I am currently in a dispute with an eBay vendor about the sizing of a threaded headset I purchased. Before I initiate a refund claim, I would like to make sure I'm in the right.
The headset's manufacturer is XLC and the model is HS-S01. The eBay listing describes its dimensions as "1" EC30/22.2 EC30/26.4". When installing it on my bike frame, the cups went into the headset bore without requiring any press-fitting, and they are so lose that they slide right off when not held in place.
The frame has a headset bore of 30.1mm. According to my research from the Park Tool documentation and other sources, this is compliant with the EC30 SHIS standard, and a headset advertised as EC30 should achieve proper press-fit.
There is actually no mention of a SHIS code on the part label, which simply describes the item's dimensions as 22.2/30.0/26.4. It's unclear if the 30.0mm figure refers to the frame bore diameter, as the manufacturer's website seems to indicate (see the link to XLC above), or the cup diameter. On the part I got, I measured a 30.03mm cup diameter.
My argument is that the vendor's mislabeled the item by adding the EC30 SHIS code, which specifies a bore diameter that is incompatible with the part, regardless of how you interpret the manufacturer's labeling. If anything, this is an EC29 part, which would fit the actual cup size.
Based on the information above, is that argument correct?