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K-Edge Shimano Di2 Junction Box Stem Mount
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K-Edge Shimano Di2 Junction Box Stem Mount


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Mfg PartNum: K13-370-BLK
MSRP: $16.99
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Ditch The Zip Ties For Your Di2

When it comes to mounting your Di2 Junction Box, you no longer need zip ties. The K-Edge Di2 Junction Box Stem Mount secures your junction box cleanly without zip ties. It is Shimano Di2 compatible only and fits standard steerer tubes of 1-1/8". It is made from stainless steel and has a black oxide finish.

Compatible with Shimano Di2 Junction Port A.


  • Long Version. For Stems 100mm and longer
  • Secures Junction Box cleanly without zip ties
  • Shimano Di2 Compatible only
  • Fits standard steerer tubes 1 1/8th
  • Thickness- 0.9 mm. Not enough to truly alter your stack height
  • Stainless Steel, black oxide finish
  • Bendable for a precise fit
  • Weight- 6.6 grams
  • Made in USA

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

The product weight specified is an approximate weight based on the manufacturer's specifications (if available) or our measurement of one or two examples. For most products, the weight will typically vary by 5% to 10%.


Weight: 6 grams

Mfg PartNum: K13-370-BLK 


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Reviewed 11/3/2022
by tahevol
Cycling Enthusiast
Value Rating
Overall Rating
The best way to fix an external junction box

The placement of the external junction box has always been janky with the provided fixing strap. This Stem mount is perfect. Its easy to install and the junction box snaps right in. I toured with it recently and no problems.

I bought a second one for another Di2 bike where I had previously used electric tape.

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