What Are T1 and T2 Transitions in Triathlon?
T1 is the swim-to-bike transition. T2 is the bike-to-run transition. Together they connect the three disciplines of triathlon and represent a "fourth discipline" where races are won and lost. This guide explains exactly what happens in each transition and how to execute them efficiently.
T1 vs T2: What's the Difference?
| Feature | T1 (Swim → Bike) | T2 (Bike → Run) |
|---|---|---|
| What you're doing | Exiting water, removing wetsuit, mounting bike | Racking bike, swapping shoes, starting run |
| Typical time (beginner) | 4–8 minutes | 2–5 minutes |
| Typical time (experienced) | 1–3 minutes | 1–2 minutes |
| Main challenge | Wetsuit removal, going from horizontal to upright | "Dead legs" feeling, adjusting from cycling gait |
| Critical rule | Helmet on before touching your bike | Bike must be racked before removing helmet |
T1 Step-by-Step: Swim to Bike
T1 begins the moment you exit the water and ends when you cross the mount line on your bike. Here's what to do in sequence:
- Exit water and run to transition. Pull your goggles up (not off) and swim cap down. Start jogging immediately — even slow jogging is faster than walking.
- Pull wetsuit to waist. Work it down your torso while running. Grab the zip cord, pull it down your back, then peel both shoulders off.
- Reach your rack. Memorise your rack row and a nearby landmark before the race — rows look identical when you're tired and disoriented.
- Sit and remove wetsuit from legs. Pull the suit down past your hips, sit briefly, and use the heel-push technique: press your heel against the suit's ankle cuff to pull the foot free.
- Put on helmet FIRST. Clip it before you touch your bike — this is a disqualification rule if violated. No exceptions.
- Put on cycling shoes. Or, if you use the flying-mount technique, your shoes are already clipped to your pedals.
- Put on sunglasses and race belt (if used). Some athletes put the race belt on at the rack, others snap it on while running out.
- Grab your bike and run to the mount line. Do not mount before the line — this is another DQ risk.
T1 time tip
Apply Body Glide or cooking spray to your ankles and calves the morning of the race. A wetsuit that sticks for 10 seconds can cost you 30+ seconds of fumbling.
T2 Step-by-Step: Bike to Run
T2 starts at the dismount line and ends when you leave transition on the run. It's typically faster than T1 because there's no wetsuit to deal with, but "dead legs" make the first few minutes of running feel awkward.
- Dismount at the line. Do not cross the dismount line while still on your bike. Practice the dismount in training — swing one leg over the back while still rolling.
- Run your bike to your rack spot. Running shoes should already be there, laid out open (elastic laces help enormously here).
- Rack your bike correctly. It must be fully racked before you remove your helmet.
- Remove helmet. Only after the bike is racked and secured.
- Swap shoes. Sit or stand and swap cycling shoes for running shoes. Elastic laces mean no tying.
- Grab any run gear. Hat, visor, race belt if not already on, sunglasses swap if needed.
- Head to the run exit and go. Take your first 200m slower than goal run pace to let your legs adapt.
About "dead legs"
The heavy, unresponsive feeling when you start running off the bike is normal. Blood pooled in cycling muscles needs to redistribute. It typically passes within 5–10 minutes. Brick training (bike-run workouts) conditions your body to this switch faster.
Transition Rules You Must Know
Violating transition rules results in time penalties or disqualification. These are the most common ones:
- Helmet rule: Helmet must be on and buckled before touching your bike. Must stay on until bike is racked in T2.
- Mount/dismount lines: You must be on foot until the mount line (T1) and must dismount before the dismount line (T2).
- Race number: Must be visible on your front during the run. A race belt clipped at T2 is the easiest solution.
- Transition area: Gear must stay within your designated area. Spreading into another athlete's space can result in a penalty.
- No outside assistance: Family and friends cannot enter transition or hand you gear.
How to Set Up Your Transition Area
Transition setup is done the morning of the race, usually 30–60 minutes before your start. A logical layout speeds up both T1 and T2.
Recommended layout (from front of rack)
- Bike racked by seat (seat on rack hook)
- Helmet on handlebars, open and facing you
- Sunglasses inside helmet
- Cycling shoes below bike (or clipped to pedals)
- Running shoes in front, open with elastic laces
- Race belt looped through running shoe
- Hat/visor on top of running shoes
- Nutrition laid out in order of use
Morning-of checklist
- Pump tyres to correct pressure
- Load bike nutrition
- Set bike computer/Garmin
- Walk to swim exit and count rack rows
- Find a visual landmark for your rack row
- Test clipping into pedals
- Put elastic laces in running shoes
Transitions improve dramatically with practice. Set up a mock transition in your driveway and run through both T1 and T2 at least once before race day — the movements become automatic and you stop losing 2–3 minutes to confusion.
Try a calculator
- Transition Checklist
Step-by-step T1/T2 and kit list.
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