Minits lite are finally on! I'm the big dummy who bought the 451 tubes to lighten up the wheelset along with these tires. I had good success installing the larger tubes by distributing the slack in the tubes around the rim as I went. No problems yet, but when I do get a flat I'll be sure to check if it was due to wrinkling in the tube.

It does look like ultralight tubes for 406 tires are available from danscomp.

I love the tires- much, much less rolling resistance than stock. Small wheels spin up quickly anyway, so I'm not sure how much I'm feeling the weight difference. Holding a stock tube and tire in one hand and a minits lite and ultralight tube in the other though, there is a big weight difference there.

I'm really feeling the limitations of the stock gearing, even with adding a tooth on the big ring. White bar tape, plugs, and cable housing are next, all for looks, not performance.