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HEADSETS

Sizing Steerer Tubes using S.H.I.S.
The two sizes needed are Crown Race diameter and SHIS Stem Clamp Diameter.

 SHIS
  Straight
1-1/8"  Clamp 28.6;   Crown 30.0
1"  Clamp 25.4;  Crown 26.4/27.0		 Tapered
1.5"  Clamp 28.6; Crown 39.7
1-1/4"  Clamp 28.6; Crown 33.0
Threaded steerers are noted by adding the thread pitch to the clamp diamter (-26tpi)
Download Complete S.H.I.S. (Standard Headset Identification System) details