Ed, the 100/90/19 Roadrider works well on the Standard WM2 x 19 Rear wheel, however , I did find it is overloaded when riding two up with luggage, unless the riders are very tiny people and the luggage is very light.
It comes with a 57 load rating, which I recall is about 540 pounds. With our Rapide loaded and two of us on it,the rear wheel has over 700 pounds load, that is why I finally switched to WM3 rims and the 4.00 x 18 rear . The 400 x 18 has a 64 v rating, still not adequate, but closer to the mark.
The other benefit with the larger profile tire is increased tire mileage and a little nicer ride. As compared to the stock skinny tires, the bigger profile front and rear take a tiny bit of additional effort to initiate turns, but the rider adjusts to that quickly.
It comes with a 57 load rating, which I recall is about 540 pounds. With our Rapide loaded and two of us on it,the rear wheel has over 700 pounds load, that is why I finally switched to WM3 rims and the 4.00 x 18 rear . The 400 x 18 has a 64 v rating, still not adequate, but closer to the mark.
The other benefit with the larger profile tire is increased tire mileage and a little nicer ride. As compared to the stock skinny tires, the bigger profile front and rear take a tiny bit of additional effort to initiate turns, but the rider adjusts to that quickly.