■ Race organizers announced an official headphones sponsor: Thump. Based in Boulder, Colo., Thump specializes in Bluetooth solutions for active lifestyles and eliminating �all the nasty wires that lead to so many tangled nightmares.� It�s offering a 50% special: $55 for a ThumpBlu, a case and a charging cable. Find the details at http://www.qakgear.com/products/thump-case-pack-detroit-fpm-half-off-special?source=nletter-