50 mm 31.8 mm Bicycle Stems
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.
Bar clamp diameter is the diamater of the handlebar.
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Showing 61 products:
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 )
popular
In Store
Renthal STM100-BKAG
Ships Freeyour price $132.95 + ships free
BuyPART NUM 235686 
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 
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
One remaining at this priceyour price $45.99 + ships free
BuyPART NUM 278227 
Thomson X4 Mountain 31.8 50mm 90 Degrees Black 1-1/8" Threadless Stem
4 of 5
( 2 )
4 of 5 stars average
( 2 reviews )
BuyPART NUM 534897
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 534897 
Whisky No.7 MTN Stem 50mm 31.8 0 Degree Black
BuyPART NUM 816099
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 Priceyour price $48.00 + ships free
BuyPART NUM 816099 
RaceFace Atlas Stem Black 50mm x 31.8 BuyPART NUM 720812
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
your price $99.99 + ships free
BuyPART NUM 720812 
Renthal Apex Stem: 31.8, 1-1/8, 50mm Reach, +/- 6 degree
5 of 5
( 1 )
5 of 5 stars
( 1 review )
BuyPART NUM 173979
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 173979 
DMR Defy2 Stem, (31.8) 5d X 50mm - Black BuyPART NUM 579856
CNC machined 6061 aluminum stem, ideal for All Mountain and Trail use Internal steerer clamp with low stack height (31mm) Super wide … read more
your price $82.00 + ships free
BuyPART NUM 579856 
Paul Component Engineering Boxcar Stem, 50mm +/- 0 degree 31.8mm 1-1/8" Threadless Black BuyPART NUM 154649
Paul Component Engineering Boxcar Stem, 50mm +/- 0 degree 31.8mm 1-1/8" Threadless Black Item Specifications Color: Black Weight: 137 Length: 50 … read more
your price $147.50 + ships free
BuyPART NUM 154649 
Easton Cycling EA70 Threadless Stem, 31.8 x 50mm, 1-1/8', +/-7d, Black BuyPART NUM 188404
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 + ships free
BuyPART NUM 188404 
Easton Cycling EA50 Threadless Stem, 31.8 x 50mm, 1-1/8", +/-7d, Black BuyPART NUM 184459
Forged EA50 alloy for toughness Patented DST distributes clamping forces over a larger area Clamp diameter: 31.8mm Weight: 160g … read more
your price $44.99
BuyPART NUM 184459 
Thomson X4 Mountain 31.8 50mm 90 Degrees Silver 1-1/8" Threadless Stem
4 of 5
( 2 )
4 of 5 stars average
( 2 reviews )
BuyPART NUM 465413
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 465413 
Race Face Chester Stem: 50mm +/- 8 degree Black BuyPART NUM 790623
Race Face Chester Stem: 50mm +/- 8 degree Black Item Specifications Color: Black Length: 50 Bar Clamp Diameter: 31.8 Stem Angle: +8 S.H.I.S. Stem … read more
your price $54.99 + ships free
BuyPART NUM 790623 
TruVativ Holzfeller Stem 50mm 0deg 31 .8 1-1/8 Blast Black BuyPART NUM 278253
TruVativ Holzfeller Mountain Stems are constructed of forged 66 aluminum. Forged AL-66 construction Height = 50mm, 290 grams for 60mm Item Specifications … read more
your price $62.00 + ships free
BuyPART NUM 278253 
Industry Nine, A318, Stem, Diameter: 31.8mm, Length: 50mm, Steerer: 1-1/8", 5 degree, Pink
BuyPART NUM 579383
Crafted from domestically-sourced 7075 aluminum billet 180 degrees of handlebar contact on the stem body for twist-free security that will … read more
your price $155.00 + ships free
BuyPART NUM 579383 
Industry Nine A318 Stem, 31.8 x 50mm, +/-5d, Turquoise BuyPART NUM 159408
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 159408 
Industry Nine A318 Stem, 31.8 x 50mm, +/-5d, Red BuyPART NUM 280951
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 280951 
Industry Nine A318 Stem, 31.8 x 50mm, +/-5d, Silver BuyPART NUM 376082
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 376082 
Burgtec Enduro MK3 Stem, (31.8) 0d X 50mm - Black BuyPART NUM 314433
Updated version sheds weight and adds sleek lines CNC machined aluminum with internal steerer clamping system Extra tall 48mm stack … read more
your price $125.39 + ships free
BuyPART NUM 314433 
KS Ether Stem, 31.8 x 50mm, 0 Degrees, Black
BuyPART NUM 635187
Forged and CNC machined aluminum with black on black graphics KS's tuned flex system offers the perfect balance of comfort and control when … read more
10% offretail $65.00 your price $58.50 + ships free
BuyPART NUM 635187 
Thomson is leading with innovative design for two primary markets - aerospace and cycling.
"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."
"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 products are one of our best sellers.
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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