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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

  • It's a totally normal saddle with a separate additional attachment to suit other posts. see here bicycles.stackexchange.com/questions/56352/… – Swifty Mar 1 at 14:43
  • The saddle you linked to comes with a clamp that fits candle style post. Best to just ignore that part and get a seat post with an integrated clamp. – linac Mar 3 at 7:50
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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:

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  • 2
    30.9 and 31.6 are very common MTB sizes, there is also 34.9 (Used by Scott for years). – mattnz Mar 1 at 20:52
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The 2020 model of the Pulsar Street uses an 31.6mm seatpost according to the Bulls website. It will most likely be the same for your 2018 model.

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