1963 MG Tire Fitment Guide

1963 MG vehicles use seven sizes spread across four models. The MG 1100 uses either 145R12 radial or 5.50-12 bias-ply on 12-inch wheels. The MG model uses 165R14 radial or 5.90-14 bias-ply on 14-inch wheels. The MGB uses 165R14 radial or 560-14 bias-ply on 14-inch wheels. The Midget uses 145R13 radial or 520-13 bias-ply on 13-inch wheels. Rim width guidance is available for some sizes, including 165R14 at 4.0 to 6.0 inches depending on product, 560-14 at 3.50 to 4.00 inches, 145R13 at 4.00 to 5.00 inches, and 520-13 at 3.5 to 4.00 inches depending on product.

The practical takeaway is that year and make are only the starting point for a 1963 MG. You need to identify the exact model first, because each one points to a different wheel diameter and size family. Once the model is confirmed, the next choice is usually between a period-style bias-ply tire and a radial alternative that fits the same basic wheel diameter for that model.

On a 1963 MG, 145R12 is a Euro-metric radial size. The 145 refers to a nominal section width of 145 millimeters, the R identifies radial construction, and the 12 is the wheel diameter in inches. In period-style metric sizing without an explicitly printed aspect ratio, the profile is conventionally treated as an 80-series radial. On 1963 MG applications, that size belongs to the MG 1100.

That decoding matters because 145R12 is not interchangeable with the 13-inch or 14-inch sizes used elsewhere in the 1963 MG range. It also points you toward a different driving character than a bias-ply size on the same model. If your goal is a radial-equipped 1100, 145R12 is the modern-format size to verify against the wheel before moving on to a specific product choice.

No. 1963 MG models do not share one common tire size across the entire make. The 1100 uses 12-inch sizes, the Midget uses 13-inch sizes, and the MG and MGB use 14-inch sizes. Even within the 14-inch group, the radial size 165R14 is shared by the MG and MGB, while the bias-ply sizes split into 5.90-14 for the MG and 560-14 for the MGB.

That means a 1963 MG owner should avoid choosing only by year and brand identity. The body style and model family directly affect the wheel diameter and the correct size format. Once you know whether you have an 1100, MG, MGB, or Midget, the size picture becomes much clearer and you can decide whether radial or bias-ply construction matches the way you intend to use the car.

For many 1963 MG models, the choice is less about basic fitment than about how you want the car to feel and present. The 1100, MG, MGB, and Midget each have a radial option and a bias-ply option within their model-specific wheel diameter. Radials such as 145R12, 165R14, and 145R13 are typically chosen by owners who want more modern road manners, while bias-ply sizes such as 5.50-12, 5.90-14, 560-14, and 520-13 speak more directly to period-correct restoration goals.

A car built for concours presentation or faithful factory-era character usually pushes the decision toward bias-ply construction. A car driven more often on present-day roads often points buyers toward the radial alternative for that same model. The key is to make the construction decision after the model is identified, because the radial and bias-ply sizes are not shared across the full 1963 MG range.

1963 MG tire choices include both blackwall and whitewall sidewall treatments, depending on size. The radial sizes 145R12, 165R14, and 145R13 appear as blackwalls. The MGB's 560-14 bias-ply size is available as blackwall, narrow whitewall, and wide whitewall, while the Midget's 520-13 bias-ply size appears in blackwall and narrow whitewall versions. That creates a broader appearance range on the bias-ply side than on the radial side.

Most British sports-car restorations from this era lean naturally toward blackwall presentation, especially when the goal is an authentic factory-market look. Whitewall choices can still be appealing for a personalized restoration or a market-specific style preference, particularly on cars being built with a more custom visual direction. If authenticity is important, match the sidewall treatment to the car's intended presentation before narrowing the brand or series.

1963 MG tire coverage comes from Michelin, Pirelli, Vredestein, BFGoodrich, Firestone, and Premium Sport. Michelin covers 145R12 and also appears in 165R14 and 145R13. Pirelli and Vredestein both offer 165R14 radial choices. BFGoodrich covers 560-14 bias-ply, while Firestone and Premium Sport cover the 13-inch Midget sizes in different constructions and sidewall treatments.

That brand mix gives a 1963 MG owner several different paths depending on the model and the goal for the car. European-branded radial options suit buyers trying to stay close to the look and feel of a vintage sports-car tire, while domestic-style bias-ply and whitewall offerings broaden the visual choices on some sizes. Brand choice comes after confirming the correct model-specific size, not before.

Rim width depends on the exact size chosen for the 1963 MG. The 165R14 radial is suited to rims from 4.0 to 6.0 inches wide depending on brand, the 560-14 bias-ply fits 3.50 to 4.00-inch rims, the 145R13 radial fits 4.00 to 5.00-inch rims, and the 520-13 bias-ply appears on 3.5-inch or 3.50 to 4.00-inch rims depending on product. The 145R12 radial appears with a 4.5-inch rim reference.

That spread is exactly why wheel verification matters before choosing between products in the same nominal size. Two tires that share the same diameter code may still favor different wheel widths. If your car has original wheels, measure or confirm their width before ordering, especially when switching from a bias-ply size to a radial alternative within the same model family.

Inner-tube use on 1963 MG tires depends on the specific size and product. The 145R12 Michelin MX is marked tubeless, and the Michelin XAS FF in 145R13 is also marked tubeless. Within 165R14, tube status varies by product because some versions are explicitly marked TL while others are not. The bias-ply products shown here do not carry a consistent tube marking across every option, so tube practice should be confirmed against the tire itself and the wheel design being used.

The important point is that tube choice is not something to assume from the year alone. Original wheel construction, rim condition, and the exact tire selected all influence the right setup. If you are using original steel wheels or restoring a car for correctness, confirm the sidewall marking and the wheel type together before installation rather than relying on a blanket rule for all 1963 MG models.

In many 1963 MG applications, the radial and bias-ply alternatives for the same model share the same wheel diameter. The 1100's 145R12 and 5.50-12 both use 12-inch wheels, the MG's 165R14 and 5.90-14 both use 14-inch wheels, the MGB's 165R14 and 560-14 both use 14-inch wheels, and the Midget's 145R13 and 520-13 both use 13-inch wheels. That makes diameter compatibility straightforward within each individual model.

Wheel diameter alone is not the whole story, though. Rim width still needs to match the tire you choose, and some radial products call for a broader acceptable rim-width range than their bias-ply counterparts. Original wheels can often stay in service when moving between the two constructions, but the final check should always be the wheel's actual width and condition for the exact tire under consideration.

A stored 1963 MG should be kept away from direct sunlight, electric motors, battery chargers, welders, and other ozone-producing equipment that can age rubber prematurely. Clean, dry flooring and stable temperatures also help protect the tires. If the car will sit for long periods, moving it occasionally or placing it on stands can reduce the tendency toward flat-spotting. That matters especially with bias-ply tires, which usually develop temporary flat spots more readily in storage than radials.

Collector cars often spend more time parked than driven, so storage habits play a larger role than mileage in overall tire condition. Keep the tires properly inflated during storage and inspect the sidewalls every few months for early cracking or weathering. If your 1963 MG alternates between show use and seasonal drives, good storage practice can preserve both appearance and ride quality for much longer.

On a 1963 MG, tire life should be judged more by age and condition than by tread wear alone. A collector car can accumulate very little mileage while the rubber still hardens with time. A sensible rule is to begin evaluating tires closely around five to seven years of age and to treat the ten-year mark as a serious replacement consideration, regardless of remaining tread. The DOT date code on the tire is the starting point for that age check.

That age-based approach is especially important on vintage sports cars that may feel fine at moderate speeds right up until old rubber reveals a weakness. Sidewall cracking, recurring air loss, vibration that does not balance out, or visible separation are all stronger warning signs than low tread depth on a lightly used car. When in doubt, age and condition should outweigh appearance alone.

Tires on a 1963 MG should be inspected before every drive and again before any extended outing or touring event. Check inflation, sidewall cracking, cuts, bulges, uneven wear, and objects embedded in the tread. On cars using tube-type setups, inspect valve stems and look for signs of slow leakage or stem deterioration as part of the same routine. A spare tire deserves the same attention, especially on a vintage car that may rely on it far from home.

Frequent inspection matters because many classic cars spend long intervals parked, and storage-related issues can appear between drives. A quick walkaround catches problems early and is often more valuable than waiting for an annual service visit. On a light British sports car, even a small pressure loss can change the way the car feels on the road, so regular checks are part of basic drivability as well as safety.

For a 1963 MG 1100, period-correct thinking starts with bias-ply construction, since bias-ply tires were still the standard fitment type across much of the industry in this era even as radial adoption was growing. The two size paths associated with the 1100 are 5.50-12 in bias-ply form and 145R12 in radial form, both on 12-inch wheels. The exact original market fitment can vary by destination market and production details, so size and construction matter more than chasing an assumed brand name.

For a restoration, the safest approach is to treat 5.50-12 as the most era-faithful direction unless you have a market-specific reason to pursue the radial alternative. If the car is being judged, the right combination of size, construction, and sidewall treatment can matter as much as the tread itself. Marque specialists and MG clubs are the best next stop for market-specific confirmation when originality is the goal.

Yes, tire fitment can matter noticeably when a 1963 MG is judged for authenticity. Judges and knowledgeable enthusiasts often notice whether the car wears the correct size family, the right construction type for its restoration approach, and an era-appropriate sidewall style. A radial on a car restored to strict factory-original standards may draw attention, and an obviously non-period whitewall treatment can do the same if the car is meant to reflect a standard British-market presentation.

The good news is that authenticity is not the same thing as one universal answer for every car. A driver-focused restoration can justify different choices than a concours build, and some events are more flexible than others. If show goals are part of the plan, confirm the event's judging standards first, then match your 1963 MG's tires to those expectations instead of assuming every authentic-looking vintage tire will be scored the same way.

For a 1963 MG using 165R14, Michelin XAS and Vredestein Sprint Classic are both blackwall radial options, but they differ in their published details. The Michelin XAS carries an H speed rating and is marked tubeless, with a rim-width range of 4.50 to 6.00 inches. The Vredestein Sprint Classic also carries an H speed rating, has a rim-width range of 4.0 to 5.5 inches, weighs less at 16 pounds, and shows a max load capacity of 1,102 pounds at 51 psi.

Those differences help narrow the choice once the size itself is confirmed. If your wheel width sits toward the narrower end of the range, the Vredestein figures may be especially relevant, while the Michelin spans slightly farther on the wider side. Both stay within the same classic 165R14 radial category, so the final decision should center on wheel width, intended use, and which overall tire character best suits your MG or MGB.

1963 MG tires can be suitable for highway driving when the tire's condition, construction, and speed rating match the way the car is used. The radial 165R14 choices include H-rated versions with a 130 mph ceiling, and the 145R12 Michelin MX carries an S rating with a 112 mph ceiling. Bias-ply options do not show the same speed-letter information here, so they should be treated with the normal caution appropriate to vintage construction and the car's intended use.

In real-world driving, the mechanical condition of a 1963 MG often matters as much as the tire itself. Brakes, suspension, steering, wheel bearings, and alignment all shape how relaxed the car feels at sustained speed. Highway use is usually less about chasing the highest possible rating and more about making sure the entire car, including the tires, is fresh, properly inflated, and suited to the pace you actually intend to maintain.

Inflation pressure on a 1963 MG should not be guessed across all models and sizes. Several tires carry their own load-and-pressure figures, including 560-14 at 906 pounds at 30 psi, 145R13 Firestone at 825 pounds at 44 psi, 520-13 Firestone at 770 pounds at 32 psi, 520-13 Premium Sport at 1,100 pounds at 60 psi, and 165R14 Vredestein at 1,102 pounds at 51 psi. Those numbers describe the tire's rated capacity at a given pressure, not necessarily the carmaker's recommended running pressure.

For actual service pressure, start with the factory recommendation for your exact 1963 MG model and compare it with the tire manufacturer's guidance for the tire you are using. Do not transfer one pressure figure from a 13-inch Midget tire to a 14-inch MGB tire, or from a radial to a bias-ply size. Correct inflation depends on the exact combination of car, size, construction, and wheel.

Before a longer trip in a 1963 MG, inspect each tire for sidewall cracking, tread cuts, bulges, uneven wear, and signs of age-related hardening. Confirm cold inflation pressure, check that each wheel is secure, and make sure the spare is usable and inflated. If the car uses a tube-type arrangement, inspect valve stems carefully and pay attention to any history of slow pressure loss. The tires should be part of a broader check that also includes brakes, fluids, cooling, and lighting.

Longer drives put a sustained load on an older car in a way that short local outings often do not. A tire that seems acceptable on brief trips can reveal vibration, heat buildup, or air-loss problems over distance. Taking ten extra minutes for a proper pre-drive inspection usually matters more on a vintage MG than carrying extra speed, and it often prevents the sort of roadside interruption that overshadows an otherwise enjoyable run.