Guys, good thing to read that other people are also looking for alternatives. I'm trying to keep my paso quite original, cause I like the appearance better than for example the 907ie. The bigger 180 tire looks great on the bike as well. So I'm convinced my paso can keep her 16" wheels now. The drive line is also keeping me busy. As I've seen in this post we can try three options:
1. more offset of the drive line
2. 'excenter' the rear wheel
3. Mix of the two above
As for option number 1 we've seen the 180/60 tire fits well. My problem is the offset of the front sprocket. As you might know the early paso's (till enginenumber 4000 or so) have a weak bronze bushing on outgoing axle of the gearbox. I've seen this go wrong with 750 paso's with a lot of miles on it. Mostly the second gear fails. The bronze bushing I'm talking about happens to be
right next to the front sprocket. The width of the standard sprocket is allready 12mm (offset a couple of mm's). Any more will put extra stress on the bronze bushing and will eventually destroy your gearbox. Solutions with extra bearings are very costly and therefor not interesting for me.
As for option number 2 it depends how much the rear wheel needs to be 'excentered'. If I understand correctly we're talking about approx 6mm's or less. I think it could be less, because according to the photo's in this post there's a lot of space between tire and chain. My 851 has only 1 mm of space..!

It could even be possible that the wheel needs to be moved 3 or 4 mm to the right. This should not effect driving and it's much easier to accomplish then to create offset sprockets. A new bushing or a spacer on the rear axle at one side and sanding down the alu brakeholder on the other side. Could be done in a couple of hours (will cost you probably nothing)
Options three speaks for itself. Offset the front and rear sprocket with a few mm's and excenter the rear wheel with a couple of mm's. Maybe the best option. Problem is still an new front sprocket.
cheers! Léon