I know many of the Pre-2000 Kleins have funky steerer tube dims and/or headsets and stems. But I’ve also read that some Kleins have bottom brackets that are wider than 68 mm or press fit.
Anything else? Funky seat post dimensions? Are most 90’s road bike Kleins 130 mm rear dropout spacing?
What pitfalls await someone wanting to build up a vintage Klein frameset?