Unsprung mass is the enemy of handling. We explore how Marchesini’s forged magnesium wheels transform motorcycle dynamics.
In motorcycle dynamics, few concepts are as misunderstood — or as impactful — as unsprung mass. Every gram saved in a wheel, tyre, brake disc, or caliper has a disproportionate effect on handling compared to the same weight saved elsewhere on the motorcycle. Marchesini has built an entire brand philosophy around this principle.
Understanding Unsprung Mass
Unsprung mass refers to the components not supported by the suspension — primarily the wheels, tyres, brake discs, and calipers. When a wheel hits a bump, the suspension must control both the sprung mass (the rest of the motorcycle) and the unsprung mass simultaneously. Heavier unsprung components require more suspension force to control, reducing the suspension’s ability to keep the tyre in contact with the road surface.
The practical result: heavier wheels cause the tyre to skip and bounce over surface imperfections rather than tracking them smoothly. On a smooth circuit this effect is reduced, but on real-world roads and imperfect track surfaces, the difference between a heavy cast wheel and a lightweight forged unit is immediately apparent.
Marchesini’s Forging Process
Marchesini produces wheels in both forged aluminium and forged magnesium. The forging process — pressing heated metal into a die under enormous pressure — aligns the grain structure of the metal, producing a component that is significantly stronger than a cast equivalent at the same weight. This allows Marchesini to remove material aggressively, creating wheels that are both lighter and stronger than cast alternatives.
Their magnesium wheels, used by factory MotoGP and World Superbike teams, represent the absolute pinnacle of wheel technology. A typical Marchesini magnesium front wheel weighs around 2.8kg — compared to 4.5-5kg for a standard cast aluminium unit. That 1.7kg saving at the wheel translates to a handling transformation that must be experienced to be believed.
Which Marchesini Wheel is Right for You?
For road and track day use, Marchesini’s forged aluminium range offers an excellent balance of performance and durability. The M7R Genesi and M10RS Kompe are popular choices for sportsbike owners seeking a meaningful upgrade without the cost and care requirements of magnesium. For dedicated race use, the magnesium M7RS Genesi or M10RS Corse deliver maximum performance.
TAW Vehicle Concepts stocks Marchesini wheels for a wide range of motorcycles and can advise on fitment, tyre compatibility, and the correct specification for your application. Contact our team for a personalised recommendation.
