The most commonly used types in the forklift and construction machinery industries are deep-groove, flat-bottom, and split (two-piece) rims.
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Deep-groove rims (monobloc rims) are integrally formed with a deep central groove, predominantly used for forklift front wheels and small vehicle wheels.
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Flat-bottom rims feature a level base surface, fitted with retaining rings and lock rings, and are predominantly employed on lorries and construction machinery.
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Split rims (two-piece rims), comprising left and right halves secured by bolts, are specifically designed for forklift rear wheels.
The primary distinctions between these three rim types lie in their structural design and intended applications. In simple terms, deep-dish rims are standard equipment for passenger cars, flat-bottom rims are the mainstay for lorries, while split rims are predominantly used on specialised vehicles such as heavy off-roaders.
To provide a clearer understanding, the differences between the three types of rims are summarised in the following table:
| Comparison dimension | Deep-tread wheel rim | Flat-bottomed wheel rim | Split-rim wheel |
| Structural Features | Monocoque construction, featuring a deep recessed groove encircling the mid-section for tyre removal and refitting. | Multi-piece construction, with one side flange integral to the wheel rim, utilising an integral retaining ring and an open elastic lock ring to secure the tyre. | The inner and outer sections are bolted together to form a single unit, with the inner and outer widths being either equal or unequal. |
| Principal advantages | Simple structure, high rigidity, lightweight, and convenient for fitting and removing small-sized tyres with good elasticity. | Capable of withstanding substantial loads, and featuring removable retaining rings and locking rings that facilitate the fitting and removal of large-diameter, high-hardness tyres. | The tyres are extremely easy to remove and fit, requiring only the removal of the connecting bolts. This also facilitates the use of different materials to achieve weight reduction. |
| Principal drawbacks | For larger tyres with stiffer carcasses, it is difficult to mount them onto this type of one-piece rim. | The structure is relatively complex, with numerous components and considerable weight. | The structure is complex, demanding high precision in manufacturing and assembly, necessitating the assurance of reliability for multiple connecting bolts. |
| Applicable vehicle models | Saloon cars, light off-road vehicles (such as urban SUVs) | Medium-duty and heavy-duty lorries and coaches | Medium and heavy off-road vehicles |
Regardless of your vehicle's wheel rim type, when replacing tyres, it is essential to select tyres that match the rim specifications. Using unsuitable rims not only causes premature tyre wear but also compromises driving safety.