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Reverse components

Reverse Components Black ONE D-2 31.8 mm stem

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Features of Reverse components Black ONE D-2 31.8 mm

Product description of Reverse Components Black ONE D-2 31.8 mm stem

Description summary

One stem, two standards. The Reverse Components Black One D-2 offers unmatched versatility, seamlessly fitting both Ø31.8mm and Ø35mm handlebars with its included reducer shim. This future-proof design is ideal for riders with multiple bars or those planning an upgrade. Its intelligent no-gap bottom clamp provides a smooth, wide contact area, ensuring even pressure and protecting carbon bars from stress. Crafted from durable 6061 T6 aluminum, this 35mm stem delivers exceptional stability and extends the life of your handlebar

Product information Black-One D-2 35mm Ø31,8 & Ø35mm

1 Stem, 2 handlebar diameters. The Black One D-2 stem builds on the success of our flagship Black One Enduro stem and brings in the ability to run both Ø31.8mm and Ø35mm handlebars with one stem.
The special designed shim allows the use of Ø31.8mm bars and when removed, it works as an Ø35mm stem. The shim provides a wide, smooth clamping area which is ideal for use with carbon bars.

The intelligent no-gap clamping design in the bottom ensure no pinch points, and equal clamping force for safety and stability. Because the most loads and notching effects are always at the bottom of the handlebar. And our smooth no-gap surface enlarges the lifetime of your handlebars.

The Black One D-2 is ideal for riders who have a few sets of Ø31.8mm/35mm bars with different rises and want to continue using them all, or who may want to upgrade to a 35mm bar in the future, without having to buy another stem. Available in 35mm lengths in Black matt finishes.


We also offer an extra light Black One D-2 TITANIUM version of this stem with understated Black or Polished finishes, with full Titanium bolts.

Features:
- Length: 35 mm
- Clamping diameter: Ø 31.8 mm & Ø 35.0 mm
- Angle: 8°
- Stack height: 40 mm
- Clamping platform: 50 mm
- Ø head tube: 1 1/8
- Weight: 152g (+/- 5% weight tolerance)
- Material: Aluminium 6061 T6

Extras:
- Reducer Shim
- Top Cap with screw & claw
- Micro adjustment lines: for better orientation in the alignment of the handlebar

Specifications

Manual

Technical specifications of Reverse components Black ONE D-2 31.8 mm

Features of Reverse components Black ONE D-2 31.8 mm

Color Black

Color

Black

Recommended Use MTB Cycling

Recommended Use

MTB Cycling

Materials Aluminum

Materials

Aluminum

Key differentiators

Constructed from durable 6061 T6 aluminum for reliable performance in MTB cycling.

Dual handlebar compatibility with an included reducer shim for both Ø 31.8 mm and Ø 35.0 mm diameters.

Features micro-adjustment lines for precise handlebar alignment.

Intelligent no-gap bottom clamping design for even pressure distribution, ideal for carbon handlebars.

Technology in Reverse Components Black ONE D-2 31.8 mm stem

Energy rating

Warnings

5 / 5

6 Reviews

What our customers are saying about Reverse Components Black ONE D-2 31.8 mm stem

This handlebar stem features excellent build quality, praised for being light, durable, and functional. Its standout feature is a clever adapter, ensuring a perfect fit for both 31.8mm and 35mm handlebars. The beautiful, clever design allows for tilt adjustment and comes as a complete kit with a top cap and anchor. The only noted weakness is a top cap bolt that can be prone to stripping

Reverse Components Black ONE D-2 31.8 mm stem

Nice stem

2025/05/09

Vlad

Stem is nice and light, can fit both 31.8mm and 35mm clamps using a adapter. I´d recommend changing the top cap bolt thought as they tend to easily get rounded or stripped, overall it´s alright

Reverse Components Black ONE D-2 31.8 mm stem

Well built, quality product

2025/03/31

kieung kim

clever design excellent build quality would buy again

Reverse Components Black ONE D-2 31.8 mm stem

2 in 1 very practical

2022/12/28

Moana

The spacer allowing to pass from a diameter 31.8mm to 35mm is very useful. the design isn't bad either. I recommend.

Reverse Components Black ONE D-2 31.8 mm stem

Reverse Component Stem

2022/08/30

Kenn

Fits well with Renthal Fatbar on my Giant Bike. Nice graphic design, Light and durable. Nice product from Reverse Components. Highly recommended stem.

Reverse Components Black ONE D-2 31.8 mm stem

Reverse stem

2022/02/06

Andrey

The handlebar stem is well made, I really liked the fact that there is an adapter for different handlebar diameters in the kit, there is also a topcap and an anchor for installation in the fork stem, there is also a plus for adjusting the steering wheel tilt, I am very satisfied with the purchase, thanks to the bikeinn store.

Reverse Components Black ONE D-2 31.8 mm stem

Opinion.

2022/01/22

Denis

Excellent thing. Beautiful, durable and functional.

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Include AI Generated questions and answers

2026-10-27

Generated by AI and verified

Reverse Components Black ONE D-2 31.8 mm stem

What is the main advantage of the Reverse Components Black One D-2 stem?

Answer of Generated by AI and verified

The primary advantage of this stem is its versatility. It is designed to be compatible with both Ø 31.8 mm and Ø 35.0 mm handlebars thanks to an included reducer shim, making it a flexible choice for riders who use different bars or plan future upgrades.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black ONE D-2 31.8 mm stem

What material is the Black One D-2 stem made from?

Answer of Generated by AI and verified

The Reverse Components Black One D-2 stem is constructed from durable aluminum to provide stability for MTB cycling.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black ONE D-2 31.8 mm stem

Is the Reverse Components Black One D-2 stem worth the investment for MTB cycling?

Answer of Generated by AI and verified

The Reverse Components Black One D-2 stem offers versatility and durability, making it a solid investment for MTB cycling users. Its ability to fit both Ø31.8mm and Ø35mm handlebars with the included reducer shim adds to its value.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black ONE D-2 31.8 mm stem

What are the key dimensions of the Black One D-2 stem?

Answer of Generated by AI and verified

This stem has a length of 35 mm, a stack height of 40 mm, and a clamping platform width of 50 mm.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black ONE D-2 31.8 mm stem

What is the finish of this bicycle stem?

Answer of Generated by AI and verified

This stem comes in a black matt finish.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black ONE D-2 31.8 mm stem

What is the clamping design of this stem?

Answer of Generated by AI and verified

It features an intelligent no-gap clamping design on the bottom, which provides a wide, smooth contact area. This helps to distribute clamping force evenly, which is particularly beneficial for protecting carbon handlebars.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black ONE D-2 31.8 mm stem

What is the stem length of the Reverse Components Black One D-2?

Answer of Generated by AI and verified

The stem length of the Reverse Components Black One D-2 is 35 mm.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black ONE D-2 31.8 mm stem

What type of riding is the Black One D-2 stem intended for?

Answer of Generated by AI and verified

This stem is recommended for MTB (Mountain Bike) cycling.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black ONE D-2 31.8 mm stem

Is this stem a good choice if I plan to upgrade my handlebars in the future?

Answer of Generated by AI and verified

Yes, its dual compatibility with both Ø 31.8 mm and Ø 35.0 mm handlebars makes it a versatile option that can accommodate future handlebar upgrades without needing to purchase a new stem.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black ONE D-2 31.8 mm stem

What handlebar diameters is the Black One D-2 stem compatible with?

Answer of Generated by AI and verified

This stem is compatible with both Ø 31.8 mm and Ø 35.0 mm handlebars. It includes a reducer shim to fit the smaller 31.8 mm diameter.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black ONE D-2 31.8 mm stem

Is this stem suitable for use with carbon handlebars?

Answer of Generated by AI and verified

Yes, the stem features a wide, smooth clamping platform and a no-gap design that ensures even pressure distribution, making it ideal for use with carbon handlebars as it helps prevent stress and damage.

* Generated by AI based on customer and product data

2026-10-27

Generated by AI and verified

Reverse Components Black ONE D-2 31.8 mm stem

How does the Reverse Components Black One D-2 stem compare to the Sixpack Racing Vertic 35 Mm Stem?

Answer of Generated by AI and verified

While the Reverse Components Black One D-2 stem offers compatibility with both Ø31.8mm and Ø35mm handlebars, the Sixpack Racing Vertic 35 Mm Stem does not provide specific compatibility details. This makes the Black One D-2 more versatile for riders with multiple handlebar sizes.

* Generated by AI based on customer and product data

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Frequently bought together
Best sellers

Use cases

Trail and All-Mountain Riding 90% Fit

The short 35 mm length provides quick, responsive steering ideal for navigating technical trails. Its robust aluminum construction and wide 50 mm clamping platform offer the stiffness and reliability needed for aggressive all-mountain terrain.

35 mm stem length,Aluminum material,50 mm clamping platform

Upgrading for Handlebar Compatibility 100% Fit

This stem is a versatile upgrade, as it accommodates both 31.8 mm and 35.0 mm handlebars thanks to the included reducer shim. This allows riders to switch handlebars in the future without needing a new stem, making it a solid, forward-looking investment.

Compatible with Ø 31.8 mm & Ø 35.0 mm clamps,Includes Reducer Shim

Fine-Tuning Cockpit Setup 80% Fit

The integrated micro adjustment lines allow for precise and repeatable handlebar alignment. This is perfect for committed riders who want to dial in their exact preferred riding position for optimal comfort and control on long rides.

Micro adjustment lines,40 mm stack height

General MTB Trail Use 90% Fit

As a dedicated MTB component, this stem provides a reliable and solid connection between your fork and handlebars. The aluminum construction offers a great balance of strength and weight for everyday trail riding and weekend adventures.

Recommended for MTB Cycling,Aluminum material

Best for

Ideal for Versatile MTB Setups

This stem offers exceptional versatility for MTB riders. It includes a reducer shim, allowing it to fit both standard Ø 31.8 mm and oversized Ø 35.0 mm handlebars. This makes it a solid, future-proof choice for those who might change their cockpit setup, providing reliable performance without needing to buy a new stem.

Based on: clamp_diameter: Ø 31.8 mm & Ø 35.0 mm, Included: Reducer Shim, Top Cap with screw & claw, Micro adjustment lines, Recommended use: MTB Cycling

Best for Precision Cockpit Tuning

Achieving the perfect riding position is easier with this stem. It features micro adjustment lines for precise and repeatable handlebar alignment. Combined with its wide 50 mm clamping platform for enhanced stiffness, it allows for meticulous tuning to gain more responsive and accurate steering on demanding MTB trails.

Based on: included: Reducer Shim, Top Cap with screw & claw, Micro adjustment lines, Clamping platform: 50 mm, Precision Steering Control

A Solid Upgrade for Trail and All-Mountain

As a reliable upgrade, this stem is built from durable aluminum with a wide 50 mm clamping platform for secure handling on varied terrain. The short 35 mm length promotes quick, responsive steering, ideal for trail riding, while the matte black finish adds a clean, modern look to your bike.

Based on: recommended_use: MTB Cycling, Material: aluminum, Stem length: 35 mm, Clamping platform: 50 mm, Color: black matt

Benefits

FunctionalFits Two Handlebar Standards with One Stem

This stem offers exceptional versatility by accommodating both Ø 31.8 mm and Ø 35.0 mm handlebars. Thanks to the included reducer shim, you can easily switch between different handlebar diameters, making it a flexible choice for your current or future bike setup.

Clamp diameter: Ø 31.8 mm & Ø 35.0 mm

Included: Reducer Shim

Top Cap with screw & claw

Micro adjustment lines

FunctionalProtects Your Handlebar from Stress

The intelligent no-gap bottom clamp design provides a smooth, wide contact area that distributes clamping force evenly. This feature is especially beneficial for carbon bars, as it helps prevent pinch points and stress, ultimately extending the life of your handlebar.

Clamping platform: 50 mm

Ideal buyer profiles

General buyers seeking a versatile MTB stem

This profile represents mountain bike riders looking for a durable and adaptable stem to upgrade or complete their bike build. They prioritize compatibility, precise steering, and easy installation for their MTB cycling needs.

The Reverse Components Black One D-2 stem is an excellent fit for these riders. It is made from aluminum and is specifically recommended for MTB cycling. Its key feature is the included reducer shim, which allows it to be used with both Ø 31.8 mm and Ø 35.0 mm handlebars, offering great versatility. The design also includes micro adjustment lines, aiding in precise setup for optimal steering control.

Competitive features

When selecting a new stem for your mountain bike, details like handlebar compatibility, material, and design are crucial. We're comparing the Reverse Components Black One D-2 31.8 mm Stem against several other models, including others from the Reverse Components lineup like the E-Black One D-2, as well as stems from Cannondale and Syncros. The primary focus will be on key features like clamp diameter versatility and construction.

Where it excels

Handlebar Compatibility: The standout feature of the Black One D-2 is its dual compatibility. It includes a reducer shim, allowing it to fit both Ø 31.8 mm and Ø 35.0 mm handlebars with a single stem, offering excellent versatility for current setups or future upgrades. Thoughtful Clamping Design: It features an intelligent no-gap bottom clamp design with a wide 50 mm platform. This provides a smooth, broad contact area that distributes pressure evenly, which is particularly beneficial for protecting carbon handlebars from stress. Durable Construction: Constructed from 6061 T6 aluminum, this stem is designed for the demands of MTB cycling, offering a solid and stable connection between your handlebars and steerer tube.

Consider alternatives if...

Verdict

The Reverse Components Black One D-2 stem is an excellent choice for its exceptional versatility. Its ability to accommodate both major modern handlebar standards (31.8 mm and 35.0 mm) makes it a future-proof investment. Combined with its durable aluminum construction and a clamp design that's considerate of carbon components, it offers a robust and adaptable solution for a wide range of MTB riders.

Specs comparison

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Materialaluminumaluminumaluminum-6061 Alloy
Stack Height40 mm40 mm40 mm40 mm40 mm
Clamp Diameter31.8, 35 mm31.8, 35 mm31.8, 35 mm31.8 mm31.8, 35 mm
Stem Length35 mm35 mm35 mm50 mm50 mm

Specs vs competitors

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Materialaluminumaluminumaluminumaluminumaluminumaluminum
Stack Height40 mm34 mm36 mm-40 mm38 mm
Clamp Diameter31.8, 35 mm31.8 mm31.7 mm31.8 mm31.8 mm35.0 mm
Stem Length35 mm-70 mm75, 90, 100, 110 mm90 mm35 mm
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