1. TOP
  2. Powersports
  3. SHOWA
  4. New Products 2025
  5. A-Kit

A-Kit for CRF450R/250R 2024YM & KX450/250 2025YM

Suspension kit designed based on advanced suspension technology
adopted in the FIM Motocross World Championship (MXGP) and AMA Pro Motocross Championship

STRUCTURE structure

1
Damper

Piston bore enlargement: Φ25 (mass production) to φ27 (A-kit dedicated piston)
Internal blow structure: Resin diaphragm (A-kit dedicated mold)
Bush: Material change (newly developed material)
Stroke increase: 305mm → 310mm

2
Outer Tube & Cylinder

Micro-dimpling finish
Surface precision UP + Kashima coating extra-thick + Teflon coating
Shaft, rod pipe: Infinite dimpling finish
DimplushTM detail PDF

3
Inner Tube/ Rod

Super Finisher + Emerald Coating Multi-Layer TIo
Emerald Coating detail PDF

4
Forged Axle Holder

Shape optimized using the latest simulation technology, achieving weight reduction
(Original design: Custom mold) + Anodized + Laser engraving

5
Axle Clamping Bolt

Titanium bolt + Molybdenum coating

FEATURES Features

 


 

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We have developed the "GP Series A-Kit" using the latest race technology for popular European Motocross, aiming to make it widely available to users throughout Europe.

Speed and stability

Motocross motorcycles place significant demands on suspension performance, requiring rapid response over uneven terrain and high-impact absorption during landings. To meet these performance requirements, continuous advancements are made in suspension design--specifically through the implementation of long-stroke configurations of 310 mm to enhance damping characteristics. Additionally, friction reduction strategies are employed throughout the system to improve responsiveness and adaptability across a wide range of riding conditions.

DimplushTM and Emerald coating

The front forks use large 49 mm inner tubes which are coated with Showa original Emerald Coating. The internal surfaces of the outer tubes are made using our DimplushTM technology for improved operational performance to deliver special damping force characteristics. The rear cushion rod is also coated with our original Emerald Coating to improve operational performance.
DimplushTM detail PDF
Emerald Coating detail PDF

Same look as the TOP Works Slider suspension

You can get suspension that looks just like the one used by riders who have won championships in motocross races in the U.S., Japan, and overseas.

MOVIES movies

Front Fork
Maintenance
Rear Cushion
Maintenance
See Z900