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.
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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