The GPM CGK5090X is an aluminium 90mm internal shock set intended for Vaterra K-5 and listed as compatible with HPI Crawler King and Gmade R1. The engraved aluminium bodies present a clean machined finish while the sealed internals allow installation with a reduced overall stack compared to external coil-overs.
From a tuning perspective, moving to aluminium internals changes weight distribution and improves thermal transfer, offering a firm platform for testing oil viscosities and spring rates. The component ships as a single pair suitable for front or rear use depending on how your crawler is configured.
Fitting tips: verify the 90mm length, stroke and eyelet spacing against your chassis before purchase. Swap the internals into the existing housings, check for interference, then adjust oil and springs to reach desired sag and rebound for your terrain.
For hobbyists wanting a dependable internal platform for suspension tuning and a refined aluminium aesthetic, the CGK5090X 90mm internals are a practical upgrade for 1/10 crawlers.
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