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RBP Repulsor
RBP Repulsor RBP Repulsor R/T 305/55R20
RBP Repulsor RBP Repulsor R/T 305/55R20
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Looking for a 305/55R20 tire? The RBP Repulsor Repulsor R/T is available now at ThreePiece.us with free shipping on every order and Affirm financing at checkout.
What 305/55R20 means
In the size 305/55R20, 305 is the section width in millimeters (12.01 in), 55 is the aspect ratio — the sidewall stands 55% as tall as the tire is wide, or 167.8 mm (6.60 in) — R denotes radial construction, and 20 is the wheel diameter in inches. That works out to an overall diameter of about 33.21 inches, turning roughly 607 revolutions per mile. Overall diameter is what matters for speedometer accuracy and clearance when you change sizes, so compare it — not just the width — against your current tire.
The manufacturer lists the overall diameter of this specific tire as 20 inches — when clearance is tight, go by the published figure rather than the nominal size math.
The service description on this tire decodes to a load index of 121 — a maximum load of 3,197 lbs per tire, or 118 (2,910 lbs) per tire when mounted as duals. The speed symbol S corresponds to a maximum sustained speed of 112 mph.
Specifications
| Size | 305/55R20 |
| Service Description | 121/118S |
| Load Index | 121/118 |
| Speed Rating | S |
| Section Width (mm) | 305 |
| Aspect Ratio | 55 |
| Overall Diameter (in) | 20 |
Frequently asked questions
Will 305/55R20 tires fit my vehicle?
Check the size molded into your current tire's sidewall or the tire placard inside the driver's door jamb — if it reads 305/55R20, this tire matches your vehicle's fitment. If you're changing sizes, compare overall diameter to keep your speedometer and clearances right. See every 305/55R20 tire in stock to compare options.
How fast does this tire ship?
Every order at ThreePiece.us ships free, with fast delivery from a nationwide warehouse network. Affirm financing is available at checkout.
What does 121/118S mean on the RBP Repulsor Repulsor R/T?
121/118S breaks down as load index 121 — rated for 3,197 lbs per tire (118, or 2,910 lbs, in dual fitment) — with an S speed rating, good for a maximum sustained 112 mph.
Keep shopping
Shop all 305/55R20 tires, browse RBP Repulsor tires, see every RBP Repulsor Repulsor R/T size, or view all tires at ThreePiece.us.
- BRAND:
- RBP Repulsor
- Model:
- RBP Repulsor R/T
- Size:
- 305/55R20
- Aspect Ratio:
- 55
- Load Index:
- 121/118
- Section Width:
- 305
- Service Description:
- 121/118S
- Speed Index:
- S
- Tire Rim Diameter:
- 20
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