Customize Your Harley Davidson Front End with a Set of Our Triple Chrome Plated Triple Tree's. Browse this section thoroughly as there are many different triple tree configurations for early Big Twin & Sportster in both steel and chrome plated billet Aluminum. Sizes range from 35mm up to newer Harley's 49mm. If you are building a custom chopper or modifying a stock bike to radical, please look at the Billet Aluminum Raked Tree Set's, as these will drastically change the stance of your bike from the rest in the pack.