Originally Posted by
europa
It is not unusual for a spoke to break in a new wheel, particularly low end wheels like yours. This is because they are nearly all built by machines and the spoke tension varies around the wheel. A good shop will retension new wheels before they're sold which goes a long way towards preventing breakages but not all shops will do it will do it for all bikes.
I
Now that you've had a breakage, keep an eye on things because you may have other spokes about to go.
A properly tensioned wheel will go for a long long time without any truing or spoke breakages. Your bike shop would have checked this out in the repair so you should be right from now on. I've only had one wheel that refused to behave and that was hand built, but I've always suspected the drive side spokes were too short (sold the sod now)
+1
Good bike shops are few and very far in between. Good bike shops used to rebuild all new bike wheels out of the box to bring them to even a balance of even tension and radial and lateral true. Finding the sweet spot of a given selection of rim, spoke, nipple, tension isn't something that usually can be done "one-off". Essentially it's a balance of trying to bring the wheel up to the highest tension it can handle without tacoing, or pulling spokes through the rim, excessively.
Sounds like the shop you bought the bike from unpacks new bikes from the box puts them together and sells them "as-is" new. If you took the bike back to the same shop you bought it from with less than 400 miles on the bike AND they charged you to repair the broken spoke you learned a valuable lesson: Never go to that shop again