Surface Condition     (Learn More) (Surface Guide) ---Select Surface Condition--- Track (Indoor Wood) Track (Outdoor Concrete) New Pavement Worn Pavement / Some Cracks Category 1 Gravel Poor Pavement / Chipseal Category 2 Gravel Cobblestone Category 3 Gravel Category 4 Gravel Measured Tire Width (Not the number on the sidewall)     (Measuring Guide) ---Select Measured Tire Width--- Wheel Diameter ---Select Wheel Diameter--- 700C/29" 650C 650B/27.5" 26" Average Speed ---Select Average Speed--- Recreational Fast Single Track Moderate Group Ride Fast Group Ride Cat. 1 / Cat. 2 / Cat. 3 Racing Pro Tour Weight Distribution (Front % / Rear %) ---Select Weight Distribution--- 50/50 (Triathlon/TT/Track Bikes) 48/52 (Road Bikes) 47/53 (Gravel Bikes) 46.5/53.5 (Mountain Bikes)