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GENERATION NEXT

机译：下一代

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Surprise! BMW's dirtbike is here. Who would have thought five years ago that BMW would be building a full-on, race-ready 450cc enduro? Not us. The reason behind this madness? BMW wants to diversify, to hit a new performance-driven market segment, to basically captivate and snap up a younger clientele. The Germans have produced, and the G450X is set for a fall release in the U.S. BMW has never been a company to follow traditional concepts. At least not the traditional concepts of others! So even though this new 450cc machine is a dramatic departure from the company's more usual touring fare, the engineers also didn't play it safe by simply copying current dirtbike designs. In fact, one look at the G450X shows you how unconventional it is. On the outside, the frame is a bridge-type unit constructed of stainless-steel tubing and sideplates. Note how the tubes go around the sides of the engine and also how far forward the swingarm pivot is located. While this makes for a long aluminum swingarm that fits into a fairly standard 58.1-inch wheelbase, the real trick here is the concentric mounting of its pivot with the countershaft sprocket. In addition to the extra length, this also allows chain tension to remain constant throughout the suspension's stroke.
机译：惊喜！宝马的越野摩托车就在这里。五年前，谁曾想到宝马会制造一款全面的，可用于比赛的450cc耐力赛？不是我们。这种疯狂背后的原因？宝马希望实现多元化，打入以性能为导向的新细分市场，从而基本吸引并吸引年轻客户。德国人已经生产了，而G450X计划在美国秋季发布。宝马从未像今天这样遵循传统概念的公司。至少不是别人的传统观念！因此，即使这台新的450cc机器与该公司通常的旅行费用大相径庭，工程师们也不能仅仅通过复制当前的越野摩托车设计来保证其安全性。实际上，对G450X的一看便可以看出它是多么的非常规。在外部，框架是由不锈钢管和侧板构成的桥式单元。请注意管子如何绕过发动机的侧面，以及后摇臂枢轴位于多远。虽然这可以使长铝制后摇臂适合相当标准的58.1英寸轴距，但真正的窍门是将其枢轴与副轴链轮同心安装。除了额外的长度，这还使链条张力在整个悬架行程中保持恒定。

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