How to Measure Reach on a Mountain Bike: Tips and Techniques for Proper Sizing
To measure reach on a mountain bike, first, place the bicycle on a level surface and put a straight edge/level across the center of the bottom bracket. Next, measure the horizontal distance from the straight edge to the center of the top of the head tube. This measurement is the reach of the bike. Alternatively, one can refer to the bike’s manufacturer website or manual for the reach measurement.