The Jet 9 (9 referring to the 90mm depth) are the latest take on Heds well proven alloy clincher rims with a carbon fairing. They were one of the pioneers of the re-adoption of wide rims and for 2011 added ‘SCT’ (stability control technology) to the rim shaping to better control crosswind behaviour.
Tony Martin famously used a Jet 9 front in winning the World Champs Time Trial this year, making that rare decision for a pro cyclist, using a clincher instead of a tubular.
For the numerically inclined Hed have a section on their site that has an interactive graph showing how these wheels compare to others in the Hed range and some of their notable competitors.
Equipped with some fast rolling tyres with width matched to the rim these will be an excellent addition to their new owners Ironman campaign. When I assembled his bike I built the training wheels using wide rims so the Jet 9s will easily slot in for race day duties.