Here is another nice mod: http://dev.juppo.co.jp/2plus4/Moku_K/n104.html.

I prefer to go down to 349s for wheels, but the tire selection is great at 355. The bigger challenge on that particular bike is likely to be the 60T chainring, which pushes the chain out of the indented clearing on the rear stay. it also makes a chainguard nearly impossible, and without that, the damn chain will fall off every time the bike is folded.

Only the pre-2002 models can be taken under 8Kg, unfortunately. The new ones are brazed and reinforced for fully loaded touring, even the road "speed" model, which comes in at 10Kg with Tune bits.

I'm going to Y's Road tomorrow to replace some worn bits on my (now severely beaten up) yellow. Too bad all that fun stuff is so expensive to Yankies, thanks to our "education president." (The Yen is not 100 to the dollar!)

By the way, I'm well over 10,000 miles on my Yellow, and still love it. The only downsides have been: 1) a broken seatpost, 2) a tendency for the rear swingarm needle bearings to get water in them and rust, and 3) all the bits and pieces on the bike. The real strengths are the quality of the construction overall, the incredible versatility of the bike (on road, off road, relatively small and quick fold, fits in a suitcase pretty easily) and the ride.