The 1985 Mitsubishi Trucks Mighty Max sits squarely in the compact pickup era, when small trucks were expected to handle daily work, light hauling, and personal use with straightforward mechanical character. That matters when choosing tires, because this Mighty Max can wear three distinct primary fitments depending on sub-model: 800-14 bias-ply, 185R14 radial, or GR78-15 radial. The tire decision is not just about size, but also about construction, wheel diameter, and the visual style you want the truck to carry. Available choices range from traditional bias-ply whitewalls to blackwall and narrow whitewall radials, with radial equivalents also available for the bias-ply application.
Which Tire Size Is Right for The 1985 Mitsubishi Trucks Mighty Max
Three primary tire sizes apply to the 1985 Mitsubishi Trucks Mighty Max, and the correct choice depends on the exact sub-model and wheel diameter. Two sizes use 14-inch rims, while GR78-15 uses a 15-inch rim, so the first step is confirming both the truck's sub-model and the wheels currently on it before comparing tire construction, sidewall style, or radial alternatives.
800-14 is a numeric bias-ply size in which the leading number represents a nominal section width of about 8.00 inches, while the final number identifies a 14-inch rim. On the Mighty Max, this is a traditional bias-ply fitment that suits buyers who want an older tire construction and a more vintage visual character. Available choices include BFGoodrich, Universal Vintage Tire, and Goodyear in blackwall, narrow whitewall, and wide whitewall styles across series such as Silvertown Classic Bias Ply, Universal Classic Bias Ply, and Custom Super Cushion. It is the size to evaluate when period-style appearance matters as much as basic fitment.
185R14 is a Euro-metric radial size with a 185 millimeter nominal section width, radial construction, and a 14-inch rim diameter. In this format, no aspect ratio is stated, and it is commonly treated as an 80-series style radial. For the Mighty Max, this size gives buyers a radial fitment with product differences that include blackwall and narrow whitewall sidewalls from Michelin, Phoenix, and Vredestein, along with series such as Michelin MXV and Sprint Classic. It is the right size to consider when the truck uses the 14-inch radial setup and you want to compare appearance, rim-width compatibility, and brand character.
GR78-15 is an alphanumeric radial size in which the letter and series designation identify the tire's vintage sizing class and profile family, while the final number marks a 15-inch rim. On the Mighty Max, this size belongs to the 15-inch radial application rather than the 14-inch fitments used elsewhere in the range. Because the wheel diameter changes here, this size should be approached as a specific sub-model fitment instead of a general alternative. The practical decision is confirming that the truck is one of the 15-inch applications and then matching the tire to the wheel setup and intended look.
Sub-model fitment matters on the 1985 Mitsubishi Trucks Mighty Max because tire size changes across the range. Some versions use 14-inch tires, while the 4x4 models move to a 15-inch radial fitment, so identifying the exact sub-model is the key first step before choosing a tire.
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1985 Mitsubishi Trucks Mighty Max Base
The 1985 Mitsubishi Trucks Mighty Max Base uses the 800-14 bias-ply size on a 14-inch rim. That makes tire selection less about sorting through multiple primary sizes and more about choosing the right sidewall style, brand, and whether to stay with the original-style construction or examine a radial equivalent.
The 1985 Mitsubishi Trucks Mighty Max SP 4x2 uses the 185R14 radial size on a 14-inch rim. Tire selection centers on choosing among available radial products, sidewall treatments, and rim-width compatibility rather than deciding between multiple primary fitments.
The 1985 Mitsubishi Trucks Mighty Max SP 4x4 uses the GR78-15 radial size on a 15-inch rim. That makes wheel confirmation especially important, since this fitment differs from the 14-inch applications elsewhere in the Mighty Max lineup.
The 1985 Mitsubishi Trucks Mighty Max SPX 4x2 uses the same 185R14 radial fitment found on the other 4x2 radial application. The main decision here is comparing the available blackwall and narrow whitewall radial choices and making sure the wheel width suits the tire you are considering.
The 1985 Mitsubishi Trucks Mighty Max SPX 4x4 uses the GR78-15 radial size on a 15-inch rim. Buyers should confirm the truck still carries the correct wheel diameter, especially if wheels or suspension have been changed over the years.
Bias-Ply to Radial Tire Conversion for the 1985 Mitsubishi Trucks Mighty Max
For the 800-14 primary tire size, four radial-equivalent options are available. 205R14 is the 80-series metric radial equivalent, P215/75R14 is the P-metric 75-series radial equivalent, and P225/70R14 is the P-metric 70-series radial equivalent. 800R14 is the bias-look radial equivalent. These choices give the 800-14 application a range of sizing formats and visual directions, from conventional metric radial sizing to a more traditional bias-look presentation. A recommended rim-width range of 5 to 7 inches applies, and any conversion should still be checked against the truck's wheel setup and clearance.
Modern Radial Equivalents
205R14
Equivalent 80-series Metric Radial (800-14)
P215/75R14
Equivalent P-metric 75-series Radial (800-14)
P225/70R14
Equivalent P-metric 70-series Radial (800-14)
800R14
Bias-look Radial Equivalent (800-14)
Important Considerations When Replacing Bias Ply With Radial
Compare overall diameter and section width carefully to ensure proper fit.
Verify recommended rim range (5-7 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 1985 Mitsubishi Trucks Mighty Max Tires for Sale
Available Mighty Max tire choices span BFGoodrich, Universal Vintage Tire, Goodyear, Michelin, Phoenix, and Vredestein, with both bias-ply and radial constructions represented. Depending on size, buyers can compare blackwall, narrow whitewall, and wide whitewall styles across several vintage and classic tire series.
These FAQs focus on the exact tire sizes used on the 1985 Mitsubishi Trucks Mighty Max, how they vary by sub-model, and what to review when comparing bias-ply, radial, sidewall, and wheel-fitment choices.
Tire Size & Fitment
What tire size fits a 1985 Mitsubishi Trucks Mighty Max?
The 1985 Mitsubishi Trucks Mighty Max uses three different primary tire sizes depending on sub-model: 800-14, 185R14, and GR78-15. The Base model uses 800-14 bias-ply, the SP 4x2 and SPX 4x2 use 185R14 radial, and the SP 4x4 and SPX 4x4 use GR78-15 radial.
That means tire selection starts with the exact truck configuration, not just the year and model name. The 14-inch and 15-inch applications are not the same, and construction also changes across the range. Before choosing a tire, verify the sub-model and confirm the wheel diameter actually on the truck, especially if it has been modified or restored.
What size rim does a 1985 Mitsubishi Trucks Mighty Max use?
A 1985 Mitsubishi Trucks Mighty Max can use either a 14-inch or 15-inch rim, depending on sub-model. The 800-14 and 185R14 fitments are used on 14-inch rims, while the GR78-15 fitment uses a 15-inch rim.
Rim diameter is the first thing to confirm because it immediately narrows the correct tire choices. A 14-inch tire cannot be mounted on a 15-inch wheel, and vice versa. Once diameter is confirmed, check wheel width and the truck's exact sub-model so the tire choice matches both the wheel and the intended fitment.
Do all 1985 Mitsubishi Trucks Mighty Max sub-models use the same tire size?
No, the 1985 Mitsubishi Trucks Mighty Max does not use one tire size across every sub-model. The Base uses 800-14, the SP 4x2 and SPX 4x2 use 185R14, and the SP 4x4 and SPX 4x4 use GR78-15.
This is why a general Mighty Max tire search can be misleading. The correct tire depends on whether the truck is a Base, 4x2, or 4x4 application, and the wheel diameter changes with the GR78-15 fitment. Confirming the sub-model helps avoid choosing a size that matches the year but not the actual truck.
Bias-Ply & Radial Options
Is 800-14 a bias-ply or radial tire for the 1985 Mitsubishi Trucks Mighty Max?
On the 1985 Mitsubishi Trucks Mighty Max Base, 800-14 is a bias-ply tire size. It is the traditional primary fitment for that sub-model, while other Mighty Max versions use radial sizes such as 185R14 and GR78-15.
That distinction matters because choosing 800-14 usually means deciding whether to keep a vintage-style bias-ply presentation or move to one of the radial equivalents available for that application. Construction affects both appearance and setup, so the wheel width, overall tire dimensions, and clearance should be reviewed before making a change.
What radial tire sizes are equivalent to 800-14?
Radial equivalents for 800-14 include 205R14 as the 80-series metric radial option, P215/75R14 as the P-metric 75-series radial option, P225/70R14 as the P-metric 70-series radial option, and 800R14 as the bias-look radial equivalent. These alternatives apply to the 800-14 fitment used on the Mighty Max Base.
Each option represents a slightly different sizing convention and visual direction, so the choice is not purely cosmetic. The recommended rim-width range is 5 to 7 inches, and any conversion should be checked against the actual wheel, the truck's stance, and available clearance. An equivalent size is a useful alternative, but it still needs a fitment check.
What should I check before converting my 1985 Mitsubishi Trucks Mighty Max from bias-ply to radial tires?
Start by confirming that the truck is the 800-14 application, since that is the Mighty Max fitment with radial equivalents called out. Then verify the wheel diameter, confirm that the wheel width falls within the recommended range for the equivalent under consideration, and compare the intended radial size against the truck's available clearance.
Condition matters too, especially on an older compact truck that may have replacement wheels or suspension changes. Check front steering clearance, rear fender space, and the general condition of springs, bushings, and shocks before switching constructions. That approach helps keep the conversion focused on proper fitment rather than assuming every radial equivalent behaves the same.
Choosing the Right Tire
What should I consider when choosing a 1985 Mitsubishi Trucks Mighty Max tire?
The first consideration is the correct primary size for the exact sub-model: 800-14, 185R14, or GR78-15. After that, the decision moves to construction, wheel diameter, and whether the truck is being kept in a more traditional style or driven with a more modern radial setup where that applies.
Product differences can also shape the final choice. Depending on size, buyers can compare sidewall style, tire series, rim-width specification, weight, and load figures where they are given. A truck used for restoration-minded presentation may point toward one type of look, while a regular-use truck may lead you toward a different construction or sidewall treatment.
What sidewall styles are available for 1985 Mitsubishi Trucks Mighty Max tires?
Sidewall styles available for 1985 Mitsubishi Trucks Mighty Max tires include blackwall, narrow whitewall, and wide whitewall. The 800-14 bias-ply fitment offers the broadest whitewall variety, while the 185R14 radial fitment is available in blackwall and narrow whitewall versions.
Sidewall style mainly affects the truck's visual presentation, so it is worth matching that choice to the look you want. A whitewall can push the truck toward a more period-style or custom appearance, while a blackwall keeps the presentation simpler. The key is to choose the correct size first, then narrow the options by appearance.
What brands offer tires for the 1985 Mitsubishi Trucks Mighty Max?
Tires for the 1985 Mitsubishi Trucks Mighty Max are available from BFGoodrich, Universal Vintage Tire, Goodyear, Michelin, Phoenix, and Vredestein. Brand availability varies by size, with the 800-14 bias-ply selection and the 185R14 radial selection drawing from different groups of manufacturers.
Brand choice should be considered alongside the exact tire size, construction, sidewall style, and wheel requirements rather than treated as a standalone decision. Some buyers will focus on a traditional bias-ply look, while others will be comparing classic-style radials. Once the correct size is established, brand becomes part of the broader product comparison.
Restoration & Appearance
Which tire should I choose for a period-style 1985 Mitsubishi Trucks Mighty Max?
A period-style 1985 Mitsubishi Trucks Mighty Max tire choice starts with the correct sub-model fitment. The Base model's 800-14 bias-ply size naturally supports a more traditional presentation, while the 185R14 and GR78-15 applications keep the truck within its era-appropriate radial sizing framework.
After size is confirmed, appearance comes down to sidewall style and the overall character you want the truck to show. Blackwall, narrow whitewall, and wide whitewall options can create very different impressions. For exact restoration goals, it is smart to compare the tire choice against marque references, photos, or other vehicle-specific historical material.
How does tire construction affect the appearance of a restored 1985 Mitsubishi Trucks Mighty Max?
Tire construction can noticeably change the visual feel of a restored 1985 Mitsubishi Trucks Mighty Max. A bias-ply 800-14 on the Base model gives the truck a more traditional vintage presentation, while the 185R14 and GR78-15 radial fitments carry a more contemporary-in-period look for mid-1980s use.
That makes construction part of the restoration decision, not just a technical detail. Even when a radial equivalent exists for the bias-ply application, the truck may present differently once the tire profile and sidewall style change. Buyers aiming for a specific finished look should weigh construction and sidewall treatment together rather than separately.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1985 Mitsubishi Trucks Mighty Max?
Yes, modifications can affect tire fitment on a 1985 Mitsubishi Trucks Mighty Max. Changes such as aftermarket wheels, altered wheel width, suspension lowering or lifting, and body or fender work can all influence whether the intended tire size has proper clearance and sits correctly on the wheel.
That is especially important here because the Mighty Max range includes both 14-inch and 15-inch fitments. A truck may no longer carry the wheel diameter associated with its original sub-model. Before mounting tires, check the actual wheel size, inspect inner and outer clearance, and turn the steering through full travel on front applications.
What should I inspect before driving a 1985 Mitsubishi Trucks Mighty Max on new tires?
Before driving a 1985 Mitsubishi Trucks Mighty Max on new tires, inspect the wheels for the correct diameter and general condition, confirm inflation pressure, and look over the suspension and steering for obvious wear that could affect tracking or clearance. It also helps to make sure lug hardware and valve stems are in good condition.
A short test drive should be done with attention to rubbing, vibration, and steering response. Recheck pressure after the tires have settled, and look for any signs of contact inside the wheelwell or near suspension parts. On an older truck, those simple checks can catch setup issues before the first longer trip.
How should tires on a collector 1985 Mitsubishi Trucks Mighty Max be maintained?
Tires on a collector 1985 Mitsubishi Trucks Mighty Max should be maintained with regular pressure checks, periodic visual inspections, and attention to age-related condition as well as tread wear. Even low-mileage trucks can develop cracking, flat-spotting, bulges, or slow air loss if they sit for long periods.
Storage conditions matter just as much as mileage. Keeping the truck away from prolonged sunlight, excess heat, moisture, and ozone sources helps protect the rubber over time. A collector truck should also have its tires inspected before road use after long storage, since time and environment can affect condition even when the tread still looks good.
