By TNREDITOR
05 Nov, 2025
Rims for tubeless OTR tire require the use of an O-ring, which is also referred to as a “seal ring”
O-ring forms an air-tight seal between separate parts of the rim. It must be used properly. It is very important to note that even if rim diameters are the same, different size of O-rings may be necessary depending on the type of rim used.
OR 325 T
OR–Indicates that the ring is for off-the-road tires.
3–Cross section diameter of ring (in eights of an inch)
25–Rim diameter (Bead diameter in inches)
T–Type of rim (Full tapered bead sat rim)
| O-RING Size | RIM | TIRE | SECTION DIAMETER | INSIDE CIRCUMFERENCE | ||
| MM | INCH | MM | INCH | |||
| OR224TG | 24″SDC | 24″rim | 6.70 | 0.26 | 1768.00 | 69.61 |
| OR225T | 25″SDC | 14.00-25 and under | 6.70 | 0.26 | 1802.00 | 70.94 |
| 25″TB | 17.5-25 and under 20.5-25 and under | |||||
| OR325T | 25″TB | 16.00-25 and over 20.5-25 over | 9.80 | 0.39 | 1800.00 | 71.06 |
| OR329T | 29″TB | 29″rim | 9.80 | 0.39 | 2127.00 | 83.74 |
| OR333T | 33″TB | 33″rim | 9.80 | 0.39 | 2447.00 | 96.34 |
| OR335T | 35″TB | 35″rim | 9.80 | 0.39 | 2560.00 | 100.79 |
| OR339T | 39″TB | 39″rim | 9.80 | 0.39 | 2868.00 | 112.91 |
| OR345T | 45″TB | 45″rim | 9.80 | 0.39 | 3311.00 | 130.35 |
| OR349T | 49″TB | 49″rim | 9.80 | 0.39 | 3572.00 | 140.63 |
| OR451T | 51″TB | 51″rim | 12.70 | 0.50 | 3666.00 | 144.33 |
| OR457T | 57″TB | 57″rim | 12.70 | 0.50 | 4103.00 | 161.54 |
| HALTEC NO. | TIRE TYPE | RIM SIZE | ROD DIAMETER |
| OR-21-T | Highway | 21″ | .26 |
| OR-25-T | Earthmover | 25″ | .26 |
| OR-20-JM | Highway (JM Rim) | 20″ | .26 |
| OR-22-JM | Highway (JMRim) | 22″ | .26 |
| OR-24-JM | Highway (JMRim) | 24″ | .26 |
| OR-215-H | Grader | 15″ | .28 |
| OR-217-L | Grader | 17″ | .28 |
| OR-220-TG | Grader | 20″ | .26 |
| OR-224-TG | Grader | 24″ | .26 |
| OR-225-T | Grader | 25″ | .26 |
| OR-232-TG | Grader | 32″ | .26 |
| OR-321-T | Earthmover | 21″ | .385 |
| OR-325-T | Earthmover | 25″ | .385 |
| OR-329-T | Earthmover | 29″ | .385 |
| OR-332-TG | Grader | 32″ | .385 |
| OR-333-T | Earthmover | 33″ | .385 |
| OR-335-T | Earthmover | 35″ | .385 |
| OR-339-T | Earthmover | 39″ | .385 |
| OR-343-T | Earthmover | 43″ | .385 |
| OR-345-T | Earthmover | 45″ | .385 |
| OR-349-T | Earthmover | 49″ | .385 |
| OR-449-T | Earthmover | 49″ | .50 |
| OR-451-T | Earthmover | 51′ | .50 |
| OR-451-OVM | Earthmover | 51″ | .50 |
| OR-457-T | Earthmover | 57″ | .50 |
| OR-457-OVM | Earthmover | 57″ | .50 |
| OR-463-T | Earthmover | 63″ | .50 |
| OR-463-OVM | Earthmover | 63″ | .50 |
| OR-469-T | Earthmover | 69″ | .50 |
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