Sprint Cycling 20km: Time Trial (TT) Workout Design

Introduction

The bike leg of a Sprint Triathlon is a 20 km individual time trial (TT)—no drafting, no group riding. For athletes who have just exited the swim and still need to run a 5K afterward, these 20 km must be “steady, fast, and without blowing up.” This article provides an 8-week TT-specific training plan.

Why Use FTP to Set Intensity

FTP (Functional Threshold Power) is the maximum sustainable power output for one hour. A Sprint 20 km takes about 30–35 minutes, theoretically allowing you to push 95–100% of FTP, but to preserve leg strength for the run that follows, 85–92% of FTP is recommended.

If you don’t have a power meter, use heart rate: hold steady at LT heart rate −5 to +5 bpm.

8-Week TT Training Plan Overview

• Weeks 1–2: Build the base, 2×20 min @ 80% FTP
• Weeks 3–4: 3×12 min @ 90% FTP, 4 min recovery between sets
• Weeks 5–6: 4×8 min @ 95% FTP
• Week 7: TT simulation, 20 km all-out
• Week 8: Taper, only 2×8 min at warm-up intensity

Pacing Strategy: Negative Split

Split the 20 km into four 5 km segments:

• 0–5 km: Hold back the urge at 80% FTP; heart rate will keep rising right after exiting the water
• 5–10 km: Settle into cruising at 85% FTP
• 10–15 km: Main push segment at 88% FTP
• 15–20 km: 90–95% FTP, drop back to 80% in the final 1 km to prepare for the transition

Triathlon Bike vs. Road Bike

Given the shorter distance, a road bike can still produce strong results; a triathlon bike offers an advantage of about 30–60 seconds. If budget is limited:

• Add aero bars to a road bike: highest benefit-to-cost ratio
• Choose a TT helmet: next best value
• Pick a one-piece tri suit: reduces T1 change time

Practical Tips

• Do at least one ride per week with no nutrition; Sprint distance usually doesn’t require fueling
• Practice hitting cruising power within 30 seconds of leaving the transition area to avoid a slow start
• Cornering drills: Sprint races are often on loop courses, and smooth cornering is more effective than being 1 km/h faster on the straights
• One week before the race, check the four mechanical items: chain, brakes, shifting, and tires
• If using a triathlon bike, log at least 200 km on the trainer before race day

Conclusion

The 20 km TT is the “make-or-break middle segment” of a Sprint Triathlon. Pace it well, and your legs will still have power for the run; push too hard, and you’ll fall apart in the final 1 km before dismounting. Master the threshold workouts, negative-split pacing, and hitting cruising speed immediately out of transition, and you’ll find your Sprint result isn’t decided by the swim or the run—but by whether you rode those 20 km smartly.

Related Reading

• Sprint Triathlon 5K Run: End-of-Race Pacing and Training Plan
• Olympic-Distance 40 km Bike FTP Training Plan: The Key to Steady Output
• TT Training Plan Design: 4-Week TT-Specific Periodization (FTP → VO2 → Threshold)
• How to Effectively Improve FTP: From Testing to Practical Training Plans