31.8 mm Bicycle Stems
Bar clamp diameter is the diamater of the handlebar.
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Showing 1069 products:
Cirrus Cycles Kinekt Suspension Stem - 100, 31.8 Clamp, +30, 1-1/8", Alloy, Black 
BuyPART NUM 631002
The Kinekt Suspension Stem is designed to reduce arm, wrist, and shoulder discomfort. Adjustable, Compact, and built to last. Significantly reduces … read more
In Store
Cirrus Cycles ST100HR
Ships Freeyour price $189.95 + ships free
BuyPART NUM 631002 
Renthal Duo Stem: 50mm 100d AluGold/Black 31.8
4 of 5
( 2 )
4 of 5 stars average
( 2 reviews )
BuyPART NUM 235686
CNC machined from 6082 T6 aluminium alloy U-shape cradle clamp eliminates handlebar stress risers found with traditional stems Made in Cheshire … read more
4 of 5
( 2 )
4 of 5 stars average
( 2 reviews )
popularyour price $132.95 + ships free
BuyPART NUM 235686 
Ridefarr Farr-ST Supa-X BMX Stem 1-1/8" (31.8) 55mm, Black BuyPART NUM 511954
Offers a -5mm drop for lowering the front-end to help ensure maximum power and efficiency Forged and CNC machined from 6061-T6 alloy … read more
Three remaining at this priceyour price $89.00 + ships free
BuyPART NUM 511954 
Paul Components Boxcar Stem, (31.8) 12d X 100mm - Purple BuyPART NUM 731877
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
BuyPART NUM 731877 
Soma Shotwell Stem (31.8) 83/7 X 100mm Silver BuyPART NUM 422025
3-D forged aluminum with 4-bolt bar clamp 83 or 7 degree flip flop design. 137g (80mm) Includes shim for 1" threadless steerers … read more
your price $44.99 + ships free
BuyPART NUM 422025 
Thomson X4 Mountain 31.8 130mm 90 Degrees Black 1-1/8" Threadless Stem
4 of 5
( 2 )
4 of 5 stars average
( 2 reviews )
BuyPART NUM 724444
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
4 of 5
( 2 )
4 of 5 stars average
( 2 reviews )
your price $114.95 + ships free
BuyPART NUM 724444 
FSA K-Force OS-99 Carbon Stem 31.8x90mm
BuyPART NUM 159864
FSA (Full Speed Ahead) K-Force Light OS-99 Stems 3D forged and CNC machined from AL-2014 UD carbon weave skin applied through CSI process … read more
your price $186.20 + ships free
BuyPART NUM 159864 
Hope XC Stem - 70mm, 31.8 Clamp, +/-0, 1-1/8", Red BuyPART NUM 639939
Hope XC stem is optimised for the perfect balance of weight and stiffness. Gone are the days that XC meant noodly handling. Our new stem is designed … read more
your price $120.00 + ships free
BuyPART NUM 639939 
Deity Copperhead 50mm 31.8 Stem Orange BuyPART NUM 661200
Even lighter than the Cavity stem Machined from 6061 T6 aluminum Short 30mm stack height and 55mm wide faceplate for increased stiffness … read more
your price $104.99 + ships free
BuyPART NUM 661200 
Ritchey Comp 4-Axis Stem - 110 mm, 31.8 Clamp, +/-6, 1 1/8", Alloy, Black
BuyPART NUM 742604
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 $52.95 + ships free
BuyPART NUM 742604 
Promax Gent 31.8mm Stem, Length 90mm, 1-1/8" Threadless Black BuyPART NUM 882930
Promax Gent Stem Item Specifications Bar Clamp Diameter (mm): 31.8 Color: Black Length: 90 Material: Aluminum S.H.I.S. Stem Clamp Diameter: 28.6 … read more
your price $31.99 + ships free
BuyPART NUM 882930 
Promax Gent 31.8mm Stem, Length 45mm, 1-1/8" Threadless Black BuyPART NUM 425732
Promax Gent Stem Item Specifications Bar Clamp Diameter (mm): 31.8 Color: Black Length: 45 Material: Aluminum S.H.I.S. Stem Clamp Diameter: 28.6 … read more
your price $31.99 + ships free
BuyPART NUM 425732 
Profile Design Aris Stem: 70MM; 65/115degree; Black; 1-1/8"; 31.8 BuyPART NUM 448740
Profile Design Aris Stems. Available for 26.0 & 31.8 3D forged 6061-T6 Aluminum Item Specifications Color: Black Intended Use: Road Steerer Tube: … read more
your price $42.00 + ships free
BuyPART NUM 448740 
RaceFace Atlas Stem Black 65mm x 31.8 BuyPART NUM 961881
RaceFace Atlas Stems Intended use is All Mountain, Freeride and Downhill 4-bolt bar clamp with interlocking u-shaped faceplate Opposing bolts on … read more
15% offretail $99.99 your price $84.99 + ships free
BuyPART NUM 961881 
Ritchey WCS C220 Stem - 120mm, 31.8mm, -6 Degree, Aluminum, Matte Black BuyPART NUM 376377
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 $109.95 + ships free
BuyPART NUM 376377 
Box One Front Load Stem, 48mm x 31.8mm x 28.6mm, Black BuyPART NUM 697072
Traditional front loading style BMX stems with a 31.8mm clamp, compatible with MTB and oversized BMX handlebars Constructed from 6061-T6 … read more
your price $69.99 + ships free
BuyPART NUM 697072 
FSA Afterburner Stem, (31.8) 78/12d X 70mm - Black BuyPART NUM 981412
3D forged, CNC machined 6061 aluminum CrMo hardware. 4-bolt alloy faceplate. 2-bolt steerer clamp Two tone black graphics on ±12 deg … read more
your price $80.00 + ships free
BuyPART NUM 981412 
Spank Spike Race 2 Stem, 31.8 x 50mm, 0d, Green BuyPART NUM 278227
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 $45.99 + ships free
BuyPART NUM 278227 
Zipp Service Course Stem, 31.8mm x 60mm, 1-1/8', 6 degree, Silver BuyPART NUM 708168
Increased stiffness-to-weight ratio 6061 alloy Steel hardware Bead Blast black finish Item Specifications … read more
your price $56.00 + ships free
BuyPART NUM 708168 
Zipp Service Course Stem, 31.8mm x 130mm, 1-1/8', 6 degree, Silver BuyPART NUM 195773
Increased stiffness-to-weight ratio 6061 alloy Steel hardware Bead Blast black finish Item Specifications … read more
your price $56.00 + ships free
BuyPART NUM 195773 
Thomson is leading with innovative design for two primary markets - aerospace and cycling.
"We move forward with a desire to deliver the best possible components to our customers and a determined spirit of competition."
"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.'
"The world's best choose Cane Creek. A key element of Cane Creek's mission is to support the sport of cycling, including racing, charitable activities and cycling advocacy. Cane Creek believes strongly in the power of bicycles and their potential to effect positive change in our society. To that end, Cane Creek supports athletes and teams whose purpose encompasses more than competitive racing, such as getting more people on bikes, improving or promoting a healthy lifestyle, and making our world better through the use of a bike."
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.
"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."
"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."
"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!"
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
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