Bike seat and post recommendation Yesterday someone stole my bike seat along with the seat post. I am planning to buy a new seat with post that fits it. My bike is a Bulls Pulsar mountain bike. I have found a seat on Amazon but I have not found a seat post that would fit this seat. I request for your help. Thanks.

https://www.amazon.de/dp/B07DB3KVPS/ 

and this is my bike:

https://www.radonline.de/bulls-pulsar-street-21-gang-kettenschaltung-herrenfahrrad-trekking-modell-2018-26-zoll-schwarz-matt.html
You need a "seat post" which has to be exactly the same diameter as the old one.

The specs page only says "Seat post: STYX aluminum" which is not enough information.

Your best option would be to close the clamp to its normal position, and measure the internal diameter of the frame using calipers.  A ruler won't be accurate enough, because while common seatposts could be in these sizes:


25.4 mm
26.2 mm
26.8 mm
27.2 mm
28.6 mm
31.2 mm etc


It is not impossible for the seatpost to be some weird in-between size.

The overall length of the seatpost is less important, only that it is long-enough.

You'll also need a seatpost with an integrated clamp at the top, or a separate clamp.  Very likely whatever you buy will have a clamp included.



Separately - someone has stolen your bike seat once already.  Expect that it will happen again.  Some relevant links to protect your parts:


Protecting quick-release seats and wheels from theft
Quick release saddle bolts?