No clearance issues with the 19" rim, or fitting to do, when matched with a Avon Roadrider 90/90/19. Just another option is all...... You could continue to use a lower profile front tire if you like, for some great handling street use, with the benefits of a 19" wheel. Also you can retain the stock rear tire. There may also be a wider selection of 19" front tires, then 18" .... BUT, if your gonna do any gravel or off road stuff, or a combination of all... I think r80rt hit the nail on the head with those K70 tires.