What is the model of a 110/90-16 tyre

The 110/90-16 is a metric designation, while 3.50-16 is an imperial designation. The former uses millimetres as its unit, the latter uses inches.

In 110/90-16, 110 indicates the tyre width is 110mm, 90 represents the aspect ratio, meaning the tyre's height is 90% of its width (not 90mm in absolute terms), and 16 denotes the inner diameter of the tyre or outer diameter of the rim is 16 inches.

In 3.50-16, 3.50 signifies the tyre's cross-section width is 3.50 inches, with the 16 similarly indicating a 16-inch tyre/rim diameter.

The 110/90-16 tyre is wider than the 3.50-16 and is a low-profile tyre, making it more suited to tarmac or concrete surfaces rather than gravel or muddy terrain.

The 3.50-16 is a standard tyre suitable for most surfaces, though its road performance is inferior to the former.