40-inch tire sizes

A 40-inch tire is any size that stands about 40″ tall. We list 9 sizes for 17″ to 26″ wheels, and their makers list them at 39.5″ to 39.8″ tall.

40-inch tires in metric

Every 40″ size we list, by wheel size. Most searched first.

Wheel	Metric	Flotation
17″	–	40×13.50R17, 40×12.50R17
18″	–	40×13.50R18
20″	–	40×13.50R20, 40×14.50R20, 40×15.50R20
22″	–	40×15.50R22
24″	–	40×15.50R24
26″	–	40×15.50R26

40-inch tires on 17-inch rims

2 sizes. All 17-inch sizes

Size	Published height ″	Size code ″	Width ″	Tires
40×13.50R17	39.50–39.80	40.00	13.5	6
40×12.50R17	39.80	40.00	12.5	1

40-inch tires on 18-inch rims

1 size. All 18-inch sizes

Size	Published height ″	Size code ″	Width ″	Tires
40×13.50R18	39.50	40.00	13.5	2

40-inch tires on 20-inch rims

3 sizes. All 20-inch sizes

Size	Published height ″	Size code ″	Width ″	Tires
40×13.50R20	39.50	40.00	13.5	2
40×15.50R20	39.66	40.00	15.5	1
40×14.50R20	39.80	40.00	14.5	1

40-inch tires on 22-inch rims

1 size. All 22-inch sizes

Size	Published height ″	Size code ″	Width ″	Tires
40×15.50R22	39.72–39.80	40.00	15.5	2

40-inch tires on 24-inch rims

1 size. All 24-inch sizes

Size	Published height ″	Size code ″	Width ″	Tires
40×15.50R24	39.76	40.00	15.5	1

40-inch tires on 26-inch rims

1 size. All 26-inch sizes

Size	Published height ″	Size code ″	Width ″	Tires
40×15.50R26	39.76	40.00	15.5	1

Questions about 40-inch tires

What size is a 40 inch tire?

A 40-inch tire stands about 40 inches tall. It isn't one size: we list 9 sizes of that height for 17″ to 26″ wheels. Their makers list them at 39.5″ to 39.8″ tall.

How wide is a 40 inch tire?

From 12.5″ to 15.5″ (318–394 mm) across the 9 sizes here. Width is part of the size code, not the height, so check it separately for clearance.