This is General Size Chart, which should be helpful to find proper frame size of the bike. The most important factor is Inside Leg size. Wrong measuring may lead to the wrong frame size. So here is few tips: The best way to do it is to undress (baggy or wide cut trousers, shoes cause mistakes!) and find the highest possible crotch position. For this purpose you can use spirit level or even book, but remember it has to be completely horizontal. Measure the distance from the top of the spirit level (or the book) to the ground (not the ankle). If having problems ask somebody for help.
Childrens Bikes (with stabilisers)
Rider Age
Inside Leg
Suggested Size
Years
Ins
cm
Frame
Wheel
2 - 4
14
36
12"
3 - 5
16
41
14"
4 - 6
18
46
16"
5 - 8
20
51
11"
20"
5 - 8
21
53
12"
20"
5 - 8
22
56
13"
20"
(Bmx/Trials Bikes are suitable beyond those ages stated above by the nature of their use)
Childrens Bikes (without stabilisers)
Rider Age
Inside Leg
Suggested Frame size
Years
Ins
cm
Frame
Wheel
4 - 6
19
48
16"
5 - 8
21
53
11"
20"
5 - 8
22
56
12"
20"
5 - 8
23
58
13"
20"
7 - 12
26
66
14"
24"
7 - 12
27
69
15"
24"
Adult Mountain Bike (Hardtail)
Rider Height
Inside Leg
Suggested Frame size
ft & inch cm
inch +/- 1
cm +/- 2.5
inch
cm
4.10+ 145
27
69
13
33
5.0+ 152
28
71
14
36
5.2+ 157
28
71
15
38
5.4+ 162
29
74
16
41
5.6+ 167
29
74
17
43
5.8+ 172
30
76
18
46
5.9+ 175
30
76
19
48
5.10+ 177
31
79
20
51
6.0+ 182
33
84
21
53
6.2+ 187
34
86
22
56
6.4+ 192
35
89
23
58
Adult mountain Bike (Dual Suspension)
Rider Height
Inside Leg
Suggested Frame size
ft & inch cm
inch +/- 1
cm +/- 2.5
inch
cm
5.4+ 162
29
74
16
41
5.6+ 167
29
74
17
43
5.8+ 172
30
76
18
46
5.9+ 175
30
76
19
48
5.10+ 177
31
79
20
51
6.0+ 182
33
84
20
51
6.2+ 187
34
86
21
53
6.4+ 192
35
89
22
56
(Downhill & trials bike tend to come in limited size range due to the nature of their intended use)
Adult Hybrids
Rider Height
Inside Leg
Suggested Frame size
ft & inch cm
inch +/- 1
cm +/- 2.5
inch
cm
5.0+ 152
28
71
15
38
5.2+ 157
28
71
16
41
5.4+ 162
29
74
17
43
5.6+ 167
29
74
18
46
5.8+ 172
30
76
19
48
5.9+ 175
30
76
20
51
5.10+ 177
31
79
21
53
6.0+ 182
33
84
22
56
6.2+ 187
34
86
23
58
Road Bikes
Height Frame Size (Flat Top Tube)
4 feet 8 to 5 feet 0 46 to 48cm
5 feet 0 to 5 feet 4 48 to 50cm
5 feet 4 to 5 feet 8 50 to 52cm
5 feet 8 to 6 feet 0 52 to 56cm
6 feet 0 to 6 feet 2 56 to 60cm
http://www.all-about-the-home.co.uk/guide-to-bike-sizes-142-c.asp
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