ProTaper 28.6 31.8 mm Bicycle Stems
S.H.I.S clamp diameter is the steerer tube diameter.
Bar clamp diameter is the diamater of the handlebar.
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Showing 21 products:
ProTaper Stem 31.8 x 30mm, 28.6, Stealth Black 
BuyPART NUM 590926
3D forged and machined 6061 alloy construction A2 stainless Torx bolts Item Specifications steerer dia.: 1-1/8" bar dia.: 31.8mm … read more
In Store
Ships Freeyour price $104.99 + ships free
BuyPART NUM 590926 
ProTaper ATAC Stem, 31.8 x 60mm, Black BuyPART NUM 739278
Ultralight at 90g (50mm) Includes titanium hardware Laser-etched graphics Item Specifications steerer dia.: 1-1/8" bar dia.: … read more
your price $149.99 + ships free
BuyPART NUM 739278 
ProTaper ATAC Stem, 31.8 x 70mm, +/-5d, Limited Edition Turquoise BuyPART NUM 477915
The ATAC is back. One of the oldest names in the high-end stem game has returned. And this time it's all blinged out with titanium hardware and … read more
your price $149.99 + ships free
BuyPART NUM 477915 
ProTaper ATAC Stem, 31.8 x 70mm, Black BuyPART NUM 696170
Ultralight at 90g (50mm) Includes titanium hardware Laser-etched graphics Item Specifications steerer dia.: 1-1/8" bar dia.: … read more
your price $149.99 + ships free
BuyPART NUM 696170 
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 
ProTaper Trail Stem, 31.8 x 35mm, Limited Edition Polished BuyPART NUM 691605
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
5% offretail $104.99 your price $99.99 + ships free
BuyPART NUM 691605 
ProTaper Trail Stem, 31.8 x 30mm, Limited Edition Polished BuyPART NUM 473855
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
5% offretail $104.99 your price $99.99 + ships free
BuyPART NUM 473855 
ProTaper ATAC Threadless Stem, 1-1/8", 31.8 x 50mm, +/-5d, Black BuyPART NUM 304943
Ultralight at 90g (50mm) Includes titanium hardware Laser-etched graphics Item Specifications steerer dia.: 1-1/8" bar dia.: … read more
your price $149.99 + ships free
BuyPART NUM 304943 
ProTaper ATAC Stem, 31.8mm x 80mm, Black BuyPART NUM 264730
Ultralight at 90g (50mm) Includes titanium hardware Laser-etched graphics Item Specifications steerer dia.: 1-1/8" bar dia.: … read more
your price $149.99 + ships free
BuyPART NUM 264730 
ProTaper Stem 31.8 x 35mm, 28.6, Stealth Black BuyPART NUM 515853
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 $104.99 + ships free
BuyPART NUM 515853 
ProTaper ATAC Stem, 31.8 x 70mm, +/-5d, Limited Edition Polished BuyPART NUM 522971
The ATAC is back. One of the oldest names in the high-end stem game has returned. And this time it's all blinged out with titanium hardware and … read more
your price $149.99 + ships free
BuyPART NUM 522971 
ProTaper ATAC Stem, 31.8 x 60mm, +/-5d, Limited Edition Turquoise BuyPART NUM 683760
The ATAC is back. One of the oldest names in the high-end stem game has returned. And this time it's all blinged out with titanium hardware and … read more
your price $149.99 + ships free
BuyPART NUM 683760 
ProTaper ATAC Stem, 31.8 x 50mm, +/-5d, Limited Edition Turquoise BuyPART NUM 524369
The ATAC is back. One of the oldest names in the high-end stem game has returned. And this time it's all blinged out with titanium hardware and … read more
your price $149.99 + ships free
BuyPART NUM 524369 
ProTaper ATAC Stem, 31.8 x 50mm, +/-5d, Limited Edition Polished BuyPART NUM 976416
The ATAC is back. One of the oldest names in the high-end stem game has returned. And this time it's all blinged out with titanium hardware and … read more
your price $149.99 + ships free
BuyPART NUM 976416 
ProTaper ATAC Stem, 31.8 x 100mm, Black 
Info
Ultralight at 90g (50mm) Includes titanium hardware Laser-etched graphics Item Specifications steerer dia.: 1-1/8" bar dia.: … read more
your price $139.99 + ships free
Info 
ProTaper ATAC Stem, 31.8 x 90mm, Black Info
Ultralight at 90g (50mm) Includes titanium hardware Laser-etched graphics Item Specifications steerer dia.: 1-1/8" bar dia.: … read more
your price $139.99 + ships free
Info 
ProTaper Mountain Threadless Stem, 50 x 31.8 x 28.6, Black Info
3D forged and machined 6061 construction with a focus on a low weight yet durable design 4 bolt face plate with Torx bolts and ProTaper … read more
your price $99.99 + ships free
Info 
ProTaper Mountain Threadless Stem, 35 x 31.8 x 28.6, Black Info
3D forged and machined 6061 construction with a focus on a low weight yet durable design 4 bolt face plate with Torx bolts and ProTaper … read more
your price $99.99 + ships free
Info 
ProTaper Stem 31.8 x 50mm, 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 
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 
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
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