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An adjustable stem will allow you to dial in the best position on your bike, and then once you've done so, you can obtain the length and degree measurements that would correspond to a fixed position stem. While you could ride an adjustable stem forever, there are a few drawbacks. The first is that most adjustable stems are quite heavy, since there is a lot of beefy build in the joints which hinge to allow you try out so many different biking positions. You might even expect that some adjustable stems weigh in at twice a regular, fixed position stem. The other reason that most cyclist don't stick with an adjustable stem for too long is that they can flex quite a bit at the intersections, and these stem types can even creak or squeak over time. In a hard sprint, for example, a cyclist is actually pulling upward on the handlebars! For that reason, an adjustable stem won't suffice for bike racing conditions. So once you've figured out your ideal biking position by using an adjustable stem on your bicycle, then it's time to go ahead and buy a regular steel, aluminum or carbon stem. Some adjustable stems allow you to test over 45 degrees of height adjustment in either direction. As an example, the quality and features of the popular Ritchey Pro stem with angle adjustability are worth consideration. Precision 3-D net shaped forged shafts interconnect to each other with precision broached clamps. It is 6061 T-6 aluminum and weighs about 219 grams, which for an adjustable stem is a reasonable weight. The Ritchey Comp Adjustable Stem permits you over 45 degree of angle adjustment in its range of movement. The 3-D net shaped forged shaft is precision designed to interconnect with an exact machined clamp, which gives this adjustable stem proven strength and stiffness. The angle adjustment gives incremental settings so that you can set the exact angles which will lead to all-day riding comfort for you. Once you have the adjustable stem set just right, you can figure out the equivalent fixed stem angles and lengths. Achieving a comfortable bike riding position will often involve trying out different handlebar stems, moving the handlebars higher up or closer to the saddle, or both. Most road bikes use threaded forks and require a stem that slips inside of the fork's steerer tube. A quill stem will have a long bolt running down through it, connecting to a wedge at the bottom. Older bicycle stems used a conical "expander" nut, with a split quill that expands against the inside of the steering tube. Most bike stems have a "minimum insertion" mark that shows how high it may be raised and still be safe to bike, and this is true of adjustable stems as well. If you can see the minimum insertion mark, your stem is too high. Many comfort bikes come with pivoting stems with adjustable rise. These types of adjustable stems work fine if the rider wants to sit up as straight as possible, but they aren't appropriate for more committed cyclists. Stem height is an important variable in your bike setup. Stems are available in a wide range of angles for rise, reach and height. If you're not sure what angles your bike will require, getting an adjustable stem is an advisable way to dial in a good bike fit.