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Not positive, but...

I have a '99 Klein Quantum Race. Back then the Quantum came with Shimano 105, the Quantum Race with Ultegra, and the Pro with D.A. and a nicer fork. In other words, same frame but different components and fork depending on the model. Klein has a website, if you contact them a live person will respond with answers, but it might take a few days.
 
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