, and how to use them to plan an actual ride.
Why a flat average-speed guess falls apart on a hilly route, and how a segment-by-segment power simulation gets closer to a real finish time.
Why humidity matters as much as temperature, how fluid targets scale with heat index, and what an on-bike calorie deficit means for bonking risk.
What "average grade" actually hides, how sustained climbs get flagged and star-rated, and how to use a printed route card at the actual ride.
What separates these event formats -- and multi-day tours -- where the terms come from, and what to actually expect from each.
Why riding in a group changes your effective aerodynamic drag, and how the paceline option accounts for it in the time estimate.
Plain-language definitions for FTP, bonking, gran fondo, CdA, heat index, and other terms used across the site.