Technical FAQ with Lennard Zinn: Koski Stronghold Deluxe mountain-bike stem

  • By Lennard Zinn
  • Published Jun. 6, 2002
  • Updated Oct. 12, 2010 at 7:55 PM EDT

Features: The Koski Stronghold Deluxe is a forged hollow stem of 6061-T6 aluminum with a four-bolt polished silver front plate. The shaft is matte black. The Stronghold Deluxe stem is available in two finishes, called “shot peened black” and “polished silver,” two angles, namely 7 and 15 degrees,and five lengths: 60, 75, 95, 110 and 130mm.

All of the bolts take a 5mm hex key.

Likes: This is a handsome and lightweight stem available in lots of finishes, angles and lengths. It is plenty stiff, and it has a large clamping area with the bar (these two features are probably interrelated).

Dislikes: None.

Test dates: March and April, 2002

Conditions: Mountain bike riding in Boulder and Moab

Weight: 95mm, 15 degrees: 198 grams
110mm, 7 degrees: 214 grams
130mm, 7 degrees; 236 grams

Price: $40Contact: Koski Engineering, 475 Miller Ave., Mill Valley, CA94941; 415/389-6090; Web:

FILED UNDER: Bikes and Tech TAGS: / / /

Lennard Zinn

Lennard Zinn

Our longtime technical writer joined VeloNews in 1987. He is also a framebuilder, a former U.S. National Team rider, and author of many bicycle books, including Zinn and the Art of Mountain Bike Maintenance and Zinn and the Art of Road Bike Maintenance, as well as Zinn and the Art of Triathlon Bikes and Zinn's Cycling Primer: Maintenance Tips and Skill Building for Cyclists. He holds a Bachelor’s degree in physics from Colorado College. Readers can send brief technical questions to Ask LZ.

Stay updated on all things VeloNews

Subscribe to the FREE VeloNews newsletter