Threadless 31.8 mm 45 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 21 products:
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
In Store
Promax ST21-0DA20545-BK
Ships Freeyour price $31.99 + ships free
BuyPART NUM 425732 
Dimension Trail Stem - 45mm, 31.8mm, +/- 6 Degree, Aluminum, Black Dimension Trail Stem: 45mm, 31.8, +/-6 Deg, 1-1/8", Black
BuyPART NUM 551340
For cross country and all-mountain riding, Dimension Trail Stems provide a broad array of sizing options--lengths from 35 to 120mm--rigorously tested … read more
your price $36.99 + ships free
BuyPART NUM 551340 
Ritchey Trail Stem - 45 mm, 31.8 Clamp, +/-0, 1 1/8", Alloy, Black
BuyPART NUM 303891
The Ritchey Trail Stem is the first Ritchey stem specifically designed for today's 5 to 6 inch travel trail bikes using wide bars. C220 with forward … read more
your price $49.95 + ships free
BuyPART NUM 303891 
Origin8 Flow 3D MTB Stem, 45x31.8x28.6 0d, Black BuyPART NUM 200739
3D forged AL6061-T6 alloy construction 40mm stack height 4 bolt front loading faceplate design ISO-Mountain safety certification … read more
15% offretail $51.99 your price $44.19 + ships free
BuyPART NUM 200739 
Kalloy Uno Advanced Project Stem, 31.8 x 0d x 45mm Black BuyPART NUM 775099
Lightweight 3D forged 6061-T6 aluminum 4-bolt faceplate Opposing 2-bolt steerer clamp stack height = 40mm 125g (45mm) … read more
your price $16.99
BuyPART NUM 775099 
Ritchey Comp Trail Stem (35) 0dx45, Black BuyPART NUM 881290
Extra-wide 41mm wide bar clamp improves stiffness and fits most riser bars 3D forged 6061 alloy 42mm steerer height 142g (90mm) … read more
your price $59.95 + ships free
BuyPART NUM 881290 
Promax Gryf 31.8mm MTB Stem, Length 45mm, 1-1/8" Threadless Black BuyPART NUM 960766
Promax Gryf Stems. Rugged, durable, dependable. The GRYF stem was designed and cold forged to hold up on any ride. City, trail, mountain. Item Specifications … read more
your price $44.99 + ships free
BuyPART NUM 960766 
Origin8 Flux MTB Stem 1 1/8" x 31.8mm clamp 45mm 0 degree BuyPART NUM 297238
Full CNC machined AL6061-T6 alloy construction 35mm stack height 4 bolt front loading faceplate design ISO-Mountain safety certification … read more
15% offretail $99.99 your price $84.99 + ships free
BuyPART NUM 297238 
Ritchey WCS Trail Stem: 45mm, +/- 0, 31.8, 1-1/8, Blatte BuyPART NUM 383693
Ritchey Stems 3D Forged 2014 alloy C220 with forward facing bolt design for easy installation 220 degree, extra-wide bar clamp improves … read more
your price $99.95 + ships free
BuyPART NUM 383693 
Spank Split 35 Stem - 45mm 35mm 0 Degree Alloy Black BuyPART NUM 806463
Highly weight optimized single crown stem, ideal for Enduro applications with 31.8mm handlebars Human Factor Design features micro increment size options … read more
your price $99.99 + ships free
BuyPART NUM 806463 
Chromag Riza Stem, 45 x 28.6, 90 Degree, Gold BuyPART NUM 601824
M6 bolts Wide clamping area spreads load over large area 1 piece faceplate CNC machined in Whistler, Canada Faded edges … read more
your price $135.00 + ships free
BuyPART NUM 601824 
Chromag Riza Stem, 45 x 28.6, 90 Degree, Blue BuyPART NUM 674993
M6 bolts Wide clamping area spreads load over large area 1 piece faceplate CNC machined in Whistler, Canada Faded edges … read more
$13 offretail $135.00 your price $121.50 + ships free
BuyPART NUM 674993 
Chromag Riza Stem, 45 x 28.6, 90 Degree, Black BuyPART NUM 170652
M6 bolts Wide clamping area spreads load over large area 1 piece faceplate CNC machined in Whistler, Canada Faded edges … read more
Three remaining at this price$13 offretail $135.00 your price $121.50 + ships free
BuyPART NUM 170652 
Chromag RIZA Stem, (31.8) 90d X 45mm - Red BuyPART NUM 262128
CNC machined in Whistler, Canada from premium 6061 billet aluminum Features a new faded edge on the clamp face to help avoid hot spots and … read more
$13 offretail $135.00 your price $121.50 + ships free
BuyPART NUM 262128 
EVO, Caliber, Stem, Diameter: 31.8mm, Length: 45mm, Steerer: 28.6mm, 0 degree, Black BuyPART NUM 721298
3D forged alloy construction Fits 1-1/8 (28.6mm) steerer forks Fits 31.8mm handlebar clamp Heat treated hardware Item … read more
your price $39.99 + ships free
BuyPART NUM 721298 
FSA Gradient Stem, 31.8 x 45mm, 1-1/8", Black
Info
BTI Part Number: FS-4320 Vendor Part Number: 170-0009002050 Steerer Diameter: 1-1/8: Bar Diameter: 31.8 Rise: … read more
your price $74.00 + ships free
Info 
Tag Metals T1 Stem, 31.8 x 45mm, Black Info
CNC machined 2014 aluminum body with 4-bolt bar clamp TAG speed adjust bar markings for quick and easy set up 166-222g including bolts … read more
$35 offretail $109.99 your price $74.99 + ships free
Info 
ProTaper Stem 31.8 x 45mm, 28.6, Stealth Black Info
3D forged and machined 6061 alloy construction A2 stainless Torx bolts Item Specifications steerer dia.: 1-1/8" bar dia.: 31.8mm … read more
your price $119.99 + ships free
Info 
NS Bikes Quantum Lite Stem, 31.8 x 45mm, 0 Degrees, Black Info
Lightweight, cold forged, CNC machined 6061-T6 aluminum Knee friendly steerer tube clamp design with 5mm tapered-head bolts. 140g Item … read more
your price $84.99 + ships free
Info 
Octane One Tone Stem, 31.8mm x 45mm, Red Info
3D forged 6061 aluminum, perfect for All Mountain and Trail riding 40mm steerer clamp height 138g (31.8mm) Item Specifications … read more
your price $31.99
Info 
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.
"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 move forward with a desire to deliver the best possible components to our customers and a determined spirit of competition."
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 Type
This is the part number or identifier for this item from the manufacturer
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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