USD 36.95-42.95 each (manufacturer shop)
Kobra (K885)
Tires - off-road. Wide semi-slick tyre with a flat centre and knobbly shoulders for moving between pavement and rough ground.
Primo
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Primo · Tires - off-road · AC-118
Primo Knobby Black Side 24 x 1 3/8 wheelchair tires
Wide off-road tires need frame clearance that many everyday chairs lack. The Primo Knobby keeps the ordinary 37-540 size, so it fits where a standard tire fits, and adds a knobby tread for grass, gravel and wet paths. The tread rubber is grey and non-marking, with black sidewalls. It runs at 65 psi and is sold as a pair.
- Size (inch)
- 24 x 1 3/8
- Size (ETRTO)
- 37-540
- Pressure
- 65 psi
- Tread
- Knobby
Primo Knobby Black Side 24 x 1 3/8 key features
- Knobby tread in standard 37-540 size
- No extra frame clearance needed
- Non-marking grey tread
- Black sidewalls
- 65 psi, supplied as a pair
Who the Primo Knobby Black Side 24 x 1 3/8 suits
For users who want more outdoor traction on the chair they already have. It is a simple seasonal swap for wet months or for regular trips over grass and unpaved paths.
Figures for comparing
- Wheel size
- 24 in (ETRTO 37-540)
The same units on every product, converted from the specifications below. Where a source gives two limits, the lower one is shown.
Primo Knobby Black Side 24 x 1 3/8 specifications
| Size (inch) | 24 x 1 3/8 |
|---|---|
| Size (ETRTO) | 37-540 |
| Pressure | 65 psi |
| Tread | Knobby |
| Colour | Grey tread, black sidewall |
| Marking | Non-marking tread |
| Sold as | Pair |
| Maker country | Not confirmed |
| Brand | Primo |
| Category | Wheels, handrims and tires, Tires - off-road |
| Catalog ID | AC-118 |
Compared with the source page on 5 October 2026. Details can change, so we confirm them in your quote. Open the source page.
Primo Knobby Black Side 24 x 1 3/8: common questions
Will it fit my standard wheels?
If your wheels take a 24 x 1 3/8 in (37-540) tire, this is the same size.
Does it mark floors?
The grey tread is described as non-marking.
Is it as grippy as a 2 in tire?
A wider tire floats more on soft ground. This one trades that for fitting standard chairs.
How to get a quote for the Primo Knobby Black Side 24 x 1 3/8
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