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Threadless 31.8 mm 50 mm 90 deg 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.

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.

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Showing 31 products:

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 $59.99

BuyBuyPART NUM 278227
Thomson X4 Mountain 31.8 50mm 90 Degrees Black 1-1/8" Threadless Stem
Thomson X4 Mountain 31.8 50mm 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 534897
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 $48.00 + ships free

BuyBuyPART NUM 816099
RaceFace Atlas Stem Black 50mm x 31.8
RaceFace Atlas Stem Black 50mm x 31.8

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

BuyBuyPART NUM 720812
Thomson X4 Mountain 31.8 50mm 90 Degrees Silver 1-1/8" Threadless Stem
Thomson X4 Mountain 31.8 50mm 90 Degrees Silver 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 465413
Spank Spike Race 2 Stem, 31.8 x 50mm, Red
Spank Spike Race 2 Stem, 31.8 x 50mm, Red

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

your price $59.99 + ships free

BuyBuyPART NUM 162778
TruVativ Holzfeller Stem 50mm 0deg 31 .8 1-1/8 Blast Black
TruVativ Holzfeller Stem 50mm 0deg 31 .8 1-1/8 Blast Black

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

BuyBuyPART NUM 278253
KS Ether Stem, 31.8 x 50mm, 0 Degrees, Black
KS Ether Stem, 31.8 x 50mm, 0 Degrees, BlackKind Shock

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

BuyBuyPART NUM 635187
Paul Components Boxcar Stem, (31.8) 0d X 50mm - Silver
Paul Components Boxcar Stem, (31.8) 0d X 50mm - Silver

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

your price $147.50 + ships free

BuyBuyPART NUM 284830
Origin8 Fix8 OS Stem, 1-1/8x50x31.8, Black
Origin8 Fix8 OS Stem, 1-1/8x50x31.8, Black

AL6061 3D forged aluminum construction 4 bolt front loading design EN MTN safety certified Type: Mountain Threadless Fork … read more

15% offretail $57.99 your price $49.29 + ships free

BuyBuyPART NUM 523981
Spank Spike Race 2 Stem, 31.8 x 50mm, Blue
Spank Spike Race 2 Stem, 31.8 x 50mm, Blue

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

your price $59.99 + ships free

BuyBuyPART NUM 667386
Spank Spike Race 2 Stem, 31.8 x 50mm, Black
Spank Spike Race 2 Stem, 31.8 x 50mm, Black

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 $59.99 + ships free

BuyBuyPART NUM 374863
RaceFace Atlas Stem Red 50mm x 31.8
RaceFace Atlas Stem Red 50mm x 31.8

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

BuyBuyPART NUM 562413
Thomson Elite X4 Mountain Stem - 50mm, 35mm, 0 Degree, Aluminum, Black
Thomson Elite X4 Mountain Stem - 50mm, 35mm, 0 Degree, Aluminum, BlackThomson

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

$11 offretail $114.95 your price $103.45 + ships free

BuyBuyPART NUM 299885
Truvativ Descendant 50mm 31.8mm Clamp 1-1/8" Stem Black
Truvativ Descendant 50mm 31.8mm Clamp 1-1/8" Stem Black

Item Specifications Color: Black S.H.I.S. Stem Clamp Diameter: 28.6 Bar Clamp Diameter (mm): 31.8 Length: 50 … read more

6% offretail $65.00 your price $60.99 + ships free

BuyBuyPART NUM 945504
Gusset S2 AM Stem, 31.8 x 50mm, Black
Gusset S2 AM Stem, 31.8 x 50mm, Black

CNC 7075 alloy stem 0 degree rise Item Specifications steerer dia.: 1-1/8" bar dia.: 31.8mm rise: 0 deg … read more

your price $99.00 + ships free

BuyBuyPART NUM 413040
Deity Copperhead 50mm 31.8 Stem, Silver
Deity Copperhead 50mm 31.8 Stem, Silver

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

BuyBuyPART NUM 693175
Spank Oozy Trail 2 Stem, 31.8mm x 50mm, 0 Degrees, Black
Spank Oozy Trail 2 Stem, 31.8mm x 50mm, 0 Degrees, Black

Burly 31.8mm bar clamp zone is chamfered to reduce stress risers and increase fatigue life in handelbars Iconic hourglass sectional profile … read more

Currently Sold Out

your price $49.99 + ships free

InfoInfo
RaceFace Atlas Stem Blue 50mm x 31.8
RaceFace Atlas Stem Blue 50mm x 31.8

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

Currently Sold Out

15% offretail $99.99 your price $84.99 + ships free

InfoInfo
Deity Intake Direct Mount Stem, 31.8 x 50mm, Black
Deity Intake Direct Mount Stem, 31.8 x 50mm, Black

CNC machined from hard high grade 7075 T73 aluminum offering a 50mm reach and a true zero degree rise 3 piece design utilizing a super wide … read more

Currently Sold Out

your price $119.99 + ships free

InfoInfo
Thomson

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

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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.

Kind Shock

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

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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

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