To mount a tubeless mountain bike tire, first, remove the old tire and clean the rim and tire sealant residue. Install the tubeless valve stem and tighten the lock ring. Put tire sealant in the tire and install the bead on the rim, starting opposite the valve stem. Pump the tire until the bead pops into place onto the rim. Check for any leaks using soapy water, and inflate the tire to the recommended PSI. Spin the wheel and check for any wobbling or rubbing, and adjust the tire if necessary.

To make a mountain bike ramp, first decide on the height and angle of the ramp. Use plywood to construct the ramp, cutting it into appropriate sizes and shapes. Cut two sturdy braces to support the ramp, and nail them to the plywood base. The surface of the ramp should be sanded and smoothed to make it even. Lastly, paint the ramp with a weather-resistant paint to protect it from exposure to sunlight and rain. Allow the paint to dry overnight before using the ramp.

A good average speed on a mountain bike varies depending on the terrain, rider’s skill level, and distance covered. Generally, experienced riders aim for an average speed of 10-12 mph on diverse terrains. On smooth roads or paved surfaces, speeds can exceed 20 mph. However, beginners should start with a slower pace, around 6-8 mph, and gradually increase speed and skills. The primary goal of biking is to have fun and enjoy the ride, rather than focusing on attaining a certain speed.