I am 186cm / 96kg and ride a Mu XL Sport with 20x2,35" Big Apples. This combination works really well for big & heavy riders. You could get even more stability by changing the handlepost (e.g. for the single piece left folding one on the Mu Uno) or do an ahead stem conversion. I did MTB racing years ago, still ride my folder with bunnyhops over curbs etc, works ok with some care on soft landing.