I guess it would be worth it if I actually knew something about working on bikes. This summer I plan to educate myself on the basics of brake and derailer adjustment. Is it possible to true a wheel by yourself?? I usually take my bike in for that stuff. Now that my kids have grown into nondisposable bikes, I really need to know more about basic adjustments. Last year I bought both of my kids some pretty nice Specialized bikes. My daughter's rear derailer needs some adjustment from time to time but it may just be the twist shifter. I really don't like those things.