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Good topic for me as I've been contemplating changing the bar/stem on my comp bike as been advised to fit a more modern combo. But I've no idea what I like to be honest, it's just a bar/stem to me at the moment. It's an Echo 24 I'm riding for comps, picked it up as really enjoyed my first ever couple of comps last year.

Thats absolutely fantastic and plenty for me to get my head around. Thank you for the detailed response 🙂  

BB height: the higher the bb is: the easier it is to stay on the rear wheel or to move on the rear wheel, the easier it is to spin, the harder is it to stay balance on two wheels or once you are in manual (less stability) Chainstay length: the shorter the chainstay, the easier you can go in manual or lift the front wheel, the easier you can move the bike on the rear wheel the less time you have to lift the rear wheel, e.g. when climbing a step, you have slightly less time to execute your extension wheelbase: the longer the more stable the bike feel on two wheels the more time you have to lift the rear wheel (see chainstay) the harder it is to put weight on the front the harder it is to move on the rear wheel or spin the most place you have to execute an extension it can ease tap or rolling onto high obstacle   Regarding the other factors, it is difficult to explain clearly. I think it is important to understand that: every change in the geometry is a compromise mostly a single change impacts the whole system (and thus feeling) it is all about weight distribution and lever effect stabilty or maniabily: you cannot have both at the same time amplitude and reaction time shall also be considered stiffness impacts also the overall bike feel   Consider weight distribution and lever effect and you will better understand how each factor affects the feeling of the bike. Let's take some examples: if you rise the bottom bracket, your center of gravity is now slightly higher compared to the rotation axle that are the wheel axles. It means, your body has an higher lever effect when you move it backwards for example. So a front wheel lift is easier ... sort of because there is another important point to consider: by raising the bottom bracket, you basically load more the front with your mass (you have more weight on your arms).  This makes the front wheel lifting for the first centimers/inches more difficult ... To compensate that, you can raise your bar. It will be easier to lift the front wheel, but more difficult to load it, i.e. front moves will become more difficult. And because you increase the distance between bottom of the front wheel and your arms, you have less place to low down you front wheel before jumping, which is also a drawback ... if you put your bar further away on an horizontal axle (i.e. same height) : you have now more place to execute an extension, so the amount of work you deliver is higher. But also you need to move more to load you front wheel, which is maybe more exhausting. You can put more weight on the front wheel if you are able too. On the otherside, it makes raising the front wheel more difficult, cause your center of gravity is slightly more forwards and your arms are more stretched if you use a wider bar: the bike is more stable, it lower your chest, you load more the front wheel. But amplitude of movement of you upper body decreases (the arm being futher apart) and because your body if further from the axle of rotation, it is harder to spin. Hope it helps!  

I use a magura louise lever with mt4 caliper combo for several weeks now and it feels OK to me. Better that with the original mt4 lever. The louise lever have some drawbacks too, e.g. they are not as strong as other maybe, but I am happy with them currently.  

Looking for a trials geometry explained guide. Have tried the search function but couldn't find anything. Does such a thing exist? I'm keen to understand what things like BB rise, chainstay length, wheelbase, stem length, stem rise, bar rise, bar pitch and other factors have on the feel of a bike.  I was also wondering if there's any sources of collated information for frames which include detailed geometry measurements. TIA