A lighter bike does help kids riding ability. Also, suspension kinematics generally work better with a lighter unsprung mass (i.e. lighter bike). Here's why:
- A lighter unsprung mass allows the suspension to react more quickly and effectively to terrain irregularities.
- Reducing unsprung weight improves tire grip on the ground, which is crucial for ground holding and bike control.
- A lighter mass develops less inertia, which improves the bike's acceleration and braking performance...Think of Jackson Goldstone on rough courses!
- Reducing unsprung weight allows the suspension to work more efficiently, reducing vibrations more quickly and thus improving traction.
It's important to note that while lightness is advantageous for many aspects of performance, heavier bikes can be faster downhill. The choice of optimal weight therefore depends on the rider, type of terrain and riding style targeted. But for children, all things being equal, a lighter bike is the better option.
From a technical point of view, the suspension works better with a lighter bike. It allows for better weight distribution: A lighter bike allows for a greater difference between the weight of the bike and the rider. This better weight distribution allows the suspension to work more efficiently, as it is primarily designed to handle the weight of the rider rather than the bike (i.e. unsprung mass).
However, we know an air suspension works better with more air pressure, as the impact of seals friction and overall stiction is reduced. Kids are light, so they are limited in the amount of air pressure they can put in the suspension. Hence the benefit for a higher leverage ratio suspension combined with a lightweight mountain bike.
