Bottom-Out Control
The adjustable HBC system increases damping force near the end of the stroke to help manage hard impacts and reduce harsh bottom-outs.
$2,095.00
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EXT ARMA V4
DOWNHILL CONTROL
BUILT FOR BIG HITS.
Best Suited To
Downhill riders wanting a strong, quiet and highly controlled coil shock for demanding terrain.
Shock Type
Coil
EXT MTB Downhill Shock
Control
HBC
Adjustable hydraulic bottom-out control
Shaft
Ø14 mm
DLC coated steel shaft
Reservoir
55 PSI
Low pressure air reservoir
Available Sizes
ARMA V4 Length and Stroke Options
Metric Standard
210 mm
47.5 / 50 / 52.5 / 55 mm stroke
Metric Standard
230 mm
57.5 / 60 / 62.5 / 65 mm stroke
Metric Standard
250 mm
67.5 / 70 / 72.5 / 75 mm stroke
Metric Trunnion
185 mm
47.5 / 50 / 52.5 / 55 mm stroke
Metric Trunnion
205 mm
57.5 / 60 / 62.5 / 65 mm stroke
Metric Trunnion
225 mm
67.5 / 70 / 72.5 / 75 mm stroke
Why Choose the ARMA V4?
Downhill Damping Built for Control and Composure
Smoother Top-Out Feel
PSR technology is designed to eliminate harsh top-out and improve sensitivity for a more controlled ride feel.
Quiet, Stronger Package
The V4 package refines the previous generation with improved damping features, updated coatings and a stronger, quieter construction.
Technical Information
Detailed Specs
For riders and mechanics who want the full product details.
Fitment and Sizes
Shock Platform
EXT MTB Downhill Shock
Metric Standard
210 / 47.5, 50, 52.5, 55 mm
Metric Standard
230 / 57.5, 60, 62.5, 65 mm
Metric Standard
250 / 67.5, 70, 72.5, 75 mm
Metric Trunnion
185 / 47.5, 50, 52.5, 55 mm
Metric Trunnion
205 / 57.5, 60, 62.5, 65 mm
Metric Trunnion
225 / 67.5, 70, 72.5, 75 mm
Yoke Linkage Note
EXT strongly recommends E-Storia or Vecta for MTBs and e-MTBs with a Yoke linkage system
Adjustment and Damping
Compression Adjustment
High and low speed compression adjustable with 5 mm and 4 mm Allen keys
Bottom-Out Control
Externally adjustable HBC technology starts in the last 20% of the stroke
Top-Out Control
PSR position sensitive rebound hydraulic top-out system
Damping Character
Frequency dependent damping
Valve System
High turbulent flow valves with no risk of cavitation
High-Speed Control
Refined high speed control from the V3 platform
Construction and Internal Features
Shaft
Ø14 mm high strength chrome-moly steel shaft with DLC ultra-low friction coating
Tube Coating
Proprietary DHC tube coating process for improved wear resistance
Reservoir
Large volume bladder design inflated to 55 PSI only
Shock Fluid
EV2S high viscosity index fluid
Spring Bearings
Spring thrust bearings for alignment, reduced spring rub and reduced spring noise
Package
Stronger and quieter V4 package
V4 Updates
Damper Refinement
Refines V3 mid body damper characteristics, hydraulic bottom-out circuit and high speed control
Hydraulic Top-Out
Position sensitive rebound hydraulic top-out system
HBC Update
New HBC system is more powerful and starts in the last 20% of stroke
Durability Update
New proprietary DLC and DHC coatings for maximum wear resistance
Support
Manuals and Service Resources
EXT Fiveplus Warranty Program
5 Year + Warranty
EXT’s Fiveplus program gives eligible current MTB and E-MX products a total of 5 years warranty coverage, adding 3 extra years on top of the original 2-year legal warranty. To keep the extended warranty active, the product must be registered and receive a yearly full maintenance service through an official EXT distributor or authorised EXT service point.
Comparison chart
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Comparison chart
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STORIA V4
ARMA V4
ARIA
VECTA
e-STORIA
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HSC | LSC | R
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HBC
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SPRING TYPE
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APPLICATION