I have been through the threads and online resources and I am now totally confused by the various tire sizing and the lack of 16 inch tire sizes available, especially for budget-minded folks. I came across some enduro style tires that are 90/100-16 and one reference i found said that they would be the equivalent. Would this tire fit without to much jerking around? I have a 1980 400G that has 120/90/16 rear and 3.00x18 front on it now.