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 48 products:
Salsa Guide Trail Stem- 40mm, 31.8 Clamp, 0 Degree, 1 1/8", Aluminum, Black
Info
The Guide Trail Stem translates your handlebar input into precise trail movements. It's an ideal choice for modern trail bikes that have a long front … read more
popular
Lowest Price
Salsa 06-001937_PMT02
Ships Free10% offretail $45.00 Ends 10/8! $40.50 + ships free
Info 
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 )
26% offretail $43.00 your price $31.99
BuyPART NUM 251355 
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
10% offretail $48.00 Ends 10/8! $43.20 + ships free
BuyPART NUM 601487 
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 
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 
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 
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 
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 - 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 
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 )
Two remaining at this priceyour price $114.95 + ships free
BuyPART NUM 332850 
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 
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 )
your price $132.95 + ships free
BuyPART NUM 741150 
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 
ProTaper Trail Stem, 31.8 x 40mm, Limited Edition Polished BuyPART NUM 456171
The ProTaper stem may look simple, but under that beautiful veneer lies hours of 3D modelling, countless FEA revisions, and tons of real-world … read more
your price $104.99 + ships free
BuyPART NUM 456171 
TruVativ Hussefelt Stem 40mm 0deg 31.8 1-1/8 White
5 of 5
( 1 )
5 of 5 stars
( 1 review )
BuyPART NUM 937931
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 )
5% offretail $38.00 your price $35.99 + ships free
BuyPART NUM 937931 
Reverse Base Stem, 0d, 31.8 x 40mm, Black BuyPART NUM 666284
Stable, light and shapely CNC machined 6061-T6 aluminum for All Mountain, Enduro and Slopestyle 145g (25.4mm) Item Specifications … read more
34% offretail $64.99 your price $42.99
BuyPART NUM 666284 
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 - 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 - 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 
"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."
Thomson is leading with innovative design for two primary markets - aerospace and cycling.
We define color as the main color of the item. It may have accents or highlights in other colors.
These products are one of our best sellers.
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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