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Location: Rochester, NY
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Bikes: Stewart S&S coupled sport tourer, Stewart Sunday light, Stewart Commuting, Stewart Touring, Co Motion Tandem, Stewart 3-Spd, Stewart Track, Fuji Finest, Mongoose Tomac ATB, GT Bravado ATB, JCP Folder, Stewart 650B ATB
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How far inside the HT is the reamed portion? How long are the Tange headset cup "skirts"? Will removing some HT face get the headset skirts to contact un reamed HT ID? How much face removal to do so is needed? Your measurements will guide you in these aspects.
Any HT face removal will change the head angle It's a question of how much removal and thus what angle change. You could run the math to actually find out but people run different tire heights (widths) all the time and they don't crash from loss of steering control solely due to one tire being bigger then the other.
Unsure what you mean by "what a factory reamer should cut at". Are you meaning the ID, the depth of cut the angle (if any) of the resulting face's edge? I highly suggest at least a skimming of the HT face to insure the cup's sits square to the HT axis. Andy
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AndrewRStewart