How is road bike frame size measured?

Traditionally it is the seat tube length in centimetres, but modern fit relies on stack (height) and reach (length) for accuracy.

Should I size up or down on a road bike?

If you are between sizes, size down for a sportier, lower position or up for comfort and a more upright back. Inseam and flexibility decide.

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Road bike size

What size road bike for under 148 cm (about 4 ft 10 in)?

Recommended size

44 to 46 cm frame or junior road bike

Consider 650c wheels.

If your your height is under 148 cm (about 4 ft 10 in), go with a 44 to 46 cm frame or junior road bike. Road bikes use centimetre frame sizes and fit more precisely than mountain bikes. The right size lets you reach the bars comfortably without straining your back or knees.

Size finder — enter your height (cm)

Enter your height to see your recommended size.

Full road bike size chart

Your height	Recommended size
148 to 152 cm (about 4 ft 10 in to 5 ft 0 in)	47 to 48 cm frame (XXS)
152 to 160 cm (about 5 ft 0 in to 5 ft 3 in)	49 to 50 cm frame (XS)
160 to 168 cm (about 5 ft 3 in to 5 ft 6 in)	51 to 53 cm frame (S)
168 to 175 cm (about 5 ft 6 in to 5 ft 9 in)	54 to 55 cm frame (M)
175 to 183 cm (about 5 ft 9 in to 6 ft 0 in)	56 to 58 cm frame (L)
183 to 191 cm (about 6 ft 0 in to 6 ft 3 in)	58 to 60 cm frame (XL)
191 cm and up (about 6 ft 3 in and up)	61 to 63 cm frame (XXL)
under 148 cm (about 4 ft 10 in)	44 to 46 cm frame or junior road bike Consider 650c wheels.

How to measure

Measure height shoeless against a wall.
Measure inseam: book between legs, top of book to floor.
Use inseam to fine-tune frame and saddle height.

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What changes your size

Flexible / racy position	You can ride a slightly smaller, lower frame.
Endurance / comfort fit	Size up slightly for a taller head tube and upright back.
Brand geometry varies	Always compare the stack and reach numbers, not just the label.

FAQ

What size road bike for under 148 cm (about 4 ft 10 in)?: For your height of under 148 cm (about 4 ft 10 in), the recommended road bike size is 44 to 46 cm frame or junior road bike. Consider 650c wheels.
How is road bike frame size measured?: Traditionally it is the seat tube length in centimetres, but modern fit relies on stack (height) and reach (length) for accuracy.
Should I size up or down on a road bike?: If you are between sizes, size down for a sportier, lower position or up for comfort and a more upright back. Inseam and flexibility decide.