Not all shops carry metal stems, supports, etc. I've already experienced the stem failure w/o the support due to my ignorance and the shops but they fixed it for free. Found the supports on EBay 10 for $15! Basically remember to plan for the tire changes as you are going to be the one dealing with the failure. Mine happen a 1/8 of a mile off a I65 ramp and a local GW rider on his way to Iowa came back to help me
