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Chak
edscoble
Velo Vitality, normally I buy direct from America, but like to support a local shop that sell the Compass/Grand Bois stuff.
The biggest difference is the casing, the rubber is exactly the same between the normal and ultralight, so it'll last as long as the normal but the ultralight have a thinner casing, which result in a more supple ride at the same pressure.
I use the Compass Loup Loup Pass (38mm) in Ultralight, and it's brilliant in audaxes where you'd want the most comfort and speed, but on my tourer, being a tourer and commuter, a thicker sidewall make sense.