- 3-athlon.com
 - Online triathlon store for gear, clothing, bikes, and more. - All3Sports.com
- Offers triathlon wetsuits, bikes, clothing, and gear.
- Aquaman Triathlon
- Makers of the Aquaman wetsuits and other swimming apparel and accessories.
- Austin Tricyclist, Inc.
- For triathletes and duathletes. We sell everything for the demanding athlete including road bikes, running gear, wetsuits, and nutritional supplements.
- Bicycle Sports
- Includes technical information on positioning and speed in bicycling.
- Dave Scott Inc.
- Coaching services, camps, products, training programs.
- DogHead Design
- Triathlon gear including swimming, running, biking, and racing apparel. Also offers gel-flasks, packs, clipons, and bike holders.
- Endurance Plus Sports Mall
- Shopping, training and cool stuff for extreme and endurance athletes.
- Extreme Performance Gear and Training
- Online shop providing apparel, bike frames, and nutritional products to triathletes, road cyclists, and mountain bikers.
- Final Kick Sports
- Specializing in triathlon equipment including running gear, bikes, swim gear, and a full line of triatlon accessories.
- Fit2Race
- Offers triathlon wetsuits, swim goggles, and endurance sport clothing.
- Ironman Store
- Features swimming, running, and biking gear.
- Jeff Devlin Coaching
- Personalized coaching for athletes from beginner to elite.
- Keith's Triathlon Shop
- For running, cycling, swimming and triathlon needs.
- Michael McCormack
- Running, cycling, and multisport coaching for athletes of all ability levels.
- MultiSport School of Champions
- Instructional services aimed at Multisport athletes of all ages, backgrounds, and levels of ability. Founded by Paula Newby-Fraser, John Howard, and John Duke.
- Pactimo
- Sells custom sports apparel including custom jerseys, shorts, outerwear, and accessories for cycling, triathlon, and running.
- Rick Niles Multi Sport Fitness
- Coaching for triathletes; training camps, performance packages and coaching software.
- SBR Multisports Triathlon Shop
- One stop shopping for equipment, apparel, rentals, and hard-to-find necessities for triathletes.
- SportVelo
- Individual coaching combined with premier cycling services.
- Tailwind Triathlon Training
- Includes registration, schedule, and maps of this triathlon clinic.
- Transition Sports
- Sells triathalon gear, apparel, equipment, and accessories.
- TRI Outfitter
- Provides brand name triathlon apparel, equipment, and supplies.
- Tri-eCoach Multisport Coaching
- Offers coaching services for triathletes and duathletes of all ages and abilities.
- Tri-Zone
- Racing and training equipment for triathletes.
- Triathlete Sports
- Triathlon store offering clothing and gear online for both training and racing in swimming, cycling, and running.
- Triathlonbag.com
- Offers the DT Multisport Triathlon bag for general gear, swimming, and airplane carry on use.
- Triple Your Endurance
- By Vince Palko. Offers a fitness and stamina building program on CD.
- TriSports.com
- Specializing in the equipment, apparel, and hard-to-find necessities that every triathlete needs.
- TriVillage.com
- TriVillage offers online sale of triathlon gear and apparel.
- USA Sports Training
- Specializes in triathlon training products and information. USA Sports Training sells triathlon training equipment and gear, books, DVDs, and more.
- Vie Active, Inc.
- Offers apparel for multi-sport athletes and specializes in triathlon and cycling clothing.
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