To measure your reach for a mountain bike, start by standing against a wall with your feet shoulder-width apart. Hold a straight object like a ruler or broomstick horizontally against your crotch, and mark the spot where it meets the wall. Measure the distance from the mark to the floor. Then, measure your arm span by standing with your arms outstretched and measuring the distance from fingertip to fingertip. Subtract your arm span from your height to get your reach. This measurement will help you choose the right size bike for your body.

To sell your mountain bike, start by cleaning it up and assessing its condition. Take high-quality photos and write a detailed description of the bike including any upgrades or modifications. Determine a fair and reasonable price based on the bike’s age, condition, and market value. List the bike for sale on online marketplaces such as Craigslist or eBay or through local classified ads. Be responsive to inquiries and negotiate the price if necessary. Finally, arrange a safe and secure payment and delivery method for the bike.

To make a mountain bike tire tubeless, start by removing the tire from the rim. Then, install a tubeless rim tape and valve stem, followed by adding tubeless sealant to the tire. Next, re-seat the tire onto the rim and inflate it to the proper pressure. Lastly, check for any leaks and make any necessary adjustments to ensure the tire is sealed and ready for use.