31.8 mm 40 mm Bicycle Stems
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.
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Showing 34 products:
Whisky No.7 MTN Stem 40mm 31.8 0 Degree Black
BuyPART NUM 601487
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
Lowest Price
Ships Freeyour price $48.00 + ships free
BuyPART NUM 601487 
TruVativ Hussefelt Stem 40mm 0deg 31.8 1-1/8 Black
5 of 5
( 1 )
5 of 5 stars
( 1 review )
BuyPART NUM 251355
TruVativ Hussefelt Mountain Stems feature forged 6061-T6 aluminum construction. Forged AL-6061-T6 construction Height = 50mm, 315 grams for 60mm … read more
5 of 5
( 1 )
5 of 5 stars
( 1 review )
popular
Truvativ 00.6515.076.000your price $43.00
BuyPART NUM 251355 
Industry Nine A318 Stem, (31.8) 40mm - Silver
BuyPART NUM 171546
7075 domestically sourced aluminum is machined, anodized and assembled in North Carolina 180 degree clamp wrap with high strength 316 stainless … read more
your price $145.00 + ships free
BuyPART NUM 171546 
Renthal Apex Stem: 31.8, 1-1/8, 40mm Reach, +/- 6 degree
5 of 5
( 1 )
5 of 5 stars
( 1 review )
BuyPART NUM 324497
Renthal Apex Stems. The Renthal Apex combines All Mountain strength, Enduro stiffness and XC lightweight that makes this stem the perfect choice for any … read more
5 of 5
( 1 )
5 of 5 stars
( 1 review )
your price $140.45 + ships free
BuyPART NUM 324497 
Thomson Elite X4 Mountain Stem 40mm +/- 0 degree 31.8 1-1/8" Threadless 
4 of 5
( 2 )
4 of 5 stars average
( 2 reviews )
BuyPART NUM 751094
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 751094 
Thomson Elite X4 Mountain Stem 40mm +/- 0 degree 31.8 1-1/8 Threadless
4 of 5
( 2 )
4 of 5 stars average
( 2 reviews )
BuyPART NUM 332850
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 332850 
Ritchey RL-1 4-Axis Stem (31.8mm Clamp, 40mm), Black
BuyPART NUM 389948
With its unique faceplate design, the Ritchey 4-Axis stem was a game-changer when it was first released many years ago. Today, the OE 4-Axis-44 stem … read more
your price $29.95
BuyPART NUM 389948 
Renthal Duo Stem: 40mm 10 Degree 31.8mm 1-1/8" Black / Gold
4 of 5
( 2 )
4 of 5 stars average
( 2 reviews )
BuyPART NUM 741150
Made in Cheshire, UK CNC machined from 6082 T6 aluminium alloy Split stem design for maximum weight reduction U-shape cradle clamp eliminates handlebar … read more
4 of 5
( 2 )
4 of 5 stars average
( 2 reviews )
Three remaining at this priceyour price $132.95 + ships free
BuyPART NUM 741150 
Industry Nine A318 Stem, (31.8) 40mm - Gold BuyPART NUM 623590
7075 domestically sourced aluminum is machined, anodized and assembled in North Carolina 180 degree clamp wrap with high strength 316 stainless … read more
your price $145.00 + ships free
BuyPART NUM 623590 
Industry Nine A318 Stem, (31.8) 40mm - Blue BuyPART NUM 792048
7075 domestically sourced aluminum is machined, anodized and assembled in North Carolina 180 degree clamp wrap with high strength 316 stainless … read more
your price $145.00 + ships free
BuyPART NUM 792048 
Industry Nine A318 Stem, 31.8 x 40mm, Pink BuyPART NUM 641398
7075 domestically sourced aluminum is machined, anodized and assembled in North Carolina 180 degree clamp wrap with high strength 316 stainless … read more
your price $145.00 + ships free
BuyPART NUM 641398 
Spank Spoon 2 Stem, 31.8 x 40mm, 0°, Blue BuyPART NUM 392773
Strong yet competitively lightweight alloy stem for all disciplines Unique style, modern geometry and rock-solid construction Chamfered … read more
your price $45.99 + ships free
BuyPART NUM 392773 
Industry Nine A318 Stem - 40mm, 31.8mm Clamp, +/-4.4, 1 1/8", Aluminum, Green BuyPART NUM 320357
Industry Nine's A-Series mountain bike stems are crafted from domestically-sourced 7075 aluminum billet into a svelte design achieving a nexus of form … read more
your price $155.00 + ships free
BuyPART NUM 320357 
Industry Nine A318 Stem, (31.8) 40mm - Black BuyPART NUM 753762
7075 domestically sourced aluminum is machined, anodized and assembled in North Carolina 180 degree clamp wrap with high strength 316 stainless … read more
your price $145.00 + ships free
BuyPART NUM 753762 
Spank Spoon 2 Stem, (31.8) 0dx40mm - Red BuyPART NUM 350496
Strong yet competitively lightweight alloy stem for all disciplines Unique style, modern geometry and rock-solid construction Chamfered … read more
your price $45.99 + ships free
BuyPART NUM 350496 
Truvativ ATMOS 7K Stem, 31.8 x 40mm, 1-1/8", +/-6d, Black BuyPART NUM 355310
Lightweight, performance stem designed for trail and cross-country use All fasteners are adjustable via a T25 tool for easy,quick adjustments … read more
your price $75.00 + ships free
BuyPART NUM 355310 
Industry Nine A318 Stem, (31.8) 40mm - Purple BuyPART NUM 207499
7075 domestically sourced aluminum is machined, anodized and assembled in North Carolina 180 degree clamp wrap with high strength 316 stainless … read more
your price $155.00 + ships free
BuyPART NUM 207499 
Industry Nine A318 Stem, (31.8) 40mm - Orange BuyPART NUM 515268
7075 domestically sourced aluminum is machined, anodized and assembled in North Carolina 180 degree clamp wrap with high strength 316 stainless … read more
your price $145.00 + ships free
BuyPART NUM 515268 
Industry Nine A318 Stem, (31.8) 40mm - Lime BuyPART NUM 133809
7075 domestically sourced aluminum is machined, anodized and assembled in North Carolina 180 degree clamp wrap with high strength 316 stainless … read more
your price $145.00 + ships free
BuyPART NUM 133809 
Industry Nine A318 Stem, (31.8) 40mm - Red BuyPART NUM 611735
7075 domestically sourced aluminum is machined, anodized and assembled in North Carolina 180 degree clamp wrap with high strength 316 stainless … read more
your price $145.00 + ships free
BuyPART NUM 611735 
"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."
Thomson is leading with innovative design for two primary markets - aerospace and cycling.
"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.'
We define color as the main color of the item. It may have accents or highlights in other colors.
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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