For these setups, we recommend running a rake kit. These wheels lift up the front of the bike enough that triple trees alone will not take care of the problem entirely. The 23” x 5.5” Bulldog Fatty share similar rolling diameters, as well. If you run a skinny 23” or a fat 21” you will need to replace the triple trees and add about 6 to 7 degrees of rake to your frame. The fat 21” tire is approximately the same rolling diameter as the skinny 23” wheel assembly. The Bulldog 21” is a fatter tire with a larger tire profile.
That same set of triple trees will work for the correction you need to make in order to run the 21” x 5.5” Bulldog series fat front tire. Some people swear by running a 23” wheel without changing anything, but this is extremely risky. If you choose a 23” wheel, you will need to change out the triple trees to bring the trail number back to a safe, rideable measurement. If you are riding a touring model Harley like a Road Glide, Street Glide or a Road King, you can run up to a 21” x 3.25” wheel in the front and you will not need to change anything aside from the location of the fender. This is one of the reasons you will need to adjust the rake. Your bike will not be very safe or much fun to ride in this state. When the trail number gets too high, it can make steering the bike feel heavy. Doing so will move the front axle higher, causing the rake angle line to move further away from the centerline below the axle. Now that you see how the trail measurement works, envision replacing the original front wheel with a bigger wheel. Installing a giant oversize front wheel commonly seen in custom baggers utilize rake kits to keep the trail closer to the 6” measurement. On the other hand, you will gain high-speed stability when traveling in straight lines such as you would on the highway. When leaning more toward the 6” side of the spec, you will lose a little bit of turning radius. However, you will lose some stability at high speeds. The smaller the number, the more nimble the handling at slow speeds. Typically, a factory motorcycle is set between 4” to 6”. This measurement is the most important with regard to driveability. The trail measurement is made from the steering head rake angle at the point it meets the ground back to the centerline of the axle. In the image above, you can see the acute angle of approximately 40 degrees as noted by the word “RAKE.” The trail measurement is taken from directly below the axle to the imaginary point where the steering head rake would touch the ground. Rake is a measurement in degrees that indicates the angle of the steering neck in relation to the ground. Changing the rake of the frame is one of them. You may be wondering, what rake will I need with a new size wheel? There are several considerations you need to keep in mind when you install a larger wheel on your Harley or motorcycle.
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