Wind tunnel testing at the Texas A&M facility has proved the disc to be the most aerodynamically efficient of all the HED wheels. This has also been corroborated by independent tests at Bath University England, which confirmed the advantages and benefits that a lenticular disc has over flat discs. The lenticular shape smoothes the disturbed air produced by the rider and crosswinds, so airflow leaving the wheel surface is less turbulent than on a flat disc or wire spoked wheel. A reduction in turbulence is an increase in speed.

The HED disc is available in both clincher and tubular, rear only, 700c and 650c. Shimano compatible cassette. Weight limit 200lbs.
 
Note: Available with a Shimano hub only.

Specifications

Weights	700c	650c
Rear Tubular	1350g	1273g
Rear Clincher	1420g	1355g

Please note: weights listed are actual weights of instock wheels, not claimed weights.

Wind Drag In grams, measured at: Density .0023755(slug/ft3) temp 61 f, 19mm tire
Wind Angle	0°	5°	10°	15°	20°
Std Disc	189	156	102	53	34
28 Spoke std.	221	229	273	283	292