BESNIN 17 Degree Bike Stem, 31.8mm 60mm 70mm 90mm 110mm 130mm MTB Stem Mountain Bike Handlebar Stem for Bicycle, Road Bike, MTB, BMX, Cycling (Aluminum Alloy)

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Racers will want the longest, lowest stem they can get away with and still be in control. This stretched out position will be better for aerodynamics. Some prefer light weight while some will sacrifice low weight for strength and rigidity, especially so for larger riders and sprinters. Stems between 100-120mm of length are known as long stems and anything below 90mm is considered as short stems. Generally on a road bike stems tend not to be shorter than 90mm and longer than 130mm. An adjustable stem is worthwhile if you want to be as upright and comfortable as possible. However, the adjustability comes with added weight, and an extreme upright position is appropriate for short distances only. For those riding thirty minutes or more, a slightly bent body position is advantageous for muscle function and wind resistance. Cost of Stems

The standard size for most modern mountain and road bikes, with typical lengths of between 35mm and 80mm for MTB stems, 80mm and 100mm for gravel bikes and 90mm to 140mm for road bikes. 1 1/4in steerer, 31.8mm bar clamp Road cyclists have very different priorities to mountain bikers. Likewise competitive racers have different preferences to those who ride recreationally. Road

Stem length has a big impact on the overall fit and ride of your bike. David Caudery / Immediate Media

Mountain bike stems are typically around 50-80mm long, while road bike stems are longer, starting at around 80mm and extending to 120mm or longer as the frame size increases. Gravel bike stems typically sit somewhere between the two. When we talk about stem standards here, we’re primarily talking about compatibility with the streerer tube on your bike (measured in inches), but also the handlebar clamp (measured in millimetres). Simply put, a longer stem provides you a more stretched out and aggressive posture while shorter stems bring bars closer to the saddle and put you in a more comfortable position. Bike stems look like a standard equipment without any science to it, however, they are highly influential when it comes to comfort and control. The wrong stem length will not only make it difficult to reach for the handlebars, it will also destabilize the steering and affect body position on the bike.If you are an experienced racer, most likely you have been through a bike fit process and know the length of the stem you need.