What is the difference between Harley aftermarket parts that are created using casting or one that is a billet part? Are there any major differences at all?
The answer is, there are differences, major differences, not only in the types of material that are being used in the process, but in the finished product themselves. From the strength, to the look, the wear and to the purchase price; there are a number of differences between billet and casting, especially in the grab-you–by-the-throat, thigh-rattling world of Harley aftermarket parts.
The Quality Cup: Who Wins?
In this corner, the billet process: First, it is a much more hands-on process requiring a lot more time and attention to detail than just running a cast. Because of the way that the billet process is completed, the piece is stronger, more durable and in many cases can be far more ornate than the more standard, run-of-the-mill cast item. In the ring marked for quality billet wins, hands down.
Which one stands the test of time?
A billet processed part is far more durable than a cast piece, particularly in certain types of material. When a material is used for casting it is put into a mold, either by pouring or by injection. The very process that is used to create it can add inherent flaws that can result in weak spots or outright damage. It can be damaged further when it is pulled from the mold. After the un-molding process, the item is usually sent to be chromed. However, if the molding process left it rough and uneven, it will have to be sanded and smoothed, which can result in even further damage. For the parts that need to be the strongest, like the axle for instance, you almost have to go with billet. Other parts are perfectly fine to be cast, however, you will probably end up replacing them at least once or twice during the life of your bike.
Knocked off Parts
Imported Harley aftermarket parts are almost always going to be cast, even if they use the term “billet” in the title or description that they give. If you don’t read exactly what you are getting or you don’t buy your Harley aftermarket parts from places that you know and trust, you are not going to get what you are paying for, namely solid and well-made parts that will stand the test of time without failing when you need them most.