One thing is for sure when it comes to folding bikes, not many aspects are going to chance including the frequency in which you fine tune your bike. Much like any other machine, you will need to update certain aspects of your bike. For example, over time, your chain will need to be cleaned, your brakes will need to be adjusted, and the rear derailleur may need to be adjusted. But, the question is how often should these tasks be accomplished. While this will vary depending on how often you ride your bike, Montague (which has a few bikes on this list) states that for a general rule of thumb you get a tune-up once every 90 days or so. Again, though, this will vary if you do not frequently use your bike.