This chart provides a starting point for sizing a fixed gear or track bicycle.
⚠️ The “Fixie” Rule of Thumb: Fixed gear frames often have a higher bottom bracket (to prevent pedals from hitting the ground in turns). This raises the top tube. If you are between sizes, it is usually safer to size down on a fixed gear bike to ensure comfortable clearance between you and the top tube.
Fixed Gear Frame Size Chart
| Rider Height (ft/in) | Rider Height (cm) | Inseam (Inches) | Suggested Frame Size |
|---|---|---|---|
| 4’10” – 5’1″ | 147 – 155 cm | 26″ – 28″ | 47 – 49 cm (XXS/XS) |
| 5’1″ – 5’4″ | 155 – 163 cm | 28″ – 29″ | 49 – 51 cm (XS/S) |
| 5’4″ – 5’7″ | 163 – 170 cm | 29″ – 30″ | 51 – 53 cm (S) |
| 5’7″ – 5’10” | 170 – 178 cm | 30″ – 32″ | 54 – 55 cm (M) |
| 5’10” – 6’0″ | 178 – 183 cm | 32″ – 33″ | 56 – 58 cm (L) |
| 6’0″ – 6’3″ | 183 – 190 cm | 33″ – 34″ | 58 – 60 cm (XL) |
| 6’3″ – 6’6″ | 190 – 198 cm | 34″ – 36″ | 61 cm + (XXL) |
Critical Sizing Factors
While the chart gets you close, fixed gear geometry is unique. Consider these three factors before buying:
1. The Standover Gap
Because fixed gear bikes are derived from track racing, they are often “square” (the seat tube and top tube are roughly the same length) and have high bottom brackets.
- The Test: When standing flat-footed over the bike, you should have at least 1 inch (2.5 cm) of space between your groin and the top tube.
- The Risk: If you buy a frame based solely on height, but you have shorter legs (inseam), you might hurt yourself during a sudden stop.
2. Street vs. Track Fit
- Street/Commuter: Many riders prefer a slightly smaller frame. It shows more seatpost (which looks “pro”) and makes the bike more flickable and maneuverable in traffic.
- Velodrome/Track: Racers often prefer a slightly larger or longer frame for stability at high speeds and to get their upper body lower and more aerodynamic.
3. How Manufacturers Measure (C-T vs C-C)
Not all “55cm” frames are the same size.
- C-T (Center to Top): Measured from the center of the crank to the very top of the seat tube. (Most modern aluminum frames).
- C-C (Center to Center): Measured from the center of the crank to the center of the top tube intersection. (Classic steel frames).
- Note: A 55cm C-T frame is effectively smaller than a 55cm C-C frame. Always check the brand’s specific geometry chart.
How to Measure Your Inseam (The Book Method)
Do not use your pant size. It is inaccurate for cycling.
- Stand against a wall with your cycling shoes on.
- Place a hardcover book between your legs, spine up, pressing it firmly into your groin (simulating the saddle pressure).
- Mark the wall at the top of the book spine.
- Measure from the floor to the mark. This is your cycling inseam.