Every cyclist should have some of their key bike measurements recorded. Without this information it's going to be difficult to get your position dialed in should any of the following apply:
- You travel, pack your bike, and need to build it up again.
- Something comes loose and slips, usually the seatpost or handlebars
- You have work done at a shop, and they accidentally change something
- You install a new stem, seatpost, saddle, and/or handlebars
- You want to duplicate your position on another bike
- You want to test ride a bike and get your position close to your current bike