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Industry Nine
A318 Stem

5 out of 5 stars
3 Reviews
$116.25 - $155.00
Up to 10% off



Why We Like The A318 Stem

Industry Nine has been making world-class cycling components in their Asheville, North Carolina machine shop for over a decade. Their A-series stems are crafted from a solid billet of high-grade 7075 aluminum, and are available in a variety of lengths well-suited to modern trail bike geometry. Choose from 11 striking anodized colorways to help your bike stand out from the crowd.


  • A strong, stiff, high-quality mountain bike stem
  • Made entirely in I9's Asheville, North Carolina facility
  • Machined from a billet of high-grade 7075 aluminum
  • Strength tested well beyond industry standards
  • Burly stainless steel bolts match the strength of the stem
  • Choose from 11 anodized colors and 3 different lengths
  • Fits 31.8mm diameter handlebars only
  • Item #NIN1WU7
[stem] 7075 aluminum, [bolts] 316 stainless steel
30, 40, 50mm
[30mm] +/- 8-degree, [40mm] +/- 6-degree, [50mm] +/- 5-degree
Clamp Diameter
Steer Tube Diameter
Bar Attachment
4-bolt aluminum faceplate with 180-degree wrap
Claimed Weight
[30mm] 4.5oz (127g), [40mm] 4.8oz (136g), [50mm] 5.5oz (155g)
Manufacturer Warranty
2 years

Overall Rating

5 based on 3 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 0 reviews
3 Stars - 0 reviews
4 Stars - 0 reviews
5 Stars - 3 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

March 10, 2024

Love the I9 Stems!

I've put it through the wringer
Size Bought:
50mm -318 size

I got a new bike that needed a 50mm stem and this Orange colored I9 - 318 stem was on sale. I would of bought it off sale anyway. They just fit so well, look so good and have the best polished edges and thick anodized finish around! Light too! I've got a 40mm on another bike and it's bullet proof after 2 years of hard riding.

user image
5 out of 5 stars

December 22, 2022

Top notch American craftsmanship ...

I've used it several times

It's Industry Nine, so expect something strong, well engineered and beautiful. Granted, it's a bit pricey and there are other cheaper stems that will just just as good a job, but I always choose to support small American businesses whenever I can. In a way, this stem is fancy bike bling, but it's also of the highest quality and will probably last you a lifetime.

chu100203891 c

Originally reviewed on Backcountry.com

5 out of 5 stars

February 6, 2022

Beautiful Piece of Bike Art

I've used it several times

Well designed and manufactured. Fit is perfect and it?s plenty stout. It looks amazing. No complaints about it.

Stan L

Originally reviewed on Backcountry.com