the colder it gets, the less happy I am about them. 2 nites ago was outside snacking mid-ride at a bike friendly cafe w 2 floor pumps out front. temps were in the mid 30s but I was dressed for it. young man pulls up (just a sweater & no gloves) & I assume he's locking his bike to go inside. he's there a long time & that's all I noticed. as I was walking past him with my bike to start homeward I ask if he needed help w anything. he says: "yeah actually" turns out his rear tire was low but not flat (unknown reason) & he was having trouble filling it with the pump. simple schrader valve, chose the correct pump (nice cafe has 2 pumps 1 w schrader head 1 w presta head) showed him how to insert valve & lock the pump head by lifting the lever & made him pump it. he did 2 pumps & I'm like "dude you're low on air keeping going!" anyway, problem solved ... maybe