However, 18's just look better
In spoked I'd say yes, but with reverse comstars I kind of like the difference of having the 16 in the rear, I also think it holds a wider tire.
Going slightly off topic, maybe - anyhow...
I´m going the other way around with one of my -81 standard models.
I´ve prepped that one for a serious trip abroad with m´lady in the future (next summer???). As a 130 / 90 x 16 rear can carry a higher load than the 4.00 x 18 that´s on as original, I put a 16-incher on that one to test. It´s revving a tad higher, which may even be a good thing once fully loaded. Maybe I´ll do a 650 clutch gear swap - the parts are on another of my bikes, right now.
The bike stands there in the garage with a triple bypass done only 50 kms back. KONI rear shocks to handle the unevitable overload, progressive front fork springs are in there since before, a TAROZZI fork brace will go on before we go. A new rear tire will be on too.
A standard model 500 is only allowed to carry 170 kg or so. I know our weights already and together with what we´ll be needing, luggagewise, there´ll be at least 70 kg more than what´s allowed.
The bike can handle it (did a similar trip with my son, riding pillion (similar weight) 7-8 years ago). Rough eastern-European roads - no problems, not one single bottoming out - but at speed on German Autobahn I wasn´t so confident - the rear ran rather hot, being seriously overloaded. I´m sure the 16-incher will add some margin..
Sture