rickybails Yes for 451 wheels you need calipers - but very long reach ones. Last time I looked there was only one caliper on the market with the right reach - the Tektro R456 I think they are called (but look back in this thread to confirm).
Whew! Found it! - pg 50 of this thread.

Feel'n just a bit cross-eyed after all that skimm'n..

- thanks again! : )
Originally Posted by levity View Post
so what do you recommend? for calipers, do you know what reach i need? i have 406 wheels, and a rough measurement with a ruler suggests i need 90-something mm for the rear and a little less for the front, which is kind of ridiculous for a caliper. or if i go with cantis, what do i use for housing stops?
If you want road calipers the only option I know of is to fit 451 wheels and then the tektro R556 calipers will fit. But whether you can/want to change to the bigger wheels is another issue. The bike was designed for both 406 an 451 wheels and Peter Reich (the designer) reckons the ride is better on 451 wheels. Fewer tyres to choose from though.
For 406 wheels I'd stick with V-brakes.