MenuMenuModern Bike

31.8 mm Bicycle Stems

Bar clamp diameter is the diamater of the handlebar.

SortSort

Showing 1060 products:

Ritchey Comp 4-Axis Stem - 60 mm, 31.8 Clamp, +30, 1 1/8", Alloy, Black
Ritchey Comp 4-Axis Stem - 60 mm, 31.8 Clamp, +30, 1 1/8", Alloy, BlackRitchey

Proven time after time to be a reliable, easily adjustable system that continues to outperform the competition, the 4-Axis stem is a sure fire go to for … read more

StarStarStarStarStar 5 of 5 ( 3 ) 5 of 5 stars average ( 3 reviews )

your price $44.95

BuyBuyPART NUM 960951
Origin8 Throwdown MTB Stem, 35x31.8x28.6, Black
Origin8 Throwdown MTB Stem, 35x31.8x28.6, Black

Ideal for Trail, Enduro, and Downhill MTB applications 3D forged and CNC machined AL6061-T6 alloy construction Lightweight, extra-wide … read more

15% offretail $52.99 your price $45.09 + ships free

BuyBuyPART NUM 238226
Ritchey Comp 4-Axis Stem - 110 mm, 31.8 Clamp, +30, 1 1/8", Alloy, Black
Ritchey Comp 4-Axis Stem - 110 mm, 31.8 Clamp, +30, 1 1/8", Alloy, BlackRitchey

Proven time after time to be a reliable, easily adjustable system that continues to outperform the competition, the 4-Axis stem is a sure fire go to for … read more

your price $44.95

BuyBuyPART NUM 917853
Whisky No.7 MTN Stem 50mm 31.8 0 Degree Black
Whisky No.7 MTN Stem 50mm 31.8 0 Degree BlackWhisky Parts Co.

No.7 Mountain stems offer a stout connection for modern mountain bars. They match the simple aesthetic of other Whisky cockpit components.  3D-forged … read more

your price $45.00 + ships free

BuyBuyPART NUM 816099
Thomson X4 Stem Mountain 31.8 60mm 90 Degrees Black 1-1/8" Threadless
Thomson X4 Stem Mountain 31.8 60mm 90 Degrees Black 1-1/8" ThreadlessThomson

Thomson X4 Mountain Stems feature smooth edges for carbon bar compatibility and use bolts that are custom heat treated with corrosion preventative plating. … read more

StarStarStarStarStar 4 of 5 ( 2 ) 4 of 5 stars average ( 2 reviews )

$14 offretail $114.95 your price $99.99 + ships free

BuyBuyPART NUM 327291
Paul Component Engineering Boxcar Stem, 70mm +/- 15 degree 31.8mm 1-1/8" Threadless Black
Paul Component Engineering Boxcar Stem, 70mm +/- 15 degree 31.8mm 1-1/8" Threadless Black

Paul Component Engineering Boxcar Stem, 70mm +/- 15 degree 31.8mm 1-1/8" Threadless Black Item Specifications Color: Black Weight: 155 Length: 70 … read more

your price $147.50 + ships free

BuyBuyPART NUM 789584
Easton Cycling EA70 Threadless Stem, 31.8 x 50mm, 1-1/8', +/-7d, Black
Easton Cycling EA70 Threadless Stem, 31.8 x 50mm, 1-1/8', +/-7d, Black

Light, fast and good looking 3D forged EA70 aluminium and DST faceplate with Top-Lock technology Clamp diameter: 31.8mm Weight: … read more

your price $69.99

BuyBuyPART NUM 188404
FSA V-Drive Stem - 80mm 31.8mm +/- 6 Degree Alloy Black
FSA V-Drive Stem - 80mm 31.8mm +/- 6 Degree Alloy BlackFull Speed Ahead

3D forged and CNC machined AL6061/T6 mountain bike stem. 4-bolt cold-forged alloy faceplate Chromoly hardware Item Specifications … read more

your price $37.00 + ships free

BuyBuyPART NUM 498028
Paul Components Boxcar Stem (31.8) 15d X 90mm - Silver
Paul Components Boxcar Stem (31.8) 15d X 90mm - Silver

The perfect combination of stiffness, strength, and reasonable weight Made with US sourced 2024 aircraft alloy All screws are high … read more

StarStarStarStarStar 5 of 5 ( 1 ) 5 of 5 stars ( 1 review )

your price $147.50 + ships free

BuyBuyPART NUM 337356
Ritchey WCS C220 Stem - 90mm, 31.8mm, -6 Degree, Aluminum, Matte Black
Ritchey WCS C220 Stem - 90mm, 31.8mm, -6 Degree, Aluminum, Matte BlackRitchey

The WCS C220 stem is easy to install and remove thanks to a press-fit handlebar clamp interface and forward-facing hardware. Bolt forces are aligned … read more

your price $99.95 + ships free

BuyBuyPART NUM 509818
Thomson X4 Mountain 31.8 100mm 90 Degrees Black 1-1/8" Threadless Stem
Thomson X4 Mountain 31.8 100mm 90 Degrees Black 1-1/8" Threadless StemThomson

Thomson X4 Mountain Stems feature smooth edges for carbon bar compatibility and use bolts that are custom heat treated with corrosion preventative plating. … read more

StarStarStarStarStar 4 of 5 ( 2 ) 4 of 5 stars average ( 2 reviews )

your price $114.95 + ships free

BuyBuyPART NUM 428098
Easton EA70 Stem - 120mm, 31.8mm, +/- 7 Degree, Alloy, Black
Easton EA70 Stem - 120mm, 31.8mm, +/- 7 Degree, Alloy, Black

Road race light, super stiff and MTB strong. The EA70 is available in many lengths and multiple drops/rises, guaranteeing a dialed-in fit for any performance … read more

your price $69.99 + ships free

BuyBuyPART NUM 559743
FSA NS ACR Stem, 31.8 x 80mm, -6d, Black
FSA NS ACR Stem, 31.8 x 80mm, -6d, BlackFull Speed Ahead

Road and gravel stem featuring FSA`s Aerodynamic Cable Routing (ACR) AL6061-T6 body and faceplate with chromoly hardware Compatible … read more

your price $124.00 + ships free

BuyBuyPART NUM 799462
Spank Spike Race 2 Stem, 31.8 x 50mm, 0d, Green
Spank Spike Race 2 Stem, 31.8 x 50mm, 0d, Green

2D forged MGR alloy is CNC weight optimized Chamfered bar clamps reduce stress risers in the critical bar/stem interface Shotpeen anodized … read more

your price $49.99

BuyBuyPART NUM 278227
Promax DA-1 Stem 120mm +/- 7 Degree 1-1/8 Threadless Blue
Promax DA-1 Stem 120mm +/- 7 Degree 1-1/8 Threadless Blue

The DA-1 XC mountain bike is 3D cold forged, then CNC machined from 6061-T6 aluminum to create a lightweight and strong stem. Item Specifications … read more

your price $36.00 + ships free

BuyBuyPART NUM 619124
Ritchey C-260 Superlogic Carbon Stem
Ritchey C-260 Superlogic Carbon StemRitchey

Ritchey Stems Matte UD carbon Stack: 42mm Item Specifications Color: Black Weight: 125g Intended Use: Road Bar Clamp Diameter: 31.8mm Stem … read more

your price $299.95 + ships free

ChooseChoose
Paul Components Boxcar Stem - 31.8 x 70mm,  Black
Paul Components Boxcar Stem - 31.8 x 70mm, Black

The perfect combination of stiffness and strength at a reasonable weight Made with US sourced 2024 aircraft alloy All screws are high … read more

your price $147.50 + ships free

BuyBuyPART NUM 437421
Zipp Service Course Stem, 31.8mm x 90mm, 1-1/8', 25 degree, Silver
Zipp Service Course Stem, 31.8mm x 90mm, 1-1/8', 25 degree, Silver

Increased stiffness-to-weight ratio 6061 alloy Steel hardware Bead Blast black finish Item Specifications … read more

your price $56.00 + ships free

BuyBuyPART NUM 748924
WHISKY No.7 Stem, 120mm, +/-6 degree, Silver
WHISKY No.7 Stem, 120mm, +/-6 degree, SilverWhisky Parts Co.

The No.7 is a lightweight stem with clean aesthetics. Stems only have a few jobs to do - hold the bars, provide stable support and look good. Available … read more

your price $45.00 + ships free

BuyBuyPART NUM 449305
Origin8 Everland MX/GX 40 degree Stem, 60x31.8, Black
Origin8 Everland MX/GX 40 degree Stem, 60x31.8, Black

High angle stems ideal for Monstercross or Gravel bikes equipped with off-road drop bars Raises drop bars eliminating the need for excessive … read more

15% offretail $43.99 your price $37.39 + ships free

BuyBuyPART NUM 687703
Ritchey

"Ritchey bicycle components have been raced to victory in some of the biggest cycling competitions in the world including the UCI World Championships, the Tour de France and the Olympics and it all began in a simple garage in Menlo Park, California with Tom Ritchey.'

See all Ritchey

Whisky Parts Co.

"Whisky Parts Co. makes high quality carbon components designed with unique features that help you do more with your bike and stand out from the rest. We believe that our work can help every rider find a new level of confidence and performance with our sturdy and lightweight forks, bars, rims and more. So whether you are building a new bike or upgrading one you already have, you'll find an uncommon attention to detail in every product we offer."

See all Whisky Parts Co.

Thomson

Thomson is leading with innovative design for two primary markets - aerospace and cycling.

See all Thomson

Full Speed Ahead

"We move forward with a desire to deliver the best possible components to our customers and a determined spirit of competition."

See all Full Speed Ahead

Dimension

Dimension makes quality components to repair or custom-fit the vast majority of bikes being ridden today, and provide the accessories that make them fun to ride.

See all Dimension

Salsa

"At Salsa, we believe a sense of adventure makes life better. The bicycle can be so much more than just a bike; it's a path to new places, new people, and amazing experiences."

See all Salsa

Kind Shock

Kind Shock is an industry leader in suspension and dropper seat posts.

See all Kind Shock

Industry Nine

"Industry Nine hubs are handmade in Asheville, NC"

See all Industry Nine

Syntace

"Strong. Light. Smart."

See all Syntace

Sunlite

"Every year bikes change, styles and trends evolve, old bikes are in need of repairs and new bikes are waiting for that personal touch. We provide the means to keep your bike on the road and fun to ride!"

See all Sunlite

fizik

fi'zi:k is a racing brand. It represents beauty, speed, passion, freedom for those who race against each other, race against the clock and for enthusiast cyclists around the world who identify with the feeling of the fire of competition.

See all fizik

Atomlab

"Built for Race"

See all Atomlab

We define color as the main color of the item. It may have accents or highlights in other colors.

In Store products are available to view in our showroom. In Store orders usually ship the same or next business day.

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 angles are measured perpendicular to the clamp. For example, a 90 degree stem is straight. Sometimes, this may also be refered to as a 0 degree stem. If two measurements are listed, the stem can be flipped for angling up or down.

Stem Type

This is the part number or identifier for this item from the manufacturer

Our Lowest Price - This product is ineligible for additional discounts or rebates.

Buy this product and your entire order ships for free.

Some orders are inelligible for delivery discounts. See offer details for disqualifying products and destinations.