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Giant Bike Size Guide

Click here to view all of our Giant Bikes product range.

Sizing Guide for Giant Bikes.

General Guidance.

It is possible to ascertain a close approximation of the correct bike size required using the simple calculation below. However, please be aware of height, for example someone who is 6ft with a 30” inside leg versus someone who is 5ft with a 30” inside leg may need a larger frame because their body would be longer. The bigger the frame size, the longer the top tube.

The calculation that can be used to estimate your required frame size are below:

(N.B. All these measurements are a guide and Giant recommends that to get a proper idea of correct size it is best to physically sit on a bike at a local Giant dealer).

Take the inside leg measurement to the floor. Subtract 3” for mountain bikes, or 1” for road bikes, then subtract 10” which is the average distance from the bottom bracket to the ground. This will then give the approximate frame size that will be needed.

Contained in the following tables are further guides for sizing on different Giant models:

TCR Sizing 

Size

Measurement

Approx height range

Top tube length

XS

42cm

4ft 11 – 5ft 2

515mm

Small

46.5cm

5ft 2 – 5ft 6

535mm

Medium

50cm

5ft 6 – 5ft 9

555mm

Medium/ Large

53.5cm

5ft 9 – 6ft

570mm

Large

55.5cm

6ft  – 6ft 3

585mm

XL

58.5cm

6ft 3 – 6ft 7

610mm

 OCR Sizing

ize

Measurement

Approx height range

Top tube length

XS

48cm

4ft 11 – 5ft 2

515mm

Small

51cm

5ft 2 – 5ft 6

535mm

Medium

54cm

5ft 6 – 5ft 11

555mm

Large

57cm

5ft 11 – 6ft 3

575mm

XL

60cm

6ft 3 – 6ft 7

595mm

SCR Sizing

Size

Measurement

Approx height range

Top tube length

XS

43cm

4ft 11 – 5ft 2

510mm

Small

46.5cm

5ft 2 – 5ft 6

530mm

Medium

50cm

5ft 6 – 5ft 11

550mm

Large

55.5cm

5ft 11 – 6ft 3

575mm

XL

58.5cm

6ft 3 – 6ft 7

600mm

FCR Sizing

Size

Measurement

Approx height range

Top tube length

XS

42cm

4ft 11 – 5ft 2

520mm

Small

46.5cm

5ft 2 – 5ft 6

535mm

Medium

50cm

5ft 6 – 5ft 11

550mm

Large

55.5cm

5ft 11 – 6ft 3

575mm

XL

58.5cm

6ft 3 – 6ft 7

600mm

Mountain Bikes (Hardtail)

Size

Measurement

Approx height range

XS

14”

4ft 11 – 5ft 2

Small

17”

5ft 2 – 5ft 6

Medium

19”

5ft 6 – 5ft 11

Large

21”

5ft 11 – 6ft 3

XL

23”

6ft 3 plus

Mountain Bikes (Full Suspension)

Size

Measurement

Approx height range

Small

16.5”

5ft 3 – 5ft 6

Medium

18.5”

5ft 6 – 5ft 11

Large

20.5”

5ft 11 – 6ft 2

XL

22.5”

6ft 2 plus

Children’s Bikes

Size

Approximate age range

12”

2-4 years

16”

4-6 years

20”

5-7 years

24”

7-9 years

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