Nitro Alternator FX vs Nitro Optisym

How they compare

Both target all mountain terrain, while the Nitro Alternator FX leans more backcountry, while the Nitro Optisym leans more freestyle. The Nitro Alternator FX uses a directional shape while the Nitro Optisym is twin. Both feature camber profiles — arc underfoot for strong edge hold, pop, and stability on hardpack—lively and precise. The Nitro Alternator FX is slightly stiffer, though both sit in the stiff range.