Mountain biking is a popular outdoor activity for people of all ages, and there are many great gift ideas that cater to the love of mountain biking. Some popular options could include new mountain biking gear or accessories, a gift card to a favorite outdoor retailer, a book or DVD about mountain biking technique or history, or a subscription to an outdoor or adventure magazine. For the mountain biker who loves to explore the wilderness, you could also consider a trip to a favorite mountain biking destination or a gift certificate for a guided mountain biking tour. Other ideas could include a mountain biking-themed board game or puzzle, a mountain biking-themed coffee mug or water bottle, or a collection of mountain biking-themed movies or TV shows. Ultimately, the best gift will depend on the recipient's interests and personal style, as well as their connection to mountain biking and the outdoors.