Accelera 285/40 R21 109W IOTA ST68 2024

Accelera Iota ST68 285/40 R21 109W is a road-oriented SUV tyre designed for drivers who want a wide footprint, stable highway behaviour and controlled steering response. This exact 285/40ZR21 configuration is an XL tyre with a 109W service description, providing a maximum load capacity of 1,030 kg per tyre and a maximum rated speed of 270 km/h. Its 285 mm width and 40-series profile balance road stability with more sidewall cushioning than lower-profile configurations.

About Accelera Iota ST68 285/40 R21 109W

The Iota ST68 is an Accelera SUV tyre developed around paved-road driving, directional stability and wet-weather traction. For the exact 285/40ZR21 109W XL configuration, the manufacturer specifies a 10.0-inch measuring rim, 290 mm section width, 761 mm overall diameter, 8.2 mm tread depth and 51 psi maximum inflation pressure. The XL construction is important for this size because it supports the 1,030 kg maximum load associated with the 109W specification. Exact vehicle approval should always be checked against the vehicle placard.

Tread design and steering response

The Iota ST68 uses an asymmetric tread arrangement with three interlocked tread block lanes intended to support directional stability and steering response. Longitudinal grooves provide channels for water evacuation, while the tread's additional biting edges help maintain contact on wet pavement. The design is primarily intended for paved-road SUV use rather than loose surfaces or demanding off-road conditions. The 40-series profile also keeps sidewall movement relatively controlled during steering inputs.

Dry-road handling and cornering

The 285 mm section width provides a broad contact footprint, while the 40-series sidewall gives this Accelera a relatively low-profile road character without being as rigid as a 30- or 35-series setup. This combination can contribute to stable lane changes and controlled cornering. The 109W XL specification combines a 1,030 kg maximum load per tyre with a 270 km/h speed rating. Actual handling depends on alignment, suspension condition, tyre pressure, vehicle loading and driving style.

Wet-road traction and braking

Water evacuation is a central part of the Iota ST68 tread design. The main longitudinal grooves help move water away from the contact patch, while the tread edges provide additional opportunities for wet-road grip. Accelera's published Iota ST68 specification gives a UTQG rating of 400 AA, representing a 400 treadwear grade with A traction and A temperature classifications. The exact-size European specification lists C wet grip. These classifications are comparative ratings and should not be interpreted as guaranteed braking distances.

Ride comfort, noise and everyday driving

The 40-series profile offers a useful compromise between handling response and sidewall cushioning. It provides more impact absorption than lower-profile 35-series Iota ST68 configurations while retaining a relatively responsive steering character. The exact-size European specification lists 68 dB external rolling noise with a C noise classification. Real-world cabin noise and ride comfort can vary with road surface, tyre pressure, suspension condition, wheel design and vehicle insulation.

Who should consider this Accelera?

Accelera Iota ST68 285/40 R21 109W is suited to SUV drivers seeking a wide, reinforced road tyre with stable handling and predictable wet-weather behaviour. It may not be the preferred option for serious off-road driving, dedicated winter conditions or buyers specifically requiring run-flat mobility. For customers using Dwbtyres to buy car tyres in UAE, the vehicle placard and existing sidewall markings should be checked before ordering. Buyers comparing Accelera Tyres should match the complete 285/40 R21 109W XL specification.