Striving to further improve the A10 platform, ARC has been busy testing and developing the platform over the past 18 months to further increase performance. They have incorporated all these learnings to deliver the new A10-25.
While it shares the A10 name, the 2025 car incorporates numerous changes with only the drivetrain and shocks carried over from the 2023 car!
All-new Bulkheads
The new motor bulkhead comes with a ball bearing below the 20T center pulley to prevent belt flyover during hard acceleration and braking. It also helps to significantly extend the lifespan of the drive belts.
The A10-25’s lower and motor bulkheads are designed with pins on the bottom to locate them precisely to the chassis. Meanwhile the upper bulkheads also feature locating features to the lower bulkheads. This ensures the A10-25 can be assembled with greater precision and allows the setup to be precisely maintained.
New Chassis & Lower Arms
Both front and rear lower arms are 2mm longer than before. Meanwhile the chassis design has been refreshed to improve flex characteristics.
These design changes maximize corner speed of the A10-25 over a wider range of conditions while significantly increasing drivability.
New Shock Towers
The A10-25 moves away from traditional carbon shock towers with aluminum shock towers that connect directly to the chassis and to the sides of the bulkhead.
Shock angle is no longer limited by the holes on the shock towers, with shock angle adjusted by adding or removing shims. This allows the shock absorber geometry to be precisely fine-tuned in smaller increments.
The rear active shock tower allows suspension behavior to be further fine-tuned. For example, when traction is too high and rear rotation is insufficient, engaging the active suspension can increase off-power steering.
New CNC-machined 7075-T6 Steering Blocks
The A10-25 features new steering blocks made from CNC-machined 7075-T6 aluminium. The new steering block together with the zero-play design allows all play to be removed between the steering, bearing and wheel hex adaptor.
The new steering block is completely different to the old plastic design. By redesigning the offset and putting the wheel axle in its optimal position, the A10-25 delivers maximum mechanical traction and cornering performance.
New Front DCJ Driveshafts
The new front DJ CVD features a new big bore structure, with the internal drive shaft pin diameter increased from 1.5mm to 2mm.
The new DJ CVD case is made from lightweight, hard-anodized aluminum to reduce rotating mass without sacrificing durability and performance.
New Lower Pivot Ball
Lastly the A10-25 features a new 5.8mm titanium lower pivot ball design for use below the steering block. The specially designed pivot ball allows an M3x4 round head screw to be installed onto the bottom of the pivot ball. This significantly reduces the likelihood of the ball pulling out of the arm socket during accidental impact.
