The specialized road tube spool is a simple compact system thatll carry everything you need to fix a flat without weighing you down to do so its design allows for a spare tube with up to an 80mm valve stem to be rolled up without damaging the tube meanwhile the spool can easily hold a lever co2 cartridge and a valve head the patent pending design allows the spare tube to be rolled up while protecting valve stem from rubbing a hole through the rubber co2 valve head and two sided tire