The fulcrum light xlr tubular road wheelset was born to climb mountains and win uphill no wheel is lighter or more agile designed to confront the toughest ascents and power through every bend the full carbon rim responds promptly to every pedal stroke and the hubs with cult ceramic bearings assure the maximum smoothness unaltered over time fulcrum 21 spoke ratio on rear wheel double the number of spokes on the drive side for greater wheel stability and improved power transfer in the rear