Can there be different treads on the front and rear tyres?

Yes, in most places, including Spain, it is allowed to have different tread patterns on the front and rear tyres, as long as both tyres on the same axle are identical .

Important Rules:

Tyres on the same axle must match (same brand, model, size, load, and speed rating)

Different tread patterns between front and rear axles are permitted

Tyres must have at least 1.6 mm of tread depth to be road-legal

Best Practice: While it’s legal, for better safety, stability, and performance—especially in wet conditions—using the same tread pattern on all four tyres is highly recommended .