- Measure your inside leg measurement to the floor wearing normal biking shoes, subtract 3" (for mountain bikes), or 1" (for road bikes) then subtract 10" (the average distance from the bottom bracket to the ground).
This will give you the maximum frame size that you will need.
But this isn't written in stone....compact frames will measure smaller and give more standover height clearance.
It is always a good idea to stand over the bike in question and check you have enough clearance ie 1"- 2" for road bikes, up to 3" for hybrids, between 3" and 5" for mountain bikes.
- Open frame ....
This is a bit different as there is no toptube as such!
What we ensure here, is that the rider has a comfortable position whereby they can reach the handlebars without stretching unduly
-
Young children's bikes have different frame and wheel size for each age band
-
Folding bikes tend to be one-size-fit-all, but with extended/telescopic seat pillar options for riders over 6' tall.
Frame size conversion table
| Inches |
Cms |
Inches |
Cms |
Inches |
Cms |
|---|
| 15 |
38.1 |
20 |
50.8 |
25 |
63.5 |
| 15 ½ |
39.4 |
20 ½ |
52.1 |
25 ½ |
64.8 |
| 16 |
40.6 |
21 |
53.3 |
26 |
66.0 |
| 16 ½ |
41.9 |
21 ½ |
54.6 |
26 ½ |
67.3 |
| 17 |
43.2 |
22 |
55.9 |
27 |
68.6 |
| 17 ½ |
44.5 |
22 ½ |
57.2 |
27 ½ |
69.9 |
| 18 |
45.7 |
23 |
58.4 |
28 |
71.1 |
| 18 ½ |
47.0 |
23 ½ |
59.7 |
28 ½ |
72.4 |
| 19 |
48.3 |
24 |
61.0 |
29 |
73.7 |
| 19 ½ |
49.5 |
24 ½ |
62.2 |
29 ½ |
74.9 |
|
