Very much agreed. You'll want to run V-brakes or cantis if you do this,
as swapping wheels with disc rotors that will invariably not line up is
just as annoying as a tire swap.

Don't forget...if you do decide to buy an extra set of wheels (and you
have V-brakes), make sure both sets of rims have the same (or similar)
width.

If the width is identical on all your rims, then you shouldn't require
any adjustment of the V-brakes. If the widths are slightly different,
you should be able to use the barrel adjuster on the brake lever to
compensate without messing with your brake setup.

I am in the unfortunate situation where my rim widths are not equal.
In addition to the barrel adjuster on the brake lever, I have installed
in-line adjusters at the V-brake noodle. The extra adjustment allows
me to set a quick brake response (i.e. pads as close to rim as
possible) without having to tool around with the brakes.

HTH,
Dave

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