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~ Road Racing Mg Frames ~


Common information:

> Bottom bracket length - 68mm
> Bottom bracket thread - BSA
> Head tube inside diameter - 34mm (1 1/4")
> Fork length - 373mm
> Fork offset - 40mm
> Chain stays length - 405mm (411mm for 62cm frame)
> Wheels - 700C
> Distance between rear dropouts - 130mm
> Front derailleur clamp inside diameter - 31.9mm
> Seat post clamp inside diameter - 31.9 mm
> Horizontal top tube
> Aluminum alloy replaceable rear derailleur hanger
> Seat post shim inside diameter - 27.2mm




FRAMES GEOMETRY

Frame size
Seat tube, mm (c-top)
Top tube, mm (c-c)
Wheel base, mm
Head tube angle, degree
Seat tube angle, degree
Bottom bracket drop, mm
Head tube, mm
Fork offset, mm
48cm
518
510
959
72.5
74.5
66
95
50
51cm
551
530
971
72.5
74.0
73
119
50
54cm
585
545
971
73.0
73.0
73
147
45
57cm
616
568
991
73.0
73.0
73
178
45
Frame size = distance from bottom bracket center to top tube top.


TUBES PROFILES/SIZES (in mm)

Frame size
Down tube (oval)
Seat tube
Top tube (oval/round)
Head tube
Bottom bracket
Chain stays
(oval & con.)
Seat stays
(oval & con.)
48cm
50x38
31.8x1.9
33
42x33.9
42
32x16-17x16
21x16-17x16
51cm
50x38
31.8x1.9
41x33
40x33.9
42
32x16-17x16
21x16-17x16
54cm
50x38
31.8x1.9
41x33
40x33.9
42
32x16-17x16
21x16-17x16
57cm
62x38
31.8x1.9
41x33
40x33.9
42
32x16-17x16
27x16-17x16
Down tubes and top tubes are butted.


THE AVERAGE WEIGHT OF THE FRAMES

Frame size
Weight, g
Weight, lb.
48cm Road
1050
2.31
51cm Road
1130
2.49
54cm Road
1180
2.60
57cm Road
1280
2.82



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