How big of a tire can fit on a 20 inch rim?
On a 20-inch rim, the largest tire you can run depends on the wheel width and the car’s clearance. In typical street setups, you’ll see tires up to about 315–335 mm wide on 10–11 inch-wide 20-inch wheels.
Understanding tire fitment starts with recognizing that the 20-inch measurement refers to the wheel diameter, while the tire’s width is determined by the wheel width, brake clearances, suspension geometry, and fender space. Tire manufacturers publish exact rim-width ranges for each tire size, and exceeding those ranges can affect safety and performance. This article outlines the main factors, provides practical ranges by common 20-inch wheel widths, and offers steps to verify fit for your vehicle.
What determines fit on a 20-inch rim
The key variable is the rim width—the inside measure of the wheel where the tire bead sits. The tire’s section width must fall within the tire maker’s recommended rim-width range for that tire. Other critical factors include brake caliper clearance, suspension travel, and fender clearance. Even two wheels described as “20 inches” can require very different tires depending on their width and offset.
Typical tire sizes by common 20-inch rim widths
Below are practical ranges used on modern street cars. They reflect typical pairing of tire width to common 20-inch wheel widths. Always verify with the tire maker for your exact model and rim width.
- Rim width around 8.5–9 inches: tire widths roughly 235–255 mm. Example sizes: 235/40R20, 245/40R20, 255/35R20.
- Rim width around 9–9.5 inches: tire widths roughly 255–275 mm. Example sizes: 255/40R20, 275/40R20.
- Rim width around 10 inches: tire widths roughly 275–315 mm. Example sizes: 275/40R20, 285/40R20, 305/35R20, 315/35R20.
- Rim width around 11 inches: tire widths roughly 305–335 mm. Example sizes: 315/35R20, 325/35R20, 335/30R20.
The ranges above cover common street configurations. Some setups with very wide wheels or specific high-performance tires can use wider sizes, but you should always confirm with the tire manufacturer’s official rim-width recommendations and check for adequate brake and fender clearance.
How to verify fit for your vehicle
To avoid fitment problems, follow these steps before buying wheels or tires:
- Check the factory tire size and the vehicle’s owner’s manual for recommended wheel and tire sizes.
- Consult the tire manufacturer’s official rim-width chart for the exact tire you plan to use.
- Measure clearance around the front and rear tires, including brake calipers, suspension components, and fender space.
- Use a fitment tool or online calculator from tire retailers to simulate different sizes on your exact wheel width and offset.
- Consult a qualified tire shop or wheel specialist if you plan a significant width change or fender work.
Note that going wider can affect speedometer accuracy, ride quality, and the vehicle’s handling balance. In some cases, you may need to roll fenders, adjust suspension, or alter offset to achieve the desired fit.
Summary
Big tires on a 20-inch rim are possible, but they depend on the wheel width and proper clearance. In practice, most street setups cap around 315–335 mm wide tires on rims about 10–11 inches wide, with common sizes including 275/40R20, 285/40R20, 305/35R20, and 315/35R20. Always rely on the tire maker’s fit charts and professional guidance to ensure a safe, legal, and balanced configuration.
What size tires can you fit on a 20 inch rim?
20" Options
- 145/60-20.
- 145/65-20.
- 155/60-20.
- 175/55-20.
- 195/50-20.
- 215/45-20.
- 225/30-20.
- 225/35-20.
Can you put 35 inch tires on 20 inch rims?
Yes, you can put 35-inch tires on 20-inch rims, and many people do. However, be prepared for potential issues like rubbing, especially on a stock suspension, which may require modifications like a lift kit or fender trimming. There will be a less aggressive "sidewall" with this combination compared to a smaller wheel, and the weight difference may affect vehicle performance and fuel economy.
Things to consider:
- Vehicle modifications: A lift kit is often necessary to provide enough clearance for the larger tires, though some specific vehicle models may have exceptions.
- Rubbing: Even with modifications, the tires might rub under certain conditions, such as turning sharply or off-roading, which could require additional trimming or spacers.
- Performance and handling: Expect a potential increase in weight, which can make the vehicle feel more sluggish and reduce fuel efficiency. A speedometer recalibration is also needed to ensure accurate speed readings.
- Off-roading: Larger wheels with less sidewall provide less protection to the wheel itself from impacts. They also have a reduced ability to air down for better traction compared to a smaller wheel size.
- Sidewall: A 20-inch wheel will result in a smaller sidewall compared to a 17-inch or 18-inch wheel with the same 35-inch tire height. Some off-road enthusiasts prefer more sidewall for off-road performance.
Can you put 22 inch tires on 20 inch rims?
No, you cannot put 22-inch tires on 20-inch rims because the tire is a completely different size than the rim it is designed for. The rim size refers to the diameter of the wheel, so a 22-inch tire is designed for a 22-inch rim, not a 20-inch one. To use 22-inch tires, you would need 22-inch rims that have the correct bolt pattern and offset for your vehicle.
- Wheel size: The "20 inch" or "22 inch" specification is the diameter of the rim itself. A tire must be matched to the rim's diameter to fit correctly.
- Matching components: You will need a 22-inch rim with the correct bolt pattern and offset for your car's hubs.
- Tire characteristics: To upgrade from 20-inch to 22-inch rims, you must choose tires that keep the overall diameter of the wheel and tire assembly the same as the original equipment (OE) setup to avoid issues with your speedometer, odometer, and other vehicle systems.
- Tire and rim packages: Many companies offer pre-mounted and balanced wheel and tire packages that can simplify the process of upgrading.
What size tires are 33s on a 20 inch rim?
A 33-inch tire on a 20-inch rim is most commonly labeled as a 33x12.50R20 in the flotation size system, or approximately a 305/55R20 or 275/60R20 in the metric system. The exact size depends on the manufacturer and the tire's specific construction.
Common sizes
- 33x12.50R20: This is a flotation size that directly indicates a 33-inch outer diameter, a 12.50-inch section width, and a 20-inch wheel diameter.
- 305/55R20: This is a common metric equivalent that is approximately 33 inches in diameter and fits a 20-inch rim.
- 275/60R20: Another metric size that is very close to 33 inches in overall diameter and is a frequent option for 20-inch wheels.
Important considerations
- Actual vs. advertised diameter: Tire manufacturers may have slightly different specifications, so a 33-inch tire from one brand could be a slightly different actual size than another.
- Metric conversions: While the metric sizes provide a close approximation, they are not always exact. It's best to check the manufacturer's specifications for the specific tire you are considering.
