Mountain Bike Gear Inch Calculator. Also take a look at our complete bicycle gear ratio chart below to see how your size compares to other gearing options. More than ever people ask nowadays: "What gears to choose for my bicycle?".
My main passion on a bike is long steep low gear grinding hills (think of grinding up the face of Aspen Mountain on Summer Road). When chain-drive bikes came on the scene, the gear-inch calculation was adapted to accommodate: (Chainring Teeth / Cog Teeth) x Rear Wheel Diameter (wheel & tire) = gear. Simple, just divide your rear cog size from your front chainring size.
The problem with gear ratio is that it calculates the number of rotations of the rear wheel for every rotation of the crank, but it ignores the diameter of the rear wheel.
The calculator only works for a single speed at a time.
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. The bicycle gear calculator displays graphically the gearing of derailleur gears and gear hubs. More than ever people ask nowadays: "What gears to choose for my bicycle?".