Triathlon Bike Size Calculator
Find your optimal triathlon bike fit for maximum aerodynamics and comfort
centimeters (cm)
centimeters (cm)
Frame Size
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Stack
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Reach
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Saddle Height
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Size Guide
- XS: < 165cm
- S: 165-172cm
- M: 173-180cm
- L: 181-188cm
- XL: > 188cm
Aero Position
- Hip angle: 15-20°
- Torso angle: 30-40°
- Arms: 90° at elbows
- Shoulders: relaxed
Fit Tips
- Start conservative
- Build flexibility
- Consider pad stack
- Check reach comfort
Here’s a comprehensive table summarizing all you need to know about triathlon bike sizing:
| Aspect | Details |
|---|---|
| Key Measurements | 1. Height 2. Inseam 3. Stand-over height 4. Saddle height 5. Arm pad stack 6. Arm pad reach |
| How to Measure Inseam | Stand barefoot against a wall with a book between legs at groin. Measure from ground to top of book3. |
| Stand-over Height | Clearance over top tube while standing over bike. Measure inseam wearing cycling shoes3. |
| Saddle Height Calculation | Use Lemond Method: Inseam × 0.833 cm = Distance from bottom bracket center to saddle top3. |
| Arm Pad Stack | Vertical distance from bottom bracket center to back top of arm pad3. |
| Arm Pad Reach | Horizontal distance from bottom bracket center to back of arm pad3. |
| Between Sizes | Consider: 1. Stand-over height 2. Aero bar adjustability 3. Seat-tube length 4. Riding ability 5. Personal preference3 |
| Common Sizing Mistakes | 1. Using generic online calculators 2. Not checking manufacturer-specific geometry tables 3. Relying solely on height and inseam measurements3 |
| Importance of Correct Sizing | 1. Balances power, aerodynamics, comfort, and efficiency 2. Prevents fit-related issues (back problems, knee pain, numb hands) 3. Ensures proper bike handling and performance3 |
| Professional Fitting | Recommended for optimal bike selection and fit13 |
| General Sizing Guide | 4’10” – 5’0″ (148-152 cm): XX-Small (47-48 cm) 5’0″ – 5’3″ (152-160 cm): X-Small (49-50 cm) 5’3″ – 5’6″ (160-168 cm): Small (51-53 cm) 5’6″ – 5’9″ (168-175 cm): Medium (54-55 cm) 5’9″ – 6’0″ (175-183 cm): Large (56-58 cm) 6’0″ – 6’3″ (183-191 cm): X-Large (58-60 cm) 6’3″ – 6’6″ (191-198 cm): XX-Large (61-63 cm)2 |
Remember that this table provides general guidelines, and individual body proportions and preferences may necessitate adjustments. For the best fit, it’s always recommended to consult with a professional bike fitter or visit a reputable bike shop.