What does 1 1/8" headset mean? Will this headset work on my bike?

grungeant

New member
My bike has threaded forks. The manufacturer's spec on my bike says it has a 1 1/8 headset. I bought a 1 1/8 headset on ebay. I was under the impression that 1 1/8 headset meant that the diameter of the hole in the head was 1 1/8th inch (28.6mm) Now when I look at the specs on the 1 1/8 headset I bought the spec on the part that will actually be pressed into the head says 30.0mm. Wouldn't that mean the headset is 1 1/4?
Will this headset work on my bike or did I buy a part I can't use?
 
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