I have a khs dj-50 and it goes it out of tune quick. I jump the bike regulary, but thats what I bought it for. And I just spent $65 to tune it up. What do I do???
Learn how to true rims yourself. Jumping regularly knocks rims way outta whack. Investing in a spoke wrench can save you $65 a pop. Many websites will show you how to tension rims properly. The rest of the tune up is lube, and brake adjustment. Easy DIY stuff.
