1970 MG MGB Tires

The 1970 MG MGB uses three primary tire sizes, depending on sub-model and construction: 165R14, 155R14, and 520-14. The GT Coupe uses 165R14 radial tires, while the Roadster appears with either 155R14 radial tires or 520-14 bias-ply tires. All three sizes are built for 14-inch wheels.

The key is confirming whether the car is a GT Coupe or Roadster, then checking what wheel and tire setup is actually on the car today. Many MGs have seen wheel changes over time, so the correct next step is to match the tire size to the sub-model and verify the wheel width before selecting a product.

The tire fitments used on the 1970 MG MGB are all built around a 14-inch rim diameter. That applies to the 165R14 and 155R14 radial sizes as well as the 520-14 bias-ply size, so the wheel diameter remains consistent even though the tire constructions and widths vary.

Wheel diameter is only part of the fitment picture on an MGB. Width still matters, especially if the car is being moved between a narrow bias-ply tire and a radial tire with a different recommended rim-width range. Checking both the rim diameter and the actual wheel width helps avoid choosing a tire that suits the size code but not the wheel.

More than one tire size appears because the 1970 MG MGB spans different sub-model and construction combinations. The GT Coupe uses 165R14 radial tires, while the Roadster is associated with either a 155R14 radial fitment or a 520-14 bias-ply fitment. The variation is not random; it reflects distinct setups within the same model year.

That means tire selection starts with identifying the exact version of the car and then confirming what wheel and tire arrangement it has now. A restored Roadster may still wear its traditional-style bias-ply size, while another may already be set up for radial use. Matching the new tire to the car’s present configuration is more useful than choosing by model name alone.

520-14 is a bias-ply tire size for the 1970 MG MGB, and it is associated with Roadster applications. It uses the older numeric sizing system rather than the metric radial format seen in 155R14 and 165R14. That distinction matters because the construction, section width, and wheel-width needs differ from the radial choices.

A buyer considering 520-14 should pay close attention to the wheel setup and the kind of presentation the car is meant to have. The available 520-14 products focus on narrow whitewall bias-ply styling, so this size tends to serve a more traditional visual direction rather than the blackwall radial look used elsewhere in the MGB range.

That depends on the exact 1970 MG MGB configuration and the goal for the car. The GT Coupe uses a radial fitment in 165R14, while the Roadster appears with either a 155R14 radial or a 520-14 bias-ply tire. Both constructions belong to this model year, but they serve different setups and visual outcomes.

The practical decision comes down to preserving the car’s present fitment, matching the wheel width, and deciding whether appearance or construction style is the priority. A Roadster owner choosing between 155R14 and 520-14 should confirm which wheel arrangement is on the car now, since moving between radial and bias-ply is more involved than choosing a sidewall style.

A 1970 MG MGB owner considering a move from 520-14 bias-ply tires to a radial setup should first confirm the wheel diameter and actual wheel width, then compare the intended radial size with the car’s present configuration. On this model, the Roadster is the area where that conversion question typically comes up because both constructions appear within the year.

Clearance at the fenders and steering should also be checked once wheel compatibility is confirmed. It is also wise to inspect suspension and steering condition before making the change, since a tired front end can mask or exaggerate fitment issues. The goal is to treat the radial as an alternative setup, not as an automatic one-size swap.

Choosing a 165R14 tire for a 1970 MG MGB starts with confirming that the car is a GT Coupe, since that is the sub-model associated with this size. From there, the meaningful differences are brand, tire series, blackwall presentation, and wheel-width suitability. Pirelli, Michelin, and Vredestein all offer 165R14 options within this vintage radial category.

The best way to narrow the choice is to match the tire to how the car will be used and how closely the owner wants to follow a classic European radial look. Comparing rim-width specifications, load information where available, and the overall character of each tire series will usually tell more than simply picking by brand name alone.

The available sidewall styles for 1970 MG MGB tires are blackwall and narrow whitewall, depending on size and construction. The radial fitments in 165R14 and 155R14 are offered as blackwall tires, while the 520-14 bias-ply products are presented with narrow whitewall styling. That makes sidewall appearance closely tied to the tire size being chosen.

For most buyers, sidewall choice is really part of a broader fitment decision rather than a stand-alone cosmetic one. A GT Coupe buyer looking at 165R14 will be comparing blackwall radials, while a Roadster owner considering 520-14 is also choosing bias-ply construction and a much more traditional visual treatment. Picking the right size comes before picking the sidewall look.

Tires for the 1970 MG MGB are available from Pirelli, Michelin, Vredestein, Firestone, and Premium Sport. The brand mix depends on the size being used: 165R14 includes Pirelli, Michelin, and Vredestein; 155R14 includes Michelin and Firestone; and 520-14 bias-ply options are offered under the Premium Sport name.

Brand selection should follow the correct fitment rather than the other way around. Once the proper size has been confirmed, the buyer can compare each brand’s available tire series, sidewall presentation, and wheel-width details. That approach keeps the search focused on what actually suits the car instead of forcing a favorite brand into the wrong size.

A period-style 1970 MG MGB tire choice starts with the proper fitment for the exact sub-model. The GT Coupe uses 165R14 radial tires, while the Roadster may use either 155R14 radials or 520-14 bias-ply tires. Each one can support a vintage presentation, but they create different visual and construction character on the car.

For a restoration-oriented result, match the tire to the car’s intended setup before focusing on brand or sidewall treatment. If exact originality matters, marque references and car-specific historical documentation are the right tools for narrowing finer details. For most owners, the main decision is whether the car should present as a classic blackwall radial MGB or a more traditional bias-ply Roadster.

Tire construction changes the visual character of a restored 1970 MG MGB in a noticeable way. The radial fitments, 165R14 and 155R14, are offered as blackwall tires and give the car a classic later-vintage sports-car presentation. The 520-14 bias-ply fitment is tied to narrow whitewall offerings, creating a distinctly more traditional look on a Roadster.

That difference means appearance should be considered alongside proper fitment rather than after it. A buyer restoring a GT Coupe will usually be working within the blackwall radial format, while a Roadster owner may be balancing visual tradition against existing wheel setup. Choosing construction first often clarifies the sidewall and series choices that make the finished car look right.

Yes, modifications can affect tire fitment on a 1970 MG MGB even when the tire size itself is correct for the model. Aftermarket wheels, altered wheel widths, suspension changes, or body modifications can all change how a 165R14, 155R14, or 520-14 tire sits in the car. The issue is especially important on a compact sports car with limited space around the tires.

A modified MGB should be checked for wheel diameter, wheel width, and clearance at full steering lock and full suspension movement before a new tire is chosen. Looking only at the original vehicle fitment can miss a change made years ago. A quick physical inspection of the car’s current setup usually prevents the most common fitment mistakes.

Before driving a 1970 MG MGB on new tires, inspect the wheels for correct diameter and condition, confirm that the tire size matches the car’s actual setup, and check that the tires are inflated properly for the application. It is also wise to look over the valve stems, lug hardware, and general wheel seating before heading onto the road.

A collector-era sports car also benefits from a quick inspection of steering and suspension condition, since loose components can affect how the car feels even with fresh tires installed. Clearance around the front wheels should be verified during steering movement, and a short, careful first drive can reveal rubbing, vibration, or air-loss issues before longer use.

Tires on a collector 1970 MG MGB should be maintained with regular pressure checks, visual inspections for cracking, cuts, bulges, and uneven wear, and periodic checks for air loss after the car has been sitting. Low-use vintage cars often accumulate age and storage stress long before they wear out their tread, so condition matters as much as mileage.

Proper storage helps just as much as routine inspection. Keeping the car away from long exposure to sunlight, excessive heat, moisture, and ozone sources can slow sidewall deterioration. It also helps to examine the tires before any longer outing, since a car that sits for extended periods may develop problems that are easy to miss during casual garage storage.