Offset
Offset
Offset refers to where the saddle clamping system is positioned in relation to the post. A zero offset seatpost has the clamp directly above the top of the post, so that the saddle will be just where you’d expect.
A setback post has an inverted/rotated ‘L’ shape at the top so that the clamping mechanism of the saddle sits just aft of the post. This is quite useful if you’re requirements for the bike’s dimensions are different to those that a frame provides – in other words, you wouldn’t quite fit on a frame with a zero offset post. It’s just another way to tweak the fit of a bike to a rider. However, if you use a setback seatpost with the saddle shoved all the way forward, this is called madness. Seriously, get a new seatpost. Or frame.
Setback posts usually come with 25 or 32mm of setback as the standard options, although it is possible to find posts with plenty of different amounts if you shop around.
It’s also possible to get forward offset posts, although they’re a lot rarer. These will push the saddle forward of the seatpost and, again, are popular if your bike doesn’t quite fit properly, or if you’re trying to convert a road bike into a TT machine and want to be further over the bottom bracket.
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