1970 MG Tire Fitment Guide

1970 MG vehicles use four sizes across two model lines. The 1970 MG MGB uses 165R14, 155R14, and 520-14, all of which mount on 14-inch rims. The 1970 MG Midget uses 145R13, which mounts on a 13-inch rim. Where rim-width guidance is available, 165R14 fits 4.0 to 6.0-inch rims depending on brand, 155R14 fits 4.00 to 5.50-inch rims, 520-14 fits 3.50 to 4.00-inch rims, and 145R13 fits 4.00 to 5.00-inch rims.

That means year and make alone are not enough for 1970 MG tire selection. Midget owners need the 13-inch fitment, while MGB owners stay in the 14-inch group and then choose between radial and bias-ply construction. If the car already has wheels on it, verify the wheel diameter and actual rim width before committing to a tire, especially on an MGB that may have changed wheels during restoration or long-term ownership.

On a 1970 MG, 520-14 is a numeric bias-ply size. The 5.20 figure refers to the tire's nominal section width, and the 14 refers to the wheel diameter in inches. Unlike a modern metric radial code, it does not spell out an aspect ratio in the size itself, and the construction is bias-ply rather than radial. For 1970 MG use, this size applies to the MGB rather than the Midget.

That matters because 520-14 is usually chosen for its vintage construction and appearance, not because it is interchangeable with every MG from the same year. An MGB owner considering 520-14 should confirm that the car still uses the narrow 14-inch wheel width that suits this size well. If the goal is a more authentic period presentation, this is the fitment to compare against the MGB's radial alternatives.

No, 1970 MG models do not share one universal tire size. The 1970 MG Midget uses 145R13 on a 13-inch rim, while the 1970 MG MGB uses 165R14, 155R14, or 520-14 on 14-inch rims. The MGB also spans both radial and bias-ply construction, so there is more than one path even within that single model line.

The practical takeaway is simple: identify the model first, then narrow the choice by wheel diameter and construction. That is especially important if the car was purchased already restored, because MGBs may be wearing radial tires today even when an owner wants a more period-style look, and Midgets are on a different wheel diameter altogether.

For a 1970 MG MGB, the choice between 520-14 and a radial size comes down to construction and intended use. The 520-14 is a bias-ply fitment, while 155R14 and 165R14 are radial fitments. Bias-ply tires generally preserve an earlier driving feel and appearance that suits originality-minded restorations, while radial tires are commonly chosen by owners who use their cars more regularly on modern roads.

This is not a choice that applies to every 1970 MG, because the Midget uses 145R13 and stays in radial form. MGB owners should decide first whether the car is being judged, shown casually, or driven often, then compare that goal against the wheel actually on the car. Staying honest to the car's intended use usually leads to a more satisfying tire choice than chasing one style for every situation.

1970 MG tire sidewall styling depends on size. The radial sizes 165R14, 155R14, and 145R13 are available in Blackwall form, while the 520-14 bias-ply size is available with Narrow Whitewall styling. That split is important because the sidewall look changes the car's visual character almost as much as the wheel itself, particularly on a small British sports car with little bodywork around the tire.

For most MG restorations and road cars, Blackwall styling is the more familiar British sports-car look, especially on radial sizes. Narrow Whitewall 520-14 tires push the MGB toward a more stylized period presentation and may suit a particular restoration theme, but they are visually distinct from the standard sporting appearance most enthusiasts expect. If appearance is a major concern, decide on sidewall style at the same time you choose construction.

1970 MG tire coverage includes Pirelli, Michelin, Vredestein, Firestone, and Premium Sport. The 165R14 size is available from Pirelli, Michelin, and Vredestein; 155R14 comes from Michelin and Firestone; 145R13 comes from Michelin and Firestone; and 520-14 is offered by Premium Sport. That gives MGB owners the broadest spread of brand choices, especially in the 14-inch radial category.

Brand selection usually follows the character of the tire rather than the badge alone. European names such as Michelin, Pirelli, and Vredestein often appeal to owners chasing a period European feel on an MG, while Firestone offers classic radial coverage in the narrower metric sizes. Premium Sport serves a different role by covering the MGB's bias-ply whitewall niche, which is more appearance-driven than the Blackwall radial selections.

Rim-width guidance varies by size on 1970 MG vehicles. For the MGB, 165R14 fits rims from 4.0 to 6.0 inches depending on brand, 155R14 fits 4.00 to 5.50 inches, and 520-14 fits 3.50 to 4.00 inches. For the Midget, 145R13 fits 4.00 to 5.00 inches. Those ranges show why tire choice is not only about diameter but also about the wheel's actual width.

A tire can have the correct diameter and still be a poor match if the wheel is too narrow or too wide for the product you choose. This is especially relevant on MGBs, where several 14-inch sizes exist but not all want the same wheel width range. Measure the wheel rather than assuming it is original, particularly if the car has been restored or modified over the years.

Inner-tube status varies by product across 1970 MG tire sizes. In 165R14, Michelin's example is marked TL, while other products in the size are not uniform enough to treat the whole size as one tube category. In 155R14 and 145R13, one product in each size is marked TL while another is not, so those sizes also vary by product. The 520-14 bias-ply options do not present a single universal tube rule at the size level here.

Because tube marking is not consistent across every product in these sizes, the safest approach is to match the tire to the wheel design you are actually using and check the sidewall marking on the specific tire you select. Owners with original-style wheels, older rims, or restored wire-wheel setups should be especially careful, since tube decisions often depend on the wheel as much as the tire itself.

A 1970 MG MGB's 165R14, 155R14, and 520-14 all share a 14-inch rim diameter, so they can be compatible with the same wheel diameter. Diameter, however, is only part of the equation. The radial sizes accept broader rim-width ranges than the 520-14 bias-ply, and 520-14 is best suited to relatively narrow 14-inch wheels.

That means an original MGB wheel may work across more than one size, but you should still verify the wheel's actual width before switching from one construction type to another. If the car has aftermarket or replacement wheels, that check becomes even more important. The right comparison is not just 14-inch versus 14-inch, but 14-inch plus the proper width range for the specific tire.

A stored 1970 MG should be kept in a cool, dry, dark space away from direct sunlight, electric motors, battery chargers, welders, and other ozone sources that accelerate rubber aging. Keep the tires clean, maintain proper inflation, and move the car periodically so one section of tread does not carry the load for months at a time. Bias-ply tires such as the MGB's 520-14 are more prone to flat-spotting during long static storage than radial sizes.

If the car will sit for a season or longer, many collectors either roll it occasionally or support it in a way that reduces sustained load on the tires. A lightweight sports car like a 1970 MG is gentle on tires in use, but long inactivity can still harden the rubber and mar the ride. Good storage habits preserve appearance and driving quality better than any cleaning product ever will.

On a 1970 MG, tire age matters more than mileage for most owners. Collector-car tires are commonly evaluated closely once they reach five to seven years of age, and replacement is often considered around the ten-year mark regardless of how much tread remains. The DOT date code and the tire's overall condition should guide that decision, since a low-mileage MG can still age its tires out simply by sitting.

That age-based approach is important because many 1970 MGs are driven lightly, stored indoors, and still appear to have plenty of usable tread. Sidewall cracking, hardening, and age-related loss of flexibility can appear long before the tread is worn away. If a tire's age is uncertain, checking the date code is more useful than guessing by appearance alone.

Tires on a 1970 MG should be inspected before every drive and again before any longer outing. Look for sidewall cracking, uneven wear, punctures, cuts, bulges, and air loss, and check that the tread is wearing evenly across the contact patch. If the tire or wheel setup uses tubes, valve stems and slow pressure loss deserve extra attention because a lightly used collector car can hide problems between drives.

A brief walkaround catches many issues before they become a roadside problem. Sports cars like the MGB and Midget communicate tire condition clearly through steering feel, so any new vibration, pull, or wandering behavior should trigger a closer inspection. Making tire checks part of your pre-drive routine is one of the simplest ways to protect both the car and the trip.

For a 1970 MG MGB, bias-ply and radial fitment conversations both matter because the era sat in the transition period when radials were increasingly common, especially on European sports cars. The MGB uses 14-inch tire sizes in this coverage, with 520-14 representing the bias-ply path and 155R14 or 165R14 representing radial paths. Original-market details could vary by destination, wheel, and owner history, so construction type is often the first authenticity question to settle.

A careful restoration should start by identifying the car's market, its wheel type, and the standard the car will be judged against. For many owners, choosing a tire that looks and behaves appropriately for the car is enough; for strict originality work, an MG marque club or registry is the best place to confirm market-specific delivery details. That is especially helpful when a car has changed hands or continents over the decades.

Correct tire fitment can matter a great deal when showing a 1970 MG. Judges and knowledgeable enthusiasts often notice whether the size, construction type, and sidewall appearance suit the era and the model. On an MGB, a modern-looking radial choice, a narrow whitewall bias-ply, and a traditional Blackwall radial can each send a very different authenticity message even when they all fit a 14-inch wheel.

The right answer depends on the event. A casual local show may reward overall presentation, while marque judging can be far stricter about whether a tire looks appropriate for a 1970 British sports car. If the car is being prepared for judged competition, review the club standard first and choose the tire after that, not before. That prevents expensive do-overs and keeps the restoration consistent from wheel to roofline.

A 1970 MG Midget belongs to a period when radial tires were closely associated with small European sports cars, and the size used here is 145R13 on a 13-inch rim. That makes the Midget simpler than the MGB at the year-make level because it does not branch into a separate bias-ply size in this coverage. The key authenticity questions are usually the tire's visual character and whether the size remains true to the car's small, light footprint.

For most restorations, staying with the correct 145R13 format preserves the Midget's scale and stance better than forcing a larger modern equivalent. Owners pursuing event-level originality should still verify market-specific expectations with an MG club, especially if the car has non-U.S. history or replacement wheels. Even when the size is straightforward, sidewall appearance and overall profile still influence how authentic the finished car looks.

1970 MG tires can be suitable for highway driving when they are in good condition, correctly inflated, and matched to the car. The radial sizes here include T-rated and H-rated examples, with T carrying a 118 mph ceiling and H carrying a 130 mph ceiling. Those ratings are comfortably above normal U.S. highway speeds. The 520-14 bias-ply option for the MGB should be approached as a vintage-style construction choice, with the different handling feel and response that bias-ply tires naturally bring.

On a 1970 MG, the car's overall mechanical condition often matters more than the speed symbol alone. Brakes, suspension, steering, and wheel condition deserve the same attention as the tires before sustained road use. A well-sorted MG on fresh, appropriate tires can be an enjoyable highway car, but the best practice is to treat the tire as one part of the car's larger roadworthiness picture.

Inflation pressure on a 1970 MG should follow the vehicle's factory guidance first, then stay within the individual tire's stated limits. Among these sizes, 165R14 appears with a maximum load of 1,102 pounds at 51 psi on one product, 155R14 appears with 990 pounds at 44 psi on one product, 520-14 appears with 1,230 pounds at 60 psi on some products, and 145R13 appears with 825 pounds at 44 psi on one product. Those figures are load-and-pressure maxima, not universal running pressures for every MG.

The important point is not to transfer one tire's number to a different size or construction. A light British sports car often uses lower operating pressures than the maximum printed on the sidewall, and the correct setting depends on the car, axle load, and tire chosen. Use the owner's manual or marque reference for the starting pressure, then confirm that your chosen tire's rating supports that use.

Before a longer drive in a 1970 MG, inspect each tire for cracking, cuts, bulges, embedded debris, uneven wear, and proper inflation, and do not forget the spare. Check valve stems carefully, especially if the tire and wheel combination may involve tubes, and make sure the car is not carrying an aged spare that looks serviceable but has timed out. A quick tread and sidewall check takes only a few minutes and can prevent a spoiled trip.

Longer drives also justify a broader mechanical check because a 1970 MG is an older sports car, not simply a modern commuter with classic looks. Wheel hardware, steering feel, brake function, cooling condition, and fluid levels should all be part of the same routine. The more miles you plan to cover, the more important it is to confirm that the tires and the rest of the car are working as one system.