Mountain Bike Reach Chart. Because it dictates how the bike actually fits you. Why is reach the vital thing?
As year go by, mountain bike trend also evolves. Some will even have stack and reach on their bikes instead of frame size stickers. A bike with handlebars too far forward or back will ride differently particularly if you're on a mountain bike.
Please read my post regarding Mountain Bike Sizing chart here: Mountain Bike Size Chart Thankfully any bike brand worth its salt includes a reach measurement on the geometry charts of its bikes.
Sizing varies greatly between road and mountain bikes, as well as between men's and women's models, and even between.
Why is reach the vital thing? You can't make turns and handle the bike as quick and easily and overall it will feel clumsy. Most modern full-suspension mountain bikes fall in to the same camp, where the top tube measurement is misleading.. neither of which are typically present in bike design.