there's some spaniards on the light-bikes site that also have "stupid-light" components which definitely aren't offroad worthy. for me there's a fine line of ultralight to stupid light. that border to some is sooner, for others later. my build also has some components that are on the limit but for my needs everything is durable and definitely offroad worthy. i just wait for the first to spec140g, 26" Conti road slicks...i mean you could also ride them offroad...why not??