Mountain Bike Frame Geometry Calculator. Mountain bike frame sizes are slightly different and the units used in bike sizes vary depending on type and brand. Road race bikes; Enduro mountain bikes; Endurance road bikes; TT and Tri bikes; CX bikes; Gravel bikes; Target: all the bikes.
You can find these measurements by scrolling to the geometry chart on each mountain bike's detail page. Now you can take your calculator and quickly find the right size: Review: Best Gravel Bikes To Buy. You can read about the different bike types here.
That's a system used for some road bikes too: Merida's road bikes go through S, S/M, M/L and L.
If you are looking to buy an e-bike, the size of an e-bike varies depending on the type of e-bike, such as: e-city bikes, e-touring bikes, e-mountain bikes, etc.
Test size and fit of a frame before buying. MTB's are engineered for off-road riding. Having a bike that is comfortable motivates us to get out and ride.