REDUCING ARM PUMP. The evil of arm pump knows no boundaries - every bicycle rider will experience it at some point. But did you know the problem usually stems from your brake setup? Read more about arm pump (and how to reduce it) at the #linkinbio. #BikeRumor #MountainBiking #Biking #armpump #mtbarmpump #enduro #mtb #lifebehindbars #braketech 📸 innesgrahamphoto