ADCO Spare Tire Cover Sizes: Identify 1731–1739 & 1751–1758
A rear-mounted trailer or motorhome spare tire needs a cover fitted to the outside diameter of the complete tire. That number is different from the wheel's rim diameter. ADCO's black and polar-white spare-tire covers are individual wraparound covers with elasticized backs; the exact number determines the specified tire size. Use this chart to identify the matching item before buying.
How to identify the right spare-tire cover size
Measure the entire tire
Check the inflated spare from one outer tread edge to the opposite side through the middle. Measure the tire, not the smaller metal wheel in its centre.
Read the existing cover label
If the damaged cover has an ADCO number, start with the exact MPN. The black 173x and white 175x ranges are colour-specific, and not every size has an equivalent in each group.
Check clearance behind the spare
Confirm whether the tire is mounted on the rear bumper, trailer door or another carrier, and that the cover's elasticized back can sit around the tire without interference.
Measure the outside tire diameter
Full tire diameter
Original measurement illustration, not to scale. Measure edge-to-edge across the rubber tire, not the centre metal rim.
ADCO spare cover MPN and diameter chart
The chart groups the exact black and polar-white ADCO part numbers sold in our catalog. A dash means the corresponding part is not represented in this selection; it does not imply a different size would fit.
| Specified tire diameter | Black MPN | Polar White MPN |
|---|---|---|
| 34 in | 1731 | 1751 |
| 32¼ in | 1732 | 1752 |
| 31¼ in | 1733 | 1753 |
| 29¾ in | — | 1754 |
| 29 in | 1735 | 1755 |
| 28 in | 1736 | 1756 |
| 27 in | 1737 | 1757 |
| 25½ in | 1738 | 1758 |
| 24 in | 1739 | — |
Important size distinction: 29 inches and 29¾ inches are separate listed cover sizes. We have not treated them as interchangeable. Check the spare's actual outside dimension and select the correct listed cover size, following ADCO's size guidance.
Compare ADCO spare-tire covers by diameter and colour
Each product card links to the matching listing with its own part number, image and specifications. The products shown are individual spare-tire covers rather than pairs of ground-mounted wheel covers.
Black spare-tire covers
Polar White spare-tire covers
Spare cover fit questions
Should I use the number printed after “R” on my tire?
The number after R in a standard radial tire designation identifies rim diameter, not overall tire diameter. Measure the complete inflated tire and compare that outside measurement with the ADCO product size.
Does a rear spare need the same cover as the tires on the ground?
Not usually. A spare-tire cover wraps around one exposed spare wheel, whereas a parked RV wheel cover shields a tire from its exposed side. Use the product style made for your installation.
Do the black and white covers come in identical sizes?
Some sizes correspond across the two colours, but the listed selection is not identical. For example, the white 1754 is listed for a 29¾-inch tire, while the black collection shown here has no matching 29¾-inch MPN.
Related spare-wheel and trailer guides
For spare-wheel mounting hardware, compare the Stromberg TR-1/TR-2 carrier reference, C.E. Smith tire carrier guide and Dutton-Lainson spare-wheel mounting guide. If you are also securing tires while parked, the Camco wheel chock comparison covers a separate purpose.
Manufacturer reference: ADCO/Covercraft spare tire cover specifications and sizing. Select by the actual tire diameter; a part number for a different diameter is not an approved substitute.
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