What seat and how to install it in Birel S15 KZ

Until now I had a tillet t11 ​​but it broke and now I have an original freeline seat.

Both of those seats should work just fine for that kart. But if you’ve never installed a seat before, doing it properly can be a daunting task. Its very critical that your seat is set up properly otherwise the kart will handle poorly.

This thread should help out with guides and diagrams and such.

Here’s your reference chart.

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I haven’t noticed any performance difference between the soft Tillet and soft Freeline. Dimension C is the critical dimension. The other ones tend to fall in place if you get C right. Hovering around 14cm has been a great starting point in my Compkart. Very similar to Birel.

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