There are, as always with bike parts, also to seatposts a lot of accessories and spare parts. The more sophisticated your seatpost is, the more accessories you can buy. In the first place, there is of course a saddle clamp, without which you can not mount the support. On top of it belongs the saddle, so your seat is complete. When mounting, be sure to use a torque wrench, which will prevent your saddle from being too loose or too tight.
Accessories to rigid seatpost
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There's really not much to say about a rigid seatpost. Unless it doesn't fit your bike. With a Reducing sleeve you can then adjust the inner diameter of the seat tube to the too small diameter of the seatpost. Unfortunately, this does not work the other way around. A too thick seatpost simply does not fit in a too small seat tube. To shorten a rigid seatpost that's too long, you'll need tools, and to attach a carbon seatpost you'll also need carbon assembly paste.
Dropper Post Accessories
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There are special trains for mechanical variostruts. Many bikers swear by shift cables, others prefer to buy a seatpost cable. Here on Bike Mailorder you can get both, just try out what you like better!
Also bleed kits are available to buy specifically for variator posts, you'll need one to service your hydraulic dropper.
Here in the bike store you can also buy remote levers, they are available for MTB flatbars and for dropbars, so specifically for gravel bikes.
Accessories to the suspension seatpost
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A suspension seatpost needs significantly fewer accessories than a Variostütze, only the springs or the elastomer of the damper must be replaced if they have lost after a while to clamping force. Also to adjust the support to the rider's weight, the suspension can be replaced.
Further accessories around the seatpost
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A few add-on parts do not have to do with the seatpost directly, but are mounted there. These include mudguards that are bolted to the seatpost and, of course, rear lights with battery. If you buy such clamping mudguards or bike lights, you should make sure that they also fit the diameter of the seatpost. Often, the clamps or retaining straps are flexible and thus suitable for different widths. If not, the appropriate measure is in the item description. Also larger saddle bags, especially the "Arschrakete" popular in bikepacking, usually have a retaining strap that fixes the bike bag to the seatpost. But here are usually Velcro straps at work, which can be adjusted to any diameter.
As a quick breakdown aid for bike tours, there are also small tool sets that can be attached to the bike with a Velcro strap. They hold either to the frame or to the seat post. For the dreaded flatfoot on the road, there is the practical combo of mini pump, CO2 cartridge and spare tube also as a pack with strap, you can also lash them to the seatpost.
With all these attachments, however, something caution is required if you have a carbon seatpost or a dropper!
