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Chromoly Normalized CD 1.000" OD X 0.035" Wall ALLOY STEEL 4130 ROUND TUBE
Chromoly Normalized CD 0.500" OD X 0.028" Wall ALLOY STEEL 4130 ROUND TUBE
Chromoly Normalized CD 1.250" OD X 0.049" Wall ALLOY STEEL 4130 ROUND TUBE
Close to 1 1/8" Headset Tolerance 1.500 X 0.095 MILD STEEL STRUCTURAL (WELDED) ROUND TUBE
1.125" Main Tubes .7 mm = .0275" .8 mm = .0314" .9 mm = .0354"
“Bicycle Headset Tubing sizes runx
One-inch Japanese Industrial Standard (JIS)
Common on many Asian manufactures bicycles, both road and MTB Fork column outside diameter- 25.4mm (1”) Head cup race OD- 30.0mm (1.181") Acceptable head tube ID range- 29.75mm to 29.9mm (1.171" - 1.177") Fork crown race ID- 27.0mm Fork crown seat OD acceptable range- 27.1mm to 27.2mm Stem diameter at quill- 22.2mm
One-inch “Modern European” Standard
Many road bike and some MTB bikes Fork column outside diameter- 25.4mm (1-inch) Head cup race OD-30.2mm Acceptable head tube ID range- 29.9mm to 30.1mm (1.177 - 1.185" Fork crown race ID- 26.4mm Fork crown seat OD acceptable range- 26.5mm to 26.7mm Stem diameter at quill- 22.2mm
Easton 1" Headtube OD 1.375in 34.9mm ID 1.122 in 28.5mm 1-3/8" OD {A} x 1.245" ID {B} x .065" Wall {C} DOM Steel Tube (60" = $23.37)
Steer Tube 25.4 x 23.3/1.5
1-1/8" Oversized
Many MTB bikes, tandems, some road bikes, BMX bikes Fork column outside diameter- 1-1/8" (28.6mm) Head race cup OD- 34mm Acceptable head tube ID range- 33.75mm to 33.9mm (1.329" - 1.334") Fork crown race ID- 30.0mm Fork crown seat OD acceptable range- 30.1mm to 30.2mm Stem diameter at quill-25.4mm (1 inch)
1-1/4 inch Oversized
Tandems, some MTB bikes Fork column outside diameter- 1-1/4 inch (31.8mm) Head cup race OD- 37mm Acceptable head tube ID range- 36.75mm to 36.9mm Fork race ID-33mm Acceptable fork race seat OD- 33.1mm to 33.2mm Stem size at quill- 1-1/8 inch (28.6mm)
BMX (threaded, now older types)
Fork column OD- 25.4mm (1 inch) Head cup OD- 32.7mm Fork race ID- 26.4mm Stem size at quill 21.15mm (0.866") (This allows use of thick steering column for strength)"
(source - http://www.parktool.com/blog/repair-help/threaded-headset-service )