Kyosho XGS031 Big Bore Rear Spring M-Hard (2)

Kyosho XGS031 is a genuine pair of medium-hard rate rear shock springs for Kyosho's big bore dampers. These LL-size springs come from Kyosho's X-Gear program, where springs are wound and matched for consistent rates so the left and right rear corners behave the same way lap after lap. Medium-hard sits one step up from the medium-soft rate, reducing rear chassis roll and increasing responsiveness without going all the way to the stiff end, which makes it a common baseline rate on medium to high-grip tracks.

They install as a direct-fit tuning option on the Kyosho Ultima RT5, SC, and DB when fitted with big bore rear shocks, replacing the kit springs with no modification. Since they follow Kyosho's published rate system, they work directly alongside the rest of the XGS lineup so you can move a step softer or stiffer and know exactly what changed. Package includes two matched rear springs, one for each rear damper.