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Something to look out for though is that some people link a bike for e.g. £250 that is absolutely terrible, this is where people should help out.   "For that cost that bike is not worth it" rather than "That bike is too heavy you won't like it".

I'd just like to say that I'm loving that rock ring. The whole bike is rad, but my eye's for what ever reason zoomed straight into the toothless chain ring. That looks sick. 🤣

So you're of the 10% exception to what i said.  I mean i'm looking for a new 20" frame, unless I want a Clean or a Jitsie there isn't much other choice right now. Hopefully that changes and some new options come out soon.

Thanks To be honest I don't actually understand all this measurements and I think I'll stay with what I got for now since I'm so inexperienced that I don't know what's good or bad for my riding. Yesterday I practiced wheelie and trackstand on my 29" Trek. What I felt after the session was that the most missing part in my little Polygon bike is... lack of gear switching. I know trials bikes are single speed too but still. Last week I changed the back gear from stock 14 teeth to 18 teeth and it's much better still hard as hell. I'm gonna change it to even bigger like 21 or 22-23 cuz I just can't kick the pedal properly when I need it. But with bigger back gear comes lack of potencial speed when riding a little distance or getting some momentum before the jump Ehhh and there goes my "multiuse" bike.

I don't have a resource to factor bar measurement into your setup, that honestly comes down to a preference more than not since you're setting up a multi-use bike. It's all pretty standard rise over run though. #Math RAD size measurement resource. https://madscientistmtb.com/rad-calculator/ Stem length comparison resource. http://www.yojimg.net/bike/web_tools/stem.php I'd hook a string to your BB and bust out a measuring tape to help you figure out what works visually on the fly. Then you can plug numbers into the stem calculator and try to match what you come up with using that. If you're not comfortable on the bike it will make it harder to learn for a lot of reasons. I used this method just now and decided a 70mm 10deg rise stem would work out better with my 80mm bar rise. Which unsurprisingly ends up making my setup look more like an extra small XC frame the way I used to set up my bikes back in the late 90's. 🤓 It's definitely a preference thing. The highest rise bar you could get back then was a 40mm which is honestly probably better if you're not a BMX'r who likes that sort of thing. I know all the street trials bikes seem to come stock with a 75mm rise but that might not feel great on your longer bike. Have fun doing math homework. Just think of it as a calculated way to save your butt. 😂