Do you have a bike that you're really, really fond of that you prefer for most of your rides? But does it come not-quite-as-close to perfection for some rides? Have you thought about maybe getting a similar bike, and setting it up with slightly different gears, bars, etc. to make it better for those other rides? Something besides swapping the tires and wheels to 'dial-in' for perfection riding.

I have a really sweet GT Xizang that I bought new in 1995. She's titanium with all late model Shimano XTR components. Hardtail rear with front suspension. Rear rack. I'm using her more for road, commuting and some touring.

Now, I'm looking at buying another GT Xizang titanium frame - same hardtail and same size. But I'm looking to build up with slightly different parts for special trail rides.

I'm wondering right now if it's a good idea. Do any of you have any experience with having non-identical twins - or suggestions?