Extra tubes & tires are back in stock @Lectric eBikes. For how long, who knows. Also, Tannus Armour has an insert in 2 different sizes. Both should fit the XP as the listed sizes are 20x3.2-4 & 20x4-4.8 if anyone really needs that much puncture protection. I always choose to be safe than sorry, however these Tannus inserts are a little pricey as they cost $145 for a pair including the downsized tubes. For that price you could buy a complete replacement set of tires & tubes from a number of companies including Lectric, Kenda, or Vee Tire. (My XP is currently stuck at customs, so probably won't ship until next week.) I've been researching ALOT about what EBR users have picked up as far as accessories and have gotten some great ideas from Jeremiah's videos. Can't wait!