seller asking 400€ (good or bad price)?
Only you can decide, but there are Klein fans out there who will pay that.
I understand that pre Trek period Klein bikes are more valuable than new ones…
This is probably true, but Trek era ones still seem to be more sought after than equivalent Treks. Anyway, what somebody else thinks it's worth is moot, unless you're hoping to grab a bargain and flip it.
@märk_321 started
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Only you can decide, but there are Klein fans out there who will pay that.