This is an RC-scale replacement set of alloy spring caps designed for HPI Savage 21 dampers with 170mm length. The set includes 4pcs intended to fit the top of the shock assembly where the spring seats, providing a durable mounting point for common tuning adjustments.
Material and role: the caps are described as alloy, so their main function is to offer a more rigid spring seat compared with stock plastic parts, which helps maintain consistent spring preload and reduces deformation under load during off-road runs.
Installation notes: these caps install at the shock top, replacing the original spring seats. Basic disassembly of the shock end is required, and typical tools are a hex driver for shock hardware and a soft-jaw vice or padded pliers to avoid scratching the alloy; no special tools are supplied.
Tuning context: riders use alloy spring caps to stabilise spring alignment, make small preload adjustments repeatable, and to ensure the spring does not shift under lateral forces during jumps or rough terrain. They are a straightforward hop-up for Savage 21 owners who want a firmer spring interface without changing spring rates or damper internals.
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