To measure the frame size of a mountain bike, start by standing against a wall and measuring the distance from the ground to your crotch. This measurement (in inches) will give you the standover height. Next, measure the length of your inseam (in inches) and subtract 3 inches. This will give you an approximate frame size that will provide a comfortable ride based on your body size. Finally, consider the specific geometry and fit of different mountain bike brands and models to find the best fit for you.

Cleaning mountain bike gears involves using a degreaser to remove any build-up of dirt, grime, and old lubricant from the chain, gears, derailleurs, and cassettes. After spraying the degreaser onto the dirty parts, use a brush to scrub them clean, before rinsing them with water and drying them off. Once the parts are dry, spray them with a lubricant to prevent any rusting and ensure smooth gear shifts.