The Bicycle Info Project - Klein Bicycles brochure circa 1985 "Truly Magnificent"
Klein catalog from 1985.
Klein
Bookmarks
Youtube - Velofil - Building a Dream Bike on a Budget - Klein Quantum Purple Haze
Sweet Klein Quantum bike build.
What we ride: Colby's Klein Quantum
Great pics of a Klein Quantum Race with a sick paint job.
A comment asks about fitting a new bottom bracket in if it's Klein 35mm press fit, but another comment says they dropped that for english threading later in the 90s, including this bike.
Klein Problem 1
Shows Klien's unique bottom bracket, talks about Klein bike history/design.
https://jimlangley.blogspot.com/2008/01/q-klein-pressed-in-bottom-bracket.html
Klein bikes from the 80's/90's have 2 press fit bearings and a square taper spindle.
Consider just removing the bearing seals and re-greasing instead of removing the bottom bracket.
You can try knocking out the spindle with a hammer (support the frame with wooden blocks).
*Mentions a Reset Racing tool, but I can't find it now.
Articles
Press fit square taper bottom bracket
The bottom bracket on this frame is a bit unique. I have only seen press fit bearings for cranks with an attached spindle. But this one has a square taper spindle in it.
It's a 117mm spindle, and I'm looking at replacing it with a shorter one to bring the chainline in to fix issues with the Deore DX to Dura Ace conversion. I think I will have to hammer it out from one side or the other.
Klein bikes use 35mm press fit bearings. Mine has a 117mm square taper in it.