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The new 31.8 Impact stem has a 45-degree top-load design for BMX racing and freestyle. Available in 48-, 53- and 60-millimeter extensions, the stems are cold forged from the highest quality 6061-T6 aluminum then CNC machined to refine the shape and further reduce weight.
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These models are available for online purchasing and can be shipped directly to you.
Bar clamp diameter is the diamater of the handlebar.
Stem length is measured from the center of one clamp to the center of the other clamp. This measurement is sometimes known as the reach or extension.
S.H.I.S clamp diameter is the steerer tube diameter.
Stem Type
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Promax Impact 48mm Top Load Stem for 31.8mm Bars Blue
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Stem Measurements
