Hey guys took my bike out tonight, I cannot change the tire size, I'm one of the guys that just got theirs this week. I rode to my father-in-law's house. On my phone I turned on "map my ride" it showed 4.9 miles. The bike showed 3.7 miles. I immediately downloaded a new speedo app and reset the trip odometer. Set off again. Stopped when bike odo showed 3.7 miles and checked my new app. Guess what 4.9 miles. I live in an area where the main roads are exactly 1 mile apart so I checked my new speedo app and it was correct. So then rode the bike for one mile on its odometer and check the speedo app and it showed 1.3 MI. So for every 1 mile on my bile odo im actually doing 1.3. Just good to know when your estimating a trip. It also made my 25 mile full charge first run a more respectable 33 miles. Happy trails. Not complaining just fyi