I don't have any experience with them on a touring bike but do on a Softail (FXSTI). The Softail will obviously handle different due to the rake angle but I really think the 21" front wheel is a much larger gyro. The effect on the bike is that it really likes to stand right up after a corner more so than my Ultra. Again, a lot of this is due to the different steering geometry between the two bikes but that 21" wheel has just got to have a more pronounced gyro effect on the bike. I'd be interested in hearing the results so post back if you actually do it.Rocket Jockey said:Does anyone have any experience with 18" and/or 21" (front) wheels and tires on a Road Glide or Electra Glide, Road King. I am curious about how the ride and handling changes. Pics would be good too!!