Choosing the right bike size

Why size matters so much

A frame that is too big forces you to stretch and makes the bike heavy to steer. A frame that is too small feels cramped and nervous at speed. The right size gives you a natural position where you can move your weight freely and pedal efficiently.

A size chart is the starting point

Manufacturers give a recommended rider height for each frame. The table below is indicative only – frame dimensions vary between brands and models, so always check the manufacturer's own chart on the product page.

Between two sizes

Besides height, your arm and leg length and riding style matter. A smaller size makes a bike agile and playful, a larger one stable and roomy. On the trail many riders go smaller when in doubt; for long road and gravel rides, larger. Ask us in the store – we will go through the frame dimensions with you.

Measuring your inseam

1. Stand in socks with your back against a wall, feet about 15 cm apart.
2. Place the spine of a book between your legs and lift it gently, as a saddle would press.
3. Measure from the floor to the top of the book. This is your inseam.

Inseam is used to estimate saddle height and dropper post length: the dropper must fit in the frame and let the saddle go low enough.

Reach and stack

To compare brands, look at reach (the horizontal length of the frame) and stack (its height) in the geometry chart. Longer reach gives more room and stability, higher stack a more upright position. The difference in reach between two bikes tells you more than the size label.

Fine-tuning

• Saddle height – your knee stays slightly bent with the pedal at the bottom of the stroke.
• Saddle position – level, and adjust fore and aft so that your weight is evenly distributed.
• Stem and bar – a shorter stem and wider bar make a mountain bike more stable.