ENVE Road 31.8 Aero Stem - black

The ENVE Aero Road Stem is designed to make you faster through aero shaping and optimisation of bike position to give a speed boost up to 30W.

This stem has been designed for road racers, triathletes, and performance-focused riders looking to improve overall aerodynamics while maintaining the stiffness, comfort and class-leading ride feel needed for prolonged day-in, day-out speed.

Developed with input from Team Dimension Data, ENVE's ultra-adjustable design uses two steerer clamp shims to tune the bar height by switching the angle between -7 and -17° with a fixed length or to tune the length by +/-2.5mm with a fixed -12.5° angle. This enables fine-tuning of your bike fit, allowing you to comfortably adopt a more aerodynamic position while also reducing the need for headset spacers to create cleaner airflow.

Technologies of the ENVE Road Aero stem

The aerodynamic design of the stem's shape was carried out in CFD (computational fluid dynamics) software by Smart Aero Technology and then honed at the Mercedes-AMG Petronas F1 wind tunnel. The testing results revealed a valuable 0.6W average gains across a full sweep of wind angles at 40kph compared to the ENVE Road Stem. Adding the stem to its natural partner, the ENVE SES Aero Road Handlebar, saves another 5W. As riders make up 80 to 90% of total drag, the biggest savings come back to the fit. With rider positions optimised using the shims commonly seeing gains of 15-30W. To avoid ruining the aerodynamic profile through bike computer positioning, ENVE has created a Garmin/Wahoo mount specific to this stem (sold separately). The stem is beautifully constructed in uni-directional carbon fibre, giving incredible strength, an ultra-sleek shape, additional comfort and weight savings. The aluminium clamp gives a strong, reliable grip while the stem also comes with a matching top cap.

Details of the ENVE Road 31.8 Aero stem

• Unidirectional carbon fiber construction

• Tested and raced by Team Dimension Data

• Wind-tunnel tested aerodynamic profile

• Length-offset shim for +/-2.5mm

• Angle-offset shim for -17° or -7° drop, -12° fixed

• Compatible with ENVE Aero Road Stem Computer Mount

This stem is intended for negative drop only and cannot be used flipped or reversed to create a positive rise.

• Material Carbon
• Length 100, 110, 120, 130, 140 mm (+/- 2.5 mm with 12° adapter)
• Weight 170, 175, 180, 185, 190 g
• Inclination -12° fixed; -17° to -7°with adapter
• Ø handlebar clamping 31,8 mm
• Ø steerer clamp 1 1/8" (28.6 mm)
• Material front plate: aluminium
• Material screws: titanium
• Stem height 42.5 mm with length adapter/ 45.5 mm with angle adapter