For maximum aerodynamic efficiency on your wheels we recommend that the width of the tire does not exceed the outer width of the rim. Our AIR + PLUS rims are very wide with 27 to 30mm, opening the tire enough so that the tire and rim walls form a seamless line.
Clincher or tubular tires from 23mm up to 28mm are perfectly integrated into our AIR + PLUS rims.
As a reference we have tested the air resistance of the APRIME in the wind tunnel with
a speed of 45km/h with different tires.
23mm tire = air resistance by 45Km/h = 10,7 WATT
25mm tire = air resistance by 45Km/h = 12,1 WATT
28mm tire = air resistance by 45Km/h = 13,6 WATT
(we measured 16,8 Watt using regular aero wheels with 24mm rims and 25mm tires)
more information: click here