1999 Klein Quantum Pro - 11 speed?

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Dirt Disciple
Hi all, I've just picked up a 1999 Klein Quantum Pro.

The plan is a respray/colour change as the current paint is a bit knackered, but I also want to put a Campag 11sp group on it. I've read that there can be an issue with 11speed cassettes, and to only use a 12 tooth small cog rather than 11.

Are there any modifications that need to be made to the frame in order for 11speed to fit?

Many thanks
 
As long as the rear stays are 130 width, no issue with 11 speed at all. The chains are ridiculously thin!

I'm running Athena 11 on an early 90's frame, got to say the groupset is a bit of a revelation, really quite tempted to get a Chorus 11 group! Your're only decision is whether to go power or ultratorque cranks. I'm running 11-25, be interested to understand what the issue is - certainly not encountered any issue at all personally.
 
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