Kyosho W5313-21 Spring (Φ1.2 x 9 x 61/2.1/2 pieces)

Dial in your Ultima RB7.5's suspension with these performance springs that strike the perfect balance between control and compliance. The slightly firmer 2.1 rate offers improved stability while maintaining the 61mm length for consistent installation and predictable handling.

Key Features

• Precision-engineered - 1.2mm wire with 9mm coil diameter

• Optimized rate - 2.1 spring constant for balanced response

• Extended travel - 61mm length maintains suspension geometry

• Matched set - Two identical springs for even performance

Why These Springs Shine

• Smooth transition - Progressive compression characteristics

• Better mid-corner support - Firmer than standard 2.0 rate

• Track versatility - Works across various surfaces

• Easy upgrade - Direct replacement for stock components

Technical Specifications

• Wire thickness: 1.2mm

• Coil spacing: 9mm

• Free length: 61mm

• Spring rate: 2.1

• Material: High-grade steel alloy

Ideal Uses

• Medium-grip outdoor tracks

• Courses with moderate bumps

• Transitional weather conditions

• When running medium-weight shock oil

Refine your RB7.5's handling with these carefully calibrated springs that offer the ideal compromise between traction and control for competitive racing conditions.