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.


and this is my bike:


  • 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, 2020 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, 2020 at 7:50

2 Answers 2


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:

  • 2
    30.9 and 31.6 are very common MTB sizes, there is also 34.9 (Used by Scott for years).
    – mattnz
    Mar 1, 2020 at 20:52

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.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.