Kyosho IF350-6514 70mm Front Big Shock Spring Gray

A pair of 70mm front Big Bore shock springs, wound with 1.4mm wire over 6.5 turns and color coded gray.

Kyosho's numbering encodes the spec directly: 6.5 turns of 1.4mm wire at a 70mm free length. Within a fixed wire diameter and free length, fewer turns raise the spring rate, so at 6.5 turns this is a firmer spring than the eight-turn version in the same series. The color code exists so you can identify a spring at a glance rather than measuring it.

A firmer front spring resists dive under braking and keeps the chassis flatter through the middle of a corner, which gives more precise, more predictable steering on high-grip groomed surfaces. It also holds the front up better over big jump faces. The trade-off is that a stiff front skates on loose or rough ground where a softer spring would let the tires load up and find bite.

Kyosho describes these as front springs offering a range of steering settings. They are an optional tuning part rather than a stock replacement. Fitment covers the Inferno MP10 TKI2 and TKI3, MP9 TKI4 V2, Inferno NEO 3.0 and 4.0, MP10e, and the FO-XX 2.0 and USA-1 monster trucks.