What size gravel bike do I need?

Gravel bikes use the road bike sizing system in centimetres. Calculate your size with: inseam × 0.65 = frame size in cm. Many gravel riders prefer one size smaller than their road bike for better off-road control and a more upright position.

Is gravel bike sizing the same as road bikes?

The sizing system is the same (in centimetres) but gravel geometry is different: a shorter reach, higher stack, and longer wheelbase for stability on loose surfaces. This means a gravel bike of the same nominal size will feel different to a road bike.

What is stack and reach in gravel bikes?

Stack is the vertical distance from the bottom bracket to the top of the head tube. Reach is the horizontal distance. Gravel bikes have a higher stack (more upright position) and shorter reach than road bikes, improving comfort and control on rough terrain.

Gravel vs road bike size: should I size down?

Most manufacturers recommend the same nominal size as your road bike. However, many experienced gravel riders choose one size smaller for a more manoeuvrable bike on technical terrain. If you plan long-distance bikepacking, stick with your road size for comfort.

Gravel Bike Size Guide: How to Choose the Right Fit

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Inicio › Gravel Bike Size Guide

Published: May 2026

Gravel bikes — the fastest growing segment

Gravel bikes are the most versatile bicycles on the market. They combine the speed of a road bike with the off-road capability of a mountain bike, opening up routes that neither discipline could tackle alone. But sizing a gravel bike has its own rules — it's not just "a road bike with wider tyres".

Gravel size chart

Gravel bikes use the road bike sizing system in centimetres. The formula: frame size = inseam × 0.65. However, gravel geometry differs significantly from road.

Height	Inseam (cm)	Gravel frame (cm)	Size
1.55 - 1.65 m	68 - 74 cm	44 - 48 cm	XS
1.65 - 1.73 m	74 - 79 cm	48 - 51 cm	S
1.73 - 1.80 m	79 - 83 cm	52 - 54 cm	M
1.80 - 1.87 m	83 - 88 cm	55 - 57 cm	L
1.87 - 1.95 m	88 - 93 cm	58 - 60 cm	XL
> 1.95 m	> 93 cm	61 - 63 cm	XXL

Gravel geometry explained: stack and reach

Unlike traditional bikes where only the seat tube length matters, gravel sizing relies heavily on two measurements: stack and reach.

Stack: the vertical distance from the bottom bracket to the top of the head tube. Gravel bikes have a higher stack than road bikes → more upright, comfortable position for long hours on mixed terrain.
Reach: the horizontal distance. Gravel bikes have a shorter reach → the handlebars are closer, giving better control on loose surfaces and reducing lower back strain.

Gravel vs road: key differences

	Road bike	Gravel bike
Position	Aggressive, aerodynamic	Relaxed, endurance-focused
Stack height	Lower	15-30 mm higher
Reach	Longer	10-20 mm shorter
Wheelbase	Shorter (agile)	Longer (stable)
Bottom bracket	Lower	5-10 mm higher (clearance)
Tyre clearance	25-32 mm	40-50 mm

Should you size down for gravel?

There are two schools of thought:

Same size as road: recommended for bikepacking, long-distance comfort and riders who spend significant time on paved roads.
One size down: preferred by riders tackling technical singletrack, steep descents and those who prioritise manoeuvrability. A smaller frame with a longer stem gives a sportier feel.

If in doubt, stick with your road size — it's easier to make a slightly larger gravel bike more comfortable than to fix one that's too small.

Find your gravel bike size

Enter your measurements and get your exact gravel bike frame size instantly.

Calculate your gravel size →

Always check the manufacturer's specific geometry chart. Stack/reach values vary significantly between brands and models.