If you’re new to rollers (as I am), set this up in a doorway instead of by one wall. You can use your shoulders/upper arms on the doorframe this way, when needed, and make it way harder to slip off. It helps if you have a smaller than average doorframe, too. When the front wheel wigs out, pedal harder to straighten it. YouTube tips help! I haven’t fallen off once but I would have if I didn’t have “walls” hugging me on both sides.I had to adjust the front roller to the furthermost slot for my “X-small” 29” mtb with a wheelbase 1065 mm, and it is a hair away from being too short. Still stable enough, though, so I’m happy with it.I also loosened the rollers with the two included wrenches as the rollers are probably too factory-tightened. You need to hold the wrenches on both sides to adjust them. If the roller clicks after adjusting, you did it unevenly.Funny mistake I made: I thought the plastic belt had to reach the back roller, too. So I spent a comical amount of time trying to remove it without taking it all apart. Then I gave up and tied it out of the way, got the extra plastic roller included in the box and did it my way. Just now realized I set it up wrong. Still worked. It’s really sturdy considering all I did, and how it folds/unfolds with regular use.I tested it on my regular treaded tires while I wait for the right ones to arrive, so it is noisier (sounds like an old school treadmill with an extra buzz) but I don’t have close neighbors to annoy for 15-30 mins at a time.