Size table:
Adapter code
Head tube outer size
Length between the front of head tube and the back of the welding of top and down tube connection (See the picture!)
A1
3/4"
0cm and have 2 cm free space between top and down tube
A2
1"
0cm and have 2 cm free space between top and down tube
A3
1 1/4"
0cm and have 2 cm free space between top and down tube
A4
1 1/2"
0cm and have 2 cm free space between top and down tube
B1
3/4"
0-9 cm
B2
3/4"
9-12 cm
B3
3/4"
13-18 cm
B4
1"
0-9 cm
B5
1"
9-12 cm
B6
1"
13-18 cm
B7
1 1/4"
0-9 cm
B8
1 1/4"
9-12 cm
B9
1 1/4"
13-18 cm
B10
1 1/2"
0-9 cm
B11
1 1/2"
9-12 cm
B12
1 1/2"
13-18 cm