Find your ideal triathlon or time trial bike frame size. Tri bikes use unique geometry with steep seat tube angles and aerodynamic positioning that requires different sizing than road bikes.
Triathlon bike sizing is fundamentally different from road bike sizing. While both use centimeter frame measurements, triathlon and TT bikes feature steeper seat tube angles (76-80° vs 72-74° on road bikes), shorter top tubes, and aerobar extensions that create a completely different riding position. Most riders need a frame 1-2cm smaller than their road bike size.
The aero position on a tri bike prioritizes reducing frontal area while preserving hip angle for efficient pedaling and a strong run off the bike. Stack and reach measurements are more important than traditional frame size, as the aerobar pad position is built around these reference points. Our calculator accounts for your full body measurements to recommend optimal frame geometry.
| Rider Height | Frame Size | Target Stack | Target Reach |
|---|---|---|---|
| 5'0"-5'3" (152-160 cm) | 46-48 cm | 480-510 mm | 360-375 mm |
| 5'3"-5'6" (160-168 cm) | 48-51 cm | 500-530 mm | 370-385 mm |
| 5'6"-5'9" (168-175 cm) | 51-54 cm | 520-555 mm | 380-395 mm |
| 5'9"-6'0" (175-183 cm) | 54-56 cm | 545-580 mm | 390-405 mm |
| 6'0"-6'3" (183-191 cm) | 56-58 cm | 575-610 mm | 400-415 mm |
| 6'3"+ (191+ cm) | 58-61 cm | 600-640 mm | 410-425 mm |
Shorter races where power output is maximized.
Long-distance events prioritizing sustainability.
Find your ideal road bike frame size for training rides
Optimize your saddle position for power and comfort
Compare geometry across different bike frames
Optimize your reach and handlebar position
Find the optimal crank arm length for your leg length
Measure from the ground to your crotch while standing against a wall.
Sit on a hard chair with back straight — measure from seat to top of head.
Measure from shoulder tip to wrist crease with arm extended.
Enter your measurements and race distance to get a personalized triathlon bike size recommendation