On my last century ride one rider had 4 flats (think twice about those 20mm tires, LOL). I use CO2, however usually have only 2 cartridges. I could carry more cartridges or get one of those mini pumps. After reading up on this forum I have to decide between Topeak micro rocket carbon (55 g.)or Blackburn air stik sl carbon (51 g.) What are your recommendations? Should I get aluminum pump, only about 10 g heavier for both pumps?Thanks for your opinions!