REVERSE Knuckle SPL2.5 (S14 / S15)

The SPL2.5 is the latest REVERSE knuckle and the successor to the GEN2.0 released in 2023. Developed and tested in D1GP, D1 Lights and regional competition, it delivers a large increase in steering angle over the BASIC model while keeping the REVERSE concept: get the car turned in and get back on the throttle immediately.

Turn-in is sharp and the car rolls freely through the corner, countering the push-understeer that is common now that high-grip rear tires and extended lower arms are the norm. The steering rack stays in the factory position — no rack relocation or spacers are required.

Recommended setup

• +35mm extended front lower arms
• 155mm tie rod ends
• Adjustable tension rods (GKTECH or ORIGIN Labo.)

This is not a bolt-on replacement like the BASIC model; it is designed around the setup above.

Fitment

Nissan S14 / S15 Silvia (also C34 / C35). S13 requires an S14/S15 5-lug front conversion.

Includes

Left & right knuckles (green), stickers, instructions with recommended alignment settings. No factory core exchange required.

Part number

RKB-SPL2.5

For off-road / competition use only. Not intended for use on public roads.

Made to order. Each knuckle is built by hand after your order is placed, so lead time can vary when demand is high. Orders cannot be cancelled or returned once placed.

Ships from Japan. Price includes U.S. import duties — no surprise charges at delivery. DHL Express shipping and sales tax (where applicable) are calculated at checkout. Typical delivery is about 2 weeks.