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Differing Units for Steerer Tubes

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Differing Units for Steerer Tubes

Old 07-09-07, 03:25 PM
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clichty
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Differing Units for Steerer Tubes

As I was trying to fall asleep last night I had an odd thought...Why is everything on a bike measured in metric units except for the steerer tubes? Instead of having 1 inch or 1.125 inches why not have 25.4 mm or 28.575 mm? 1 inch is a nicer number than 25.4 mm, but there are all sorts of differing sizes for seat posts and handlebars.
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Old 07-09-07, 03:55 PM
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Perhaps the bearing manufacturer that designed the most popular components were American?? I’m sure Sheldon Brown (in his infinite knowledge of all things bike) would know….

I’d also like to know why there are even two diameters in the first place? What was so bad about 1 inch that made everyone go to 1 1/8? I see a few frames are going back to the 1 inch design (like the new specialized tri/TT bike, they claim the reduced width is significantly more aero)
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Old 07-09-07, 04:59 PM
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Originally Posted by Ti-tillIdie
Perhaps the bearing manufacturer that designed the most popular components were American?? Im sure Sheldon Brown (in his infinite knowledge of all things bike) would know.

Id also like to know why there are even two diameters in the first place? What was so bad about 1 inch that made everyone go to 1 1/8? I see a few frames are going back to the 1 inch design (like the new specialized tri/TT bike, they claim the reduced width is significantly more aero)
And I see other ones going to a 2" steerer tube and integrated carbon stem and bar. Um.. cannondale maybe?
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Old 07-09-07, 05:02 PM
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Originally Posted by Ti-tillIdie
Perhaps the bearing manufacturer that designed the most popular components were American?? Im sure Sheldon Brown (in his infinite knowledge of all things bike) would know.

Id also like to know why there are even two diameters in the first place? What was so bad about 1 inch that made everyone go to 1 1/8? I see a few frames are going back to the 1 inch design (like the new specialized tri/TT bike, they claim the reduced width is significantly more aero)
The same wall thickness will give roughly 40% more strength in bending with the larger diameter.

Or conversely, you can use a lot less material and get a lighter bike.
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Old 07-09-07, 05:03 PM
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Don't forget tapered steerer tubes going from 1-1/8" to 1-1/2"
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