The E3 definetely has a 1" steerer, not sure about the E2, E4 or the O series frames though, i know the early Elite and O's were 1.1/4
Beat me to it.
For some reason Orange used Series 9 tubes for the E3 not Easton Elite.
The E4 is certainly Easton Elite, and has a 1 1/8
Modern: Cotic Solaris | Cotic Escapade
Retro: 1988 MF Explorer | 1991 DB Apex | 1992 DB Response | 1994 GT Zaskar LE
WANTED: RS Mag 21 with 1/18" unthreaded steerer | USE Stealth forks or spare parts