Swapping out stock for custom motorcycle handlebars can be one of the most visible changes you can make to the look and stance of your motorcycle, as well as your riding position. For more information you can check out the Motorcycle Handlebars 101: Handlebars, Grips & Riser Info Tech Tip. Motorcycle handlebars are available in two sizes which refer to the outside diameter of the handlebar tubing. 1 inch handlebars are found on Harley-Davidson Big Twins and Sportsters as well as many late-model cruiser-style motorcycles. 7/8 inch handlebars are found stock on many vintage motorcycles including Triumph, BSA, Norton, Yamaha, Honda and Suzuki, among others. Another option you will see is smooth versus dimpled handlebars. Dimples are the 2 inch long indentations on the underside of each handlebar end. They allow for the wire clusters on stock Harley-Davidson electrical switches (typically part of your handlebar controls) to rest inside the dimples, which are held in place by the clamps on stock H-D brake and clutch levers. If you are running stock H-D switches and hand controls you want to go with dimpled handlebars. Smooth handlebars can be run on any motorcycle, stock, bobber, chopper or the like, and are the right choice if you want to cut down and narrow your handlebars. Smooth bars are great for custom bikes, or if your bike has no front brakes, no stock bar-mounted electrical switches, or a custom control setup, such as KustomTech levers and throttle. Another handlebar term that some people confuse with dimples is knurling. Knurling is a machined finish of angled lines that gives some grip to the clamping area at the center handlebar riser area of some bars, typically taller ones. This keeps the handlebars more secure when the risers are tightened.