Road Bike Handlebar Stem Length

Proper positioning on the bike.

Road bike handlebar stem length.

Measured vertically from the center of the handlebar clamp to an imaginary line that bisects the central meeting point of the extension and vertical portion of the stem. Stem length will vary with the design of the bike. However most stems are not marked and must be measured in order to determine size. The most important consideration when choosing a road stem is the stem length considered as a key factor in the overall fit of the bike.

If the stem length is correct the handlebars should completely hide the front hub. It must also address the rider s comfort biomechanics performance needs and the steering and handling of the bike. The effective height gained as a function of the stem s angle and length. Comfort should be your guide when adjusting the height of the handlebars.

As a rule of thumb on a road bike you shouldn t run a stem much shorter than 90mm or much longer than 130mm. Competitive racers will opt for a longer 120mm stem for optimum stretch. Stems help you achieve a proper bicycle fit. If you can see the hub in front of the handlebar the stem is too short.

This less than 90 degree angle applies to road bikes touring bikes and indoor bikes. Assuming you have a handlebar you want to marry you can use stem length to keep reach within proper fit guidelines for your type of riding but that won t do much for drop without also affecting the height of the top and hoods. If you need a stem length beyond those extremes your bike frame is the wrong size. For non racers of many disciplines the top of the bars may be even with the saddle or even higher.

The overall length of the vertical portion of the stem. The rise angle of stem from fork to bar has quite a large effect. Mountain and road bike stems are available in different lengths and rises to suit the needs of any rider. One good rule of thumb for choosing the correct length stem and it works for the road cc team is to sit on the bike with your hands on the top of the hoods and look down at the front hub.

The road bike racer typically has the top of the handlebars below the seat height. Stem length is one aspect of a road bike that you can alter to increase both comfort and performance. Stem length designated in millimeters may be indicated on the stem.