Rimpact's Gravel Mass Damper: Real Physics, Narrow Use Case
Rimpact's £230 gravel fork mass damper adds 400g to delay impact peaks. It's not actually damped, sits below suspension on the comfort list, and needs big bumps to work.
Rimpact is selling a 400-gram weight-on-springs for your gravel fork at £230. The pitch: it delays peak impact force at the headtube by letting a suspended mass oscillate inside a tube while everything around it moves. Think skyscraper dampers, but smaller and—importantly—not actually damped. There's no hydraulic fluid here, just friction. The company calls it a tuned mass damper, but it's neither tuned to a specific frequency nor damped in the engineering sense. What it might do, based on accelerometer data from the brand, is smooth out how hard a bump hits you initially. Same total energy, just spread over a slightly broader peak.
The weight penalty matters. You're adding nearly a pound to the front end for something the engineer himself places below suspension forks and high-volume tires on the comfort hierarchy—closer to a compliant handlebar. That's a narrow use case: long gravel events where you've already maxed out tire volume and don't want suspension. The downhill racing uptake is real—close to half the World Cup field reportedly ran their steerer version last season—but gravel bumps are smaller, and the mechanism needs displacement to work. If you're chasing marginal gains on 200-mile dirt slogs, maybe. For weekend mixed-surface rides, you're probably better off spending that money on a second set of wider wheels.
