What is the largest front wheel I can put on my Harley Bagger (Touring model) without doing any modifications? The 21" X 3.25" wheel is the largest front motorcycle wheel you can install on your Harley Bagger without having to modify the rake and trail of the bike. No triple tree is necessary and you will be able to use your stock fender. For 2000-2013 Harley Davidson Touring models,...