1973 Plymouth Road Runner — Base Model
The 1973 Plymouth Road Runner Base Model shipped with 2 different factory tire sizes, depending on the wheel package it left the factory with (this can also reflect a staggered front/rear setup). Check your tire sidewall or door placard to confirm which one applies to your vehicle.
This trim shipped with more than one tire size (staggered fitment, front/rear, or optional wheel package). Confirm which one matches your vehicle by checking your tire sidewall or door placard.
205/75R14
| Section width | 205 mm |
|---|---|
| Aspect ratio (sidewall height) | 75% (153.8 mm) |
| Rim diameter | 14" |
| Overall tire diameter | ~26.1" |
| Revolutions per mile | ~773 |
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215/75R14
| Section width | 215 mm |
|---|---|
| Aspect ratio (sidewall height) | 75% (161.3 mm) |
| Rim diameter | 14" |
| Overall tire diameter | ~26.7" |
| Revolutions per mile | ~755 |
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What this size means for your Plymouth Road Runner
On the 1973 Plymouth Road Runner Base Model, the factory 205/75R14 measures about 26.1″ in overall diameter with a 153.8 mm (6.1″) sidewall, and completes roughly 773 revolutions per mile. Its 75-series aspect ratio gives a tall sidewall of the kind used on trucks, SUVs, and older passenger cars, built for cushioning and load. In tire terms it is a small-diameter fitment typical of older or economy vehicles.
The 205/75R14 and 215/75R14 differ in both width and overall diameter (0.6″, 2.3%), which usually means a staggered front/rear setup — the two sizes are not interchangeable side to side, so match each to its correct axle.
Because the 1973 Plymouth Road Runner predates many current tire lines, confirm this size is still stocked before ordering — some vintage fitments are now served mainly by specialty and classic-car tire suppliers.
Plymouth Road Runner tire sizes by year
- 1974 Plymouth Road Runner 215/75R14
- 1972 Plymouth Road Runner 205/75R14 / 215/75R14
- 1971 Plymouth Road Runner 205/75R14 / 215/75R14
- 1970 Plymouth Road Runner 205/75R14
- 1969 Plymouth Road Runner 205/75R14
- 1968 Plymouth Road Runner 205/75R14
How to read a tire size
A tire size like 225/45R17 breaks down into three parts:
the first number is the section width in millimeters
(the tire's width from sidewall to sidewall), the second is the
aspect ratio — the sidewall's height as a percentage of
that width — and the number after the "R" is the rim
diameter in inches. A letter prefix (P or LT) indicates
Passenger or Light Truck construction; its absence usually means
Euro-metric sizing.
Some trucks and off-road tires instead use "flotation" sizing, like
37X12.50R17 — here the numbers are the tire's overall
diameter and width in inches directly, with the rim diameter last.
Always verify against the tire information placard on your driver's-side door jamb or your owner's manual before purchasing — tire size can vary by factory option package even within the same trim.