Main points before buying

* Parameters of outer tire:
10*3 inch/255*80 mm(80/65-6),
outer diameter: 10 inch/255mm,
inner diameter: 6 inch/150mm,
width: 80mm,
weight: 789g/839g/776g(city road/semi off road/off road)
Max load: 85kg at 345kpa(50 psi)

* Parameters of inner tube:
10*2 or 10*2.125 or 10*2.5 inch,
valve degree: 90°.
weight: 85-95g.
Although the marked parameters would be different, but the inner tube is universal for 10*2 and 10.2.5 and 10*3 outer tire, so don't worry about the marked parameters, you don't feel any difference among them. if you don't put the tube into the tire, when you pump air into the tube, it would be deformed, it's not quality defect, just uneven, every tube would perform like this.

* The city road tire performs well on urban roads, and it has lower tyre noise, so it's quietest. The performance of off-road tyre is the opposite, and semi off-road tire performs between them. But comparing with 10*2 or 10*2.5 model, all of them would exhaust more power because of wider surface.

* These tires and inner tubes are fit for Zero 10X/Speedual, if you install it on Zero/Grace 10, the rear wheel is perfect, but there would be a slight friction between the tire and fender when you install it on the front wheel, it's not a big problem, just a little driving noise.

* These tires are fit for many other scooters, please check the original tires of your scooter, if the inner diameter is 150mm, and the size is 10*2.5/10*2, based on my experience, they are universal, such as Inokim OX/OXO etc. But I have to inform you, due to the narrow fenders or narrow swing arms, there is not enough space to accommodate such a wider tire, although the size of your scooter's hub is fit for the tire, such as Dualtron 1/2, Speedway 1/2/3/4, Inokim quick 1/2/3, all of them are incompatible!