The 1973 Mercury Montego came from a period when midsize American cars had grown into roomy, comfortable cruisers offered in coupes, sedans, wagons, and more upscale Brougham trims. That broad lineup makes tire fitment on the 1973 Mercury Montego more configuration-specific than a quick glance might suggest, with 14-inch and 15-inch applications and both bias-ply and radial fitments appearing across the range. Primary sizes include F78-14, G78-14, H70-14, H78-14, J78-15, JR78-15, and HR78-14, depending on sub-model. Available choices also vary by sidewall treatment and tire series, so the right selection starts with confirming the exact Montego version, wheel diameter, and whether a restoration-minded bias-ply look or a radial alternative suits the car’s intended use.
Which Tire Size Is Right for The 1973 Mercury Montego
The 1973 Mercury Montego uses seven primary tire sizes across its various sub-models, and the differences involve both construction type and rim diameter. Some versions stay with 14-inch bias-ply fitments, while others introduce 15-inch applications or radial sizing. The first step is identifying the exact Montego sub-model and confirming whether the car is on a 14-inch or 15-inch wheel before choosing a tire.
Fit(s): 4 Dr. w/400 Eng., GT w/429 Eng., and w/429 Eng.
Construction: Bias Ply|Rim: 14 in
H70-14 is a vintage alphanumeric bias-ply size in which the letter indicates the tire’s size class, the series number identifies its profile family, and the 14 denotes a 14-inch rim. On the 1973 Mercury Montego, this is a bias-ply fitment tied to specific configurations rather than the whole model line. It supports a period-style selection path for owners who want to stay with traditional construction. Before choosing it, make sure the car’s exact sub-model and wheel setup call for H70-14 rather than one of the more common G78-14 or H78-14 sizes.
H78-14 is a vintage alphanumeric bias-ply size, with the H designating the size class, 78 identifying the profile family, and 14 indicating a 14-inch wheel. It appears across a wide range of 1973 Mercury Montego sub-models and is one of the most central sizes in the lineup. Available choices include a Coker Classic Bias Ply option with a wide whitewall presentation, making it relevant for buyers focused on traditional appearance. It is also one of the Montego’s key sizes for radial-equivalent comparison, so it can anchor either a restoration-oriented bias-ply choice or a carefully checked radial alternative.
G78-14 uses the same vintage alphanumeric bias-ply sizing system, where the initial letter marks the tire class, the 78 indicates the profile family, and the final 14 is the rim diameter. For the 1973 Mercury Montego, this size appears on several sub-models and brings the broadest visible product variety among the available 14-inch bias-ply choices. BFGoodrich and Coker Classic offerings include narrow whitewall, dual-white-stripe, and wide whitewall styles across Silvertown Classic Bias Ply and Coker Classic Bias Ply lines. That makes G78-14 especially important when the goal is balancing correct fitment with a specific period-style sidewall look.
J78-15 is a vintage alphanumeric bias-ply size, with the J indicating a larger size class, the 78 defining the profile family, and the 15 showing that it mounts on a 15-inch rim. On the 1973 Mercury Montego, it belongs to specific 15-inch applications and should not be confused with the more common 14-inch fitments used elsewhere in the range. Available BFGoodrich options include dual-white-stripe and narrow whitewall versions in the Silvertown Classic Bias Ply series. This size matters most on Montegos that already have the correct 15-inch wheel diameter and need a bias-ply tire with a traditional full-size American-car presentation.
JR78-15 is an alphanumeric radial size, where the R marks radial construction within the vintage alphanumeric sizing format and the 15 denotes a 15-inch wheel. For the 1973 Mercury Montego, it appears as a primary radial fitment on a specific 15-inch sub-model rather than as a broad replacement across the line. Its role is important for owners who want to keep a Montego configured around a period radial application instead of converting from a bias-ply size. The key step is confirming that the car’s sub-model and wheel diameter actually call for JR78-15, since 15-inch fitment is not universal across Montegos.
HR78-14 is an alphanumeric radial tire size in which the R identifies radial construction and the 14 specifies a 14-inch rim. On the 1973 Mercury Montego, this size is tied to a wagon application and stands apart from the many 14-inch bias-ply sizes used on other Montego versions. Its significance is less about sidewall-style variety and more about preserving the correct construction type for the specific configuration that uses it. Buyers should verify that the vehicle is the appropriate wagon fitment and not assume that any 14-inch Montego automatically takes HR78-14 simply because the rim diameter matches.
F78-14 is a vintage alphanumeric bias-ply size, with the F identifying the tire class, the 78 indicating the profile family, and the 14 referring to the rim diameter. On the 1973 Mercury Montego, it is a narrower 14-inch bias-ply fitment associated with a specific engine application, not the full Montego range. Coker Classic offers this size in a Coker Classic Bias Ply version with a wide whitewall sidewall treatment, giving it a traditional restoration-oriented look. It is also one of the Montego sizes with clearly defined radial-equivalent options, so it deserves a careful wheel and clearance check if construction changes are being considered.
Sub-model fitment on the 1973 Mercury Montego varies widely, so tire choice depends on confirming the exact version of the car before anything else. Some Montegos share common 14-inch bias-ply sizes, while others move into 15-inch fitments or primary radial applications.
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1973 Mercury Montego 4 Dr. w/400 Eng.
This Montego 4-door uses H70-14 or H78-14 bias-ply sizing, so the decision starts with confirming which of those two 14-inch applications matches the car. That distinction affects whether the buyer stays with a traditional bias-ply presentation or evaluates radial equivalents tied specifically to H78-14.
This Base configuration uses either G78-14 or H78-14 bias-ply tires on 14-inch wheels. Tire selection here centers on confirming the exact size first, then choosing among the available period-style sidewall treatments and product series that suit the car’s appearance and use.
This Montego GT application also falls into the G78-14 or H78-14 bias-ply range. Once the correct size is confirmed, the next step is deciding whether the goal is a more restrained whitewall look, a dual-stripe presentation, or a different approach through a radial-equivalent option where available.
The 429-powered GT uses H70-14 or H78-14 bias-ply tires, making exact size confirmation especially important before comparing products. That choice influences whether the owner stays with a traditional bias-ply setup or considers the radial-equivalent path available for H78-14.
This MX Brougham 4-door is straightforward because it uses H78-14 bias-ply tires. With the size question simplified, the selection focus shifts toward preserving a traditional look or comparing H78-14 against its radial-equivalent alternatives for road use.
This MX Brougham setup uses either G78-14 or H78-14 in bias-ply form, so the exact car still needs to be checked before choosing a tire. After that, sidewall appearance and whether to remain with bias-ply construction become the main buying decisions.
This MX Brougham configuration is one of the key 15-inch applications, using either J78-15 bias-ply or JR78-15 radial sizing. That makes wheel diameter and construction type central to the purchase, since a 15-inch Montego tire choice here is not interchangeable with the 14-inch Montego fitments.
This Montego MX uses G78-14 or H78-14 bias-ply tires on 14-inch wheels. The practical decision is confirming the exact size first, then comparing the available sidewall styles and overall presentation that best match the car’s intended character.
This wagon application can use H78-14 bias-ply or HR78-14 radial fitment, making construction an important part of the decision as well as size. Buyers should confirm which setup the wagon is built around before choosing between a traditional bias-ply route and a primary radial tire in the corresponding 14-inch format.
These wagon versions use G78-14 or H78-14 bias-ply tires, both on 14-inch wheels. The key is determining the exact size on the vehicle, then selecting the sidewall treatment and period-style product character that best suit a wagon restoration or driver-focused presentation.
The Montego with the 250 engine uses either F78-14 or G78-14 bias-ply sizing. That makes the tire choice less about construction changes and more about confirming the correct 14-inch size before comparing whitewall styles or reviewing the radial-equivalent route tied to F78-14.
This 429-equipped Montego uses H70-14 or H78-14 in bias-ply construction. Once the correct size is established, the owner can focus on whether to keep a restoration-oriented bias-ply look or explore the radial-equivalent path that exists for H78-14.
Bias-Ply to Radial Tire Conversion for the 1973 Mercury Montego
Several 1973 Mercury Montego bias-ply sizes have radial-equivalent options. H78-14 can be compared with 215R14 as an 80-series metric radial, P225/75R14 as a 75-series P-metric radial, and P235/70R14 as a 70-series P-metric radial. G78-14 adds 205R14, P215/75R14, P225/70R14, and the 800R14 bias-look radial, while J78-15 and F78-14 also have metric, P-metric, and bias-look radial alternatives. Recommended rim-width ranges run from 4-6 inches for F78-14, 5-7 for G78-14 and H78-14, and 6-8 for J78-15, so wheel width and clearance should be checked before changing sizes or construction.
Modern Radial Equivalents
215R14
Equivalent 80-series Metric Radial (H78-14)
P225/75R14
Equivalent P-metric 75-series Radial (H78-14)
P235/70R14
Equivalent P-metric 70-series Radial (H78-14)
205R14
Equivalent 80-series Metric Radial (G78-14)
P215/75R14
Equivalent P-metric 75-series Radial (G78-14)
P225/70R14
Equivalent P-metric 70-series Radial (G78-14)
800R14
Bias-look Radial Equivalent (G78-14)
225R15
Equivalent 80-series Metric Radial (J78-15)
P235/75R15
Equivalent P-metric 75-series Radial (J78-15)
P235/70R15
Equivalent P-metric 70-series Radial (J78-15)
800R15
Bias-look Radial Equivalent (J78-15)
195R14
Equivalent 80-series Metric Radial (F78-14)
P205/75R14
Equivalent P-metric 75-series Radial (F78-14)
P215/70R14
Equivalent P-metric 70-series Radial (F78-14)
750R14
Bias-look Radial Equivalent (F78-14)
Important Considerations When Replacing Bias Ply With Radial
Compare overall diameter and section width carefully to ensure proper fit.
Verify recommended rim range (4-6 in) and load needs match your vehicle specifications.
Check fender clearance, steering clearance, and stance before installation.
Consider suspension condition and intended road use when choosing equivalents.
Important Fitment Notes
The tire sizes listed on this page assume factory-standard vehicle configuration. The following modifications may affect tire fitment and are not reflected in this guide:
Suspension changes (lowering, lift kits, spring replacements)
Body alterations (fender modifications, custom bodywork)
If your vehicle has been modified from factory specifications, verify tire clearance before purchase.
Best 1973 Mercury Montego Tires for Sale
Available 1973 Mercury Montego tire choices center on bias-ply offerings in G78-14, H78-14, J78-15, and F78-14 from BFGoodrich and Coker Classic. The product grid highlights meaningful differences in tire series and sidewall style, including wide whitewall, narrow whitewall, and dual-white-stripe presentations.
Owners researching 1973 Mercury Montego tires usually need to sort out the exact size by sub-model first, then compare bias-ply versus radial choices, sidewall appearance, wheel fitment, and the basic inspections worth making before regular road use.
Tire Size & Fitment
What tire size fits a 1973 Mercury Montego?
The 1973 Mercury Montego does not use one universal tire size across the full model range. Primary sizes include F78-14, G78-14, H70-14, H78-14, J78-15, JR78-15, and HR78-14, depending on the exact sub-model, engine grouping, and whether the application is bias-ply or radial.
That means the right starting point is identifying the exact Montego version rather than choosing by make and model alone. Wheel diameter matters as well, because the Montego range includes both 14-inch and 15-inch applications. A car that has been changed over to different wheels should be checked carefully before selecting a replacement tire.
What size rim does a 1973 Mercury Montego use?
A 1973 Mercury Montego can use either a 14-inch or 15-inch rim, depending on the specific sub-model and tire size. Most Montego applications in this range are 14-inch, while certain configurations use 15-inch sizes such as J78-15 or JR78-15.
The rim diameter should be confirmed before comparing tires, because a 14-inch Montego size and a 15-inch Montego size are not interchangeable. It is also wise to verify the actual wheel on the car, especially if it has aftermarket wheels or a long ownership history. Correct diameter is the first filter before looking at construction, sidewall style, or radial equivalents.
Why does the 1973 Mercury Montego have more than one tire size?
The 1973 Mercury Montego was offered in many forms, including sedans, wagons, GT models, MX models, and Brougham versions, and those configurations do not all share the same tire fitment. Some use different 14-inch bias-ply sizes, while others move to 15-inch applications or primary radial sizes.
That variation is why tire selection should follow the exact sub-model rather than a broad Montego description. A wagon, a GT, and an MX Brougham can lead to different tire decisions even within the same model year. Checking the sub-model name and existing wheel setup prevents choosing a size that belongs to another Montego configuration.
Bias-Ply & Radial Options
Should I use bias-ply or radial tires on a 1973 Mercury Montego?
A 1973 Mercury Montego can involve both approaches, depending on the exact application. Many Montego sub-models use bias-ply sizes such as F78-14, G78-14, H70-14, H78-14, or J78-15, while some applications use primary radial sizes such as HR78-14 or JR78-15. Several bias-ply sizes also have radial-equivalent alternatives.
The choice depends on the car’s present wheel setup, the sub-model’s original fitment pattern, and the owner’s priorities. Bias-ply tires maintain a more traditional look and period feel, while radial alternatives can be considered when the goal is different road manners. Any construction change should include a check of wheel width, overall tire dimensions, and clearance at full steering lock and suspension movement.
What radial tire sizes are equivalent to H78-14 on a 1973 Mercury Montego?
For an H78-14 application on a 1973 Mercury Montego, radial equivalents include 215R14 as an 80-series metric radial, P225/75R14 as a 75-series P-metric radial, and P235/70R14 as a 70-series P-metric radial. The recommended rim-width range for these comparisons is 5 to 7 inches.
Those options give the buyer a few different sizing conventions rather than one automatic replacement. The 215R14 stays in a more traditional metric format, while the P-metric choices represent different profile families. Before moving from H78-14 bias-ply to any radial equivalent, confirm the actual wheel width on the car and inspect for fender, suspension, and steering clearance.
Can I use a bias-look radial on a 1973 Mercury Montego?
A bias-look radial can be considered on certain 1973 Mercury Montego applications where one is available as an equivalent. G78-14 has an 800R14 bias-look radial equivalent, J78-15 has an 800R15 bias-look radial equivalent, and F78-14 has a 750R14 bias-look radial equivalent.
That type of tire is useful when the goal is to retain a more traditional visual presentation while exploring a radial-format alternative. It still needs to be treated as an equivalent, not as an automatic swap. Wheel width, tire dimensions, and clearance should be checked carefully, especially on a Montego that has replacement wheels, suspension changes, or mixed front and rear setups.
Choosing the Right Tire
What should I consider when choosing a 1973 Mercury Montego tire?
Start with the exact sub-model and wheel diameter, because the 1973 Mercury Montego spans several primary sizes and both 14-inch and 15-inch applications. Construction also matters, since some Montegos use bias-ply sizes while others use primary radial sizes or have radial-equivalent paths available for certain bias-ply fitments.
Once the correct size is confirmed, compare the details that shape the final choice: sidewall style, tire series, rim-width compatibility, load figure at the stated pressure, and the overall look the car needs. A restoration-minded sedan or wagon may call for a different presentation than a driver-focused GT. Tire selection works best when fitment, appearance, and intended road use are balanced together.
What sidewall styles are available for 1973 Mercury Montego tires?
Available sidewall styles for 1973 Mercury Montego tires include wide whitewall, narrow whitewall, and dual-white-stripe treatments, depending on the size. G78-14 offers the widest visible variety, while H78-14, J78-15, and F78-14 also have whitewall-based options in the correct size families.
Sidewall style is often the detail that changes the character of the car more than the size code itself. A wide whitewall gives a more formal, traditional appearance, while narrow whitewall and dual-white-stripe choices can create a different period-style look. The best choice depends on the specific Montego configuration and how original, personalized, or restrained the finished car is meant to appear.
What brands offer tires for the 1973 Mercury Montego?
BFGoodrich and Coker Classic both offer applicable tires for the 1973 Mercury Montego in sizes covered by this fitment range. Depending on size, those offerings appear in the Silvertown Classic Bias Ply and Coker Classic Bias Ply series, with sidewall choices that vary by product and application.
Brand alone should not decide the purchase. The more useful comparison is whether the tire is available in the exact Montego size needed and whether its sidewall treatment, construction, and rim-width specification match the car. Once those fundamentals are in place, the brand and series help narrow the choice toward the look and character the owner wants.
Restoration & Appearance
Which tire should I choose for a period-style 1973 Mercury Montego?
A period-style 1973 Mercury Montego tire choice begins with the correct primary size for the exact sub-model, then stays within the bias-ply or radial pattern appropriate to that application. Sizes such as F78-14, G78-14, H70-14, H78-14, and J78-15 support a traditional bias-ply look, while certain Montegos also use primary radial sizing.
Appearance details matter after the fitment is settled. Wide whitewall, narrow whitewall, and dual-white-stripe treatments can each shift the Montego’s character toward formal, restrained, or sporty period flavor. When exact originality is important, the final sidewall decision should be checked against marque-specific historical references or restoration documentation for the particular body style and trim level.
How does tire construction affect the appearance of a restored 1973 Mercury Montego?
Tire construction changes more than road feel on a restored 1973 Mercury Montego; it also changes the car’s visual character. A bias-ply tire usually supports a more traditional seventies presentation, especially when paired with a whitewall or dual-stripe sidewall, while a radial alternative can alter the overall stance and look.
That is why many restoration-minded buyers settle the appearance goal before comparing individual products. A Montego built to echo its original era often stays with a period-style bias-ply size, while a driver-oriented car may explore a radial equivalent where one exists. Either way, the selected tire still needs to match the car’s wheel diameter and the fitment for its exact sub-model.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1973 Mercury Montego?
Yes. Modifications can change tire fitment on a 1973 Mercury Montego even when the chosen size is correct for a stock application. Aftermarket wheels, different wheel widths, altered offsets, suspension changes, lowering, or body modifications can all affect how a 14-inch or 15-inch tire sits in the wheel opening.
A Montego with changes from stock should be checked at full steering lock and through normal suspension travel before settling on a tire. That is especially important when moving between bias-ply and radial constructions or when considering an equivalent size. Clearance at the fender edge, inner wheelhouse, and suspension components matters just as much as matching the printed size code.
What should I inspect before driving a 1973 Mercury Montego on new tires?
Before driving a 1973 Mercury Montego on new tires, inspect the wheels for correct diameter and condition, confirm that lug hardware seats properly, and check that the tire size matches the sub-model and wheel setup. It is also smart to verify inflation, valve stems, and visible clearance around the fenders and suspension.
A collector-era car deserves a broader once-over before regular road use. Look for worn steering or suspension parts, brake issues, uneven ride height, and anything that could affect tracking or tire clearance. After the first few drives, recheck pressure and inspect for rubbing marks, unusual wear, or air loss so any fitment issue is caught early.
How should 1973 Mercury Montego tires be maintained?
Tires on a 1973 Mercury Montego should be maintained with regular pressure checks, visual inspections, and periodic review of tread and sidewall condition. Collector cars that see limited use need special attention because age-related cracking, flat spotting, and slow air loss can develop even when mileage remains low.
Storage conditions matter nearly as much as driving habits. Keeping the car away from prolonged sunlight, heat, moisture, and ozone sources helps protect the rubber, and moving the car occasionally can reduce set-in-place wear. Before any longer trip, inspect for cuts, bulges, or irregular wear and make sure the tires still suit the Montego’s current wheels and overall setup.
