If your bike has a threadless headset—and most new bikes do—chances are pretty good that the stem has a two- or four-bolt faceplate, rather than an old-style bore-and-binder-bolt clamp. This makes removing the bars much easier: you don’t have to strip off the brake lever and bar tape from one half of the bars (along with any bar-mounted shifter) first. You just unscrew the faceplate bolts and take the bars off. It’s that simple. But there’s a downside. If the bolts securing the faceplate loosen, or if the faceplate itself cracks, you can lose a vital connection to your bike without warning. In short, if your bike’s stem boasts a four-bolt faceplate, your life hangs by four threads.

The upshot? You should check this critical connection often. Make sure the bolts that secure the faceplate are tight. But not too tight. Too much torque can crack the faceplate or stem. OK. How tight is tight enough? Well, if you bought the stem and installed it yourself, there was probably a sheet of instructions in the package, and that sheet may well have specified the appropriate torque. Of course, not every cyclist has a torque wrench in her toolbox, and even if you’re one of the few who does, you may not have bothered to keep all the printed bits of paper that came with each component. So you’ll have to judge the proper torque by feel. This won’t be hard if you’re an old hand, but if you’re just starting out—or if you’ve any doubts in the matter—get an experienced mechanic to demonstrate. You’ll soon have the touch.

And don’t stop there. While you’re at it, check the clamp bolts securing the stem to the steerer tube, too, and eyeball the whole assembly—gooseneck, steerer clamp, and faceplate—for hairline cracks. Any crack, however small, requires immediate attention, and replacing the affected part is the only acceptable fix. Check your brakes, shifters, and bar tape (or grips), too. Nothing should be loose, but if it is, tighten it down before riding off. You have only three points of contact with your bike: seat, pedals, and bars. You can’t afford to lose any one of the three.

Let’s return to the faceplate for a minute. It’s not enough to get the torque right. Neatness also counts. The plate should fit squarely, with uniform gaps between faceplate and gooseneck. Any unevenness in torque or fit increases the likelihood of failure. Faceplates do crack, sometimes without warning. And a faceplant can easily follow.

Bicycles are great deceivers. They look simple. Everything (well, most everything) is out in the open, and maintenance is mostly a matter of cleaning, lubricating, and tightening whatever has worked loose. But don’t you be deceived. This simplicity is more apparent than real. In truth, a bike is a complex assemblage of interdependent moving parts, machined to close tolerances and requiring careful adjustment. Yet you can master it. And you should. When your life hangs by a thread—and it often does—it’s good to know you’ve just checked that all is as it should be. ‘Nuff said?

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