This Goped Petrolscooter Tyre is a high-quality replacement part. The size is known as 4.10 / 3.50 - 4 or 4.10-4 or 3.50-4 or 410-4 or 350-4. It will fit a 4-inch wheel rim and is suitable for both front and rear wheels. PetrolScooter brand, MPN: 410/350-4.