Are you looking to buy a BMC 257 AL ST (Step-Through) but aren’t sure which frame size to choose? We have compiled the manufacturer’s recommended sizing metrics into the easy-to-read table below to ensure you get the perfect ride.
BMC 257 AL ST (Step-Through) Height Sizing Chart
| Frame Size | Rider Height (Imperial) | Rider Height (Metric) |
|---|---|---|
| S | 0″ – 5’7″ | 0 cm – 169 cm |
| M | 5’7″ – 6’1″ | 170 cm – 185 cm |
Urban & Commuter Fit Tip: These frames are designed for an upright, high-visibility riding posture. The sizing is often more forgiving, but ensure the reach to the handlebars doesn’t force you to hunch your shoulders.
What to Do if You Are Between BMC Sizes?
It is incredibly common to find your exact height overlapping between two different BMC 257 AL ST (Step-Through) frame dimensions. When this happens, your riding style and physical proportions should dictate your choice:
Choosing the smaller option gives you a shorter reach to the handlebars, creating a more upright riding position. Opting for the larger frame extends the wheelbase, delivering a highly stable ride at high speeds.
How to Measure Your Height for an Accurate Fit
Finding the perfect frame size requires precision. We highly recommend measuring your current barefoot height rather than guessing. Stand flush against a doorframe, ensure your shoulders are relaxed, and use a tape measure from the floor to the top of your head to get the exact figure. Use a flat-edged object or book resting horizontally on your head to mark the point accurately against the wall before running a tape measure to the floor.
Calculate Your Size Instantly
Input your exact dimensions into our interactive calculation tool below to double-check your frame measurements and explore alternative brand frame shapes.
BMC Bike Size Calculator
Find the perfect frame size for your new BMC bike. Enter your height below to get a precise recommendation.