Note that without a great understanding of how a conventional motorcycle transmission works, this video may not do a very satisfying job of relaying the points of difference. Here’s a very old Engineering Explained video delving into the mechanicals behind this style of transmission. In both cases, though, clutch actuation is handled by the bike. These are usually implemented in such a way that different gears are totally selected by the motorcycle, or optionally shifted by the rider - there’s usually a choice available. where do they keep the wheelies? Honda image. Because a DCT trans is basically two separate transmissions, the next gear can be “preselected,” allowing for lightning-fast gear changes. In a traditional transmission, only one gear ratio at a time can be selected. The alternating-gears-on-the-shafts point is a pretty important concept, because it removes the drawback of the conventional manual, which is its constantly meshed gears. The shafts usually run concentrically, to save space, as do the clutches. The transmission’s gears are split onto two shafts - odd-numbered gears are on one, and evens are on the other. #Automatic motorcycle manual#It is actually really similar to a conventional manual transmission.Ī DCT is basically two manual transmissions with two separate clutches housed in one box, but controlled by one shift drum. What's this DCT transmission I hear about?ĭCT stands for “dual clutch transmission.” A DCT as used in most modern self-shifting motorcycles. One clutch, two clutch, red clutch, blue clutch. It depends on the system!) Here’s a quick primer on current self-shifting motorcycles. (I mean that the bike’s drive ratios change with little or no rider input - or they may not. Most successful designs are of fairly recent vintage, and even though many are described as “automatic” based on their method of operation, their function may or may not be transparent to the user. This distinction is important, because the self-shifters in the two-wheel world operate differently in a mechanical sense. Traditionally, in the automotive world, that term has described a hydraulic planetary automatic transmission, a very specific type of tranny that hasn’t been adapted to a motorcycle on a major scale, likely for a few reasons, most involving size and (lack of) return on investment of adaptation costs. So let’s take a closer look at motorcycles that don’t require the rider to handle the gear changes. Just look at the fuss (500-plus comments!) Andy created when he wondered if motorcycles with automatic transmissions would bring in new riders. It would kind of stand to reason, then, that there should be some self-shiftin’ motorcycles available for sale here, right? In reality, there aren't that many and it's a topic that stirs up a lot of opinions. The manual transmission is nearly dead and gone in cars in America. You don’t have to shift gears if you don’t want to.
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