I've seen questions asked like this before here so I thought I would try:
Is this frame fake?
Klein Attitude Large Aluminum Hard Tail Mountain Bike Frame | eBay
Here is why:
1. The seat post does not have a hole for the clamp, indicating that it is either a) fake or b) newer than 1996, but I did not think there was an attitude newer than 1996.
2. Look at the dropouts. There is a funny conical weld. Even though there is a "K" in the dropout itself, the big bump in the weld is concerning and I can't find any other pictures online that confirm it.
What do you think? What year? The seller stated he did not know (#3?)
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Thread: Fake Klein Frame?