To measure frame size of a mountain bike, first, measure the distance from the center of the bike’s bottom bracket to the top of the bike’s seat tube. This measurement is referred to as the “seat tube length.” Then, measure the distance from the center of the bike’s top tube to the center of the bike’s seat tube. This measurement is referred to as the “effective top tube length.” Both measurements can be used to determine the appropriate frame size for a mountain bike rider. It’s important to consult a bike size chart or a professional bike fitter to ensure proper fit.

To remove the back wheel of a mountain bike, first, shift to the smallest cog. Next, release the quick-release skewer or loosen the bolts that secure the wheel to the frame. Pull the derailleur back and lift the wheel out of the dropouts. Finally, remove the cassette or freewheel from the wheel if needed.

For someone who is 5’10”, a mountain bike with a frame size between 17-19 inches should be appropriate. It is also important to consider other factors such as the type of riding and personal preferences in terms of handlebar and saddle height. It is recommended to test ride different sizes and consult with a bike specialist for the best fit.

Cycling on a mountain bike often puts a lot of strain on the lower back due to the constant jolts, undulations and movements involved in navigating rough terrain. This leads to overuse, muscle fatigue and ultimately, pain and discomfort in the lower back region. Poor bike fit, improper posture, weak core muscles and lack of flexibility can also contribute to low back pain while mountain biking.

To replace disc brakes on a mountain bike, first remove the old brake pads by loosening the pads using an Allen wrench, then remove the retaining clip or screw that holds the old pads in place. Then insert the new brake pads in the same manner as the old ones were removed. Ensure the alignment is correct and the pads are tightened and secure. Finally, test the brakes to ensure they are working properly.