Choosing The Right Size

Choosing the right sized bike is essential.

Adult bike sizes are normally measured from the top of the seat tube (where the seatpost fits into the frame) down to the centre of the bottom bracket axle (the axle which carries the pedal cranks).

With the correct frame size you should be able to sit on the saddle with your feet on tip-toes touching the ground on either side, and you must be able to reach the handlebars comfortably.

It is sometimes worth considering a smaller frame with the saddle raised slightly in order to obtain a more comfortable reach.



The sizing chart below gives a guide to frame sizes against inside leg measurements. The correct way to measure your inside leg is from your crotch to the floor making sure that your feet are flat on the ground.

Giant

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).

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

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

 

Dawes Bikes Size Guide

The following chart is to be used only as a guide to sizing your Dawes bicycle. It is intended for use only with adult wheel (26” & 700c) bikes but each specific bike will differ due to its geometry and components.

This can affect how comfortable the bike feels to each individual.

Frame size                    Inside leg range

13”                                23”-28”

14”                                24”-29”

15”                                25”-30”

16”                                26”-31”

17”                                27”-32”

18”                                28”-33”

19”                                29”-34”

20”                                30”-35”

21”                                31”-36”

22”                                32”-37”

23”                                33”-38”

GT

GT HARDTAIL

5'4" and down

5'7"

5'10"

6'1"

6'4"

 

 

 

 

 

 

XS

 

 

 

M

 

 

 

XL

 

 

 

 

 

 

 

 

S

 

 

 

L

 

 

 

 

 

 

 

 

 

 

 

GT FULL SUSPENSION SIZE GUIDE 

5'4" and down

5'7"

5'10"

6'1"

6'4"

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

M

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

S

 

 

 

 

L

 

 

 

 

 

 

 

 

GT ROAD BIKE SIZE GUIDE

 

5'4" and down

5'7"

5'10"

6'1"

6'4"

 

 

 

 

 

 

XS

 

 

 

 

M

 

 

 

 

XL

 

 

 

 

S

 

 

 

 

L

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Kona Bike Size Guide

 

KONA ROAD
Frame Height
49cm 5'0"-5'4"
53cm 5'5"-5'8"
56cm 5'8"-5'10"
58cm 5'11"-6'0"
61cm 6'0"-6'4"
KONA MTB
Frame Size Height
14" 5'0"-5'2"
16" 5'2"-5'4"
17" 5'5"-5'7"
18" 5'8"-5'10"
19" 5'11"-6'1"
20" 6'2"-6'3"
22" 6'4"+

 

Mongoose Bike Size

              MONGOOSE HARD TAIL SIZE GUIDE

Frame Size

Height

S

5'7"

M

5'8"-5'11"

L

6'0"-6'2"

XL

6'3"

 

MONGOOSE FULL SUSPENSION SIZE GUIDE

Frame Size

Height

S

-5'7"

M

5'8"-6'1"

L

6'1"+

 

MONGOOSE ROAD 700C SIZE GUIDE

Frame

Inside Length Leg

Height

S

27-30"

5'5"-5'7"

M

30-32"

5'8"-5'10"

L

32-34"

5'10"-6'1"

XL

34-36"

6'1"-6'3"

 

 

Raleigh

You be sure what size bicycle you require before purchasing.

This is only a guideline,

Frame Size Inside Leg Range
14" 24"-29"
15" 25"-30"
16" 26"-31"
17" 27"-32"
18" 28"-33"
19" 29"-34"
20" 30"-35"
21" 31"-35"
22" 32"-37"
23" 33"-37"

 

 

 

 

This is only a guideline, For more help please phone 01298 22002