The 1974 International Pickup 100 comes from a period when light trucks still balanced work duty with straightforward, durable engineering, and International gave them a distinctly heavy-duty character. Today, these pickups attract owners who value originality, utility, and the look of a proper vintage truck stance. Tire selection centers on three 15-inch bias-ply sizes: G78-15, H70-15, and H78-15. That leaves room to choose between traditional wide whitewall styling and more truck-oriented blackwall designs, while modern radial equivalents are also available for owners considering a different road-use approach. The key is matching the right size to the truck's actual wheel setup and the appearance you want to preserve.
Which Tire Size Is Right for The 1974 International Pickup 100
The 1974 International Pickup 100 uses three primary tire sizes, all in bias-ply construction on 15-inch rims. Because both covered sub-models share the same size choices, the first step is usually confirming which of the three sizes is already on the truck and whether the wheels remain stock in width and diameter before choosing a period-style bias-ply tire or evaluating a radial equivalent.
G78-15 is a vintage alphanumeric bias-ply size in which the letter-and-number combination identifies the tire's width class and profile family, while the final 15 indicates a 15-inch rim. On a 1974 International Pickup 100, it represents one of the truck's traditional bias-ply fitments and suits owners staying with a distinctly vintage construction. Available choices include Coker Classic Bias Ply wide whitewall versions and the STA Super Traxion blackwall truck-style design. It is a useful size to consider when the goal is preserving an older pickup look while still matching the truck's wheel diameter correctly.
H70-15 is also a vintage alphanumeric bias-ply size, with the final 15 again indicating fitment on a 15-inch wheel and the H70 designation identifying its older size class and profile family. For the 1974 International Pickup 100, this is one of the primary bias-ply options and often matters most to owners trying to duplicate a traditional 1970s truck presentation. Radial equivalents exist for buyers considering a construction change while staying in a comparable sizing range. This size deserves a careful wheel and clearance check before moving away from the original-style bias-ply format.
H78-15 uses the same vintage alphanumeric bias-ply system, where H78 identifies the size family and 15 refers to the wheel diameter in inches. On the 1974 International Pickup 100, it is another primary 15-inch bias-ply fitment and has the broadest product variety here, including Coker Classic Bias Ply wide whitewalls and the STA Traxion blackwall truck tire. That gives owners a choice between restoration-oriented styling and a more utilitarian appearance. It is a strong candidate when the truck needs the proper vintage size format but the final look still matters.
Fitment is fairly straightforward across the covered 1974 International Pickup 100 sub-models because both stud variations use the same three 15-inch bias-ply tire sizes. Checking the exact sub-model still matters so the wheel hardware and existing wheel setup can be confirmed before choosing among the available size and style options.
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1974 International Pickup 100 (Base)(1/2-20 studs) (GVWR 5000 & 6000)
This 1974 International Pickup 100 Base configuration uses the same three 15-inch bias-ply tire sizes found across the covered fitments. Tire selection usually comes down to verifying which size is already on the truck, then deciding between a traditional whitewall presentation, a blackwall truck look, or a radial-equivalent path.
1974 International Pickup 100 (Base)(5/8-18 studs) (GVWR 5000 & 6000)
This 1974 International Pickup 100 Base configuration also shares the same 15-inch bias-ply tire size choices. That keeps fitment simple, but it still helps to confirm the wheel hardware and actual wheels on the truck before choosing a period-style replacement tire or considering a radial alternative.
Bias-Ply to Radial Tire Conversion for the 1974 International Pickup 100
The original 1974 International Pickup 100 bias-ply sizes each have four radial-equivalent paths. G78-15 corresponds to 205R15 as an 80-series metric radial, P215/75R15 as a 75-series P-metric radial, P225/70R15 as a 70-series P-metric radial, and 710R15 as a bias-look radial. H70-15 and H78-15 both correspond to 215R15, P225/75R15, P235/70R15, and 760R15. These options span traditional Euro-metric sizing, later P-metric profiles, and bias-look radial presentation, with a 6-8 inch recommended rim-width range that should still be checked against wheel dimensions and clearance.
Modern Radial Equivalents
205R15
Equivalent 80-series Metric Radial (G78-15)
P215/75R15
Equivalent P-metric 75-series Radial (G78-15)
P225/70R15
Equivalent P-metric 70-series Radial (G78-15)
710R15
Bias-look Radial Equivalent (G78-15)
215R15
Equivalent 80-series Metric Radial (H70-15)
P225/75R15
Equivalent P-metric 75-series Radial (H70-15)
P235/70R15
Equivalent P-metric 70-series Radial (H70-15)
760R15
Bias-look Radial Equivalent (H70-15)
215R15
Equivalent 80-series Metric Radial (H78-15)
P225/75R15
Equivalent P-metric 75-series Radial (H78-15)
P235/70R15
Equivalent P-metric 70-series Radial (H78-15)
760R15
Bias-look Radial Equivalent (H78-15)
Important Considerations When Replacing Bias Ply With Radial
Compare overall diameter and section width carefully to ensure proper fit.
Verify recommended rim range (6-8 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 1974 International Pickup 100 Tires for Sale
Available 1974 International Pickup 100 tire choices center on bias-ply 15-inch fitments from Coker Classic and STA, with Coker Classic Bias Ply wide whitewalls and STA truck-style blackwalls creating the biggest appearance difference across the product selection.
These 1974 International Pickup 100 tire FAQs focus on the three primary bias-ply sizes, 15-inch rim fitment, radial-equivalent choices, sidewall style differences, and the wheel and condition checks that matter before putting a vintage pickup back on the road.
Tire Size & Fitment
What tire size fits a 1974 International Pickup 100?
The 1974 International Pickup 100 uses three primary bias-ply tire sizes: G78-15, H70-15, and H78-15. All three are vintage alphanumeric sizes designed for 15-inch rims, and both covered Base sub-models share those same size options.
That means the main fitment question is usually not the sub-model, but which of those three sizes matches the truck's current wheel and tire setup. Many older pickups have been changed over the years, so it helps to confirm the wheel diameter, compare the size already on the truck, and inspect for any aftermarket wheel or suspension changes before choosing a replacement.
What size rim does a 1974 International Pickup 100 use?
The covered tire fitments for a 1974 International Pickup 100 all use a 15-inch rim diameter. That is true for G78-15, H70-15, and H78-15, so the wheel diameter remains consistent even though more than one tire size is used.
Rim diameter is only part of the fitment picture on a vintage truck. Wheel width still matters, especially if the pickup has replacement wheels, and radial-equivalent sizing should also be checked against the actual rim before conversion. A quick measurement of the existing wheel setup can prevent choosing a tire that is right in diameter but wrong for the wheel or truck stance.
Do all 1974 International Pickup 100 sub-models use the same tire size?
The covered 1974 International Pickup 100 sub-models share the same tire size choices. Both the Base model with 1/2-20 studs and the Base model with 5/8-18 studs use G78-15, H70-15, and H78-15 bias-ply tires on 15-inch rims.
That keeps the search simpler because the stud variation does not force a different tire size decision. Even so, the right replacement still depends on the truck's actual wheels and the size you intend to keep. Looking at the tires currently mounted, checking wheel width, and confirming that the truck has not been altered remain worthwhile steps before settling on one of the three primary sizes.
Bias-Ply & Radial Options
Is G78-15 a bias-ply or radial tire for the 1974 International Pickup 100?
G78-15 is a primary bias-ply tire size for the 1974 International Pickup 100. It uses a vintage alphanumeric format and belongs to the truck's original-style fitment family rather than a modern radial sizing system.
That matters because a bias-ply tire preserves the traditional vintage truck construction and appearance, while a radial equivalent changes both the sizing format and tire type. If the truck currently runs G78-15 and the goal is to keep a period-style presentation, staying with a bias-ply option is the straightforward path. Any move to a radial should include a wheel-width and clearance review before the change is made.
What radial tire sizes are equivalent to G78-15, H70-15, and H78-15 on a 1974 International Pickup 100?
G78-15 has four radial-equivalent options: 205R15, P215/75R15, P225/70R15, and 710R15. H70-15 and H78-15 share the same radial equivalents: 215R15, P225/75R15, P235/70R15, and 760R15, with the last size in each group serving as a bias-look radial alternative.
Those equivalents give a range of sizing conventions, from Euro-metric radial to P-metric profiles and a more traditional-looking radial. They should be treated as alternatives rather than automatic replacements. A 6-8 inch recommended rim-width range is associated with these equivalent paths, and the truck's actual wheel dimensions, tire clearance, and intended use should be checked before making the switch.
What should I check before converting my 1974 International Pickup 100 from bias-ply to radial tires?
Start by matching the truck's current primary size to the correct radial-equivalent group, then confirm the wheel diameter and actual wheel width. G78-15, H70-15, and H78-15 each have radial alternatives, but the equivalent should still suit the wheel and the truck's available space.
A conversion is easier to evaluate when the pickup is inspected as a complete setup rather than just by tire code. Check fender and steering clearance, verify that suspension height has not changed, and make sure the wheels are appropriate for the selected equivalent. Owners trying to keep a more traditional appearance may also want to compare a bias-look radial against standard metric radial options before deciding.
Choosing the Right Tire
What should I consider when choosing a G78-15, H70-15, or H78-15 tire for a 1974 International Pickup 100?
The first priority is choosing the same primary size family that matches the truck's current fitment and 15-inch wheels. From there, selection usually comes down to whether the pickup is being kept in a traditional bias-ply format, what kind of visual style suits the truck, and whether the tire will be used more for restoration display or regular road use.
Product differences matter once the size is settled. Some options lean toward a classic whitewall presentation, while others have a more work-truck blackwall character. It also helps to compare rim-width suitability where available, along with load figures when they are given, so the tire choice matches the truck's wheel setup and the way the vehicle will actually be driven.
What sidewall styles are available for 1974 International Pickup 100 tires?
The available sidewall styles for the 1974 International Pickup 100 include wide whitewall and blackwall designs. Coker Classic options in G78-15 and H78-15 focus on wide whitewall presentation, while STA truck-oriented choices bring a blackwall look.
That sidewall difference has a big effect on the truck's overall appearance even when the wheel diameter and vintage size format stay the same. A wide whitewall can emphasize a more dressed, restoration-oriented look, while a blackwall usually feels more utilitarian and work-truck appropriate. Choosing between them depends less on fitment and more on how you want the pickup to sit visually once the correct size is confirmed.
What brands offer tires for the 1974 International Pickup 100?
The available brands for 1974 International Pickup 100 tire fitments here are Coker Classic and STA. Coker Classic appears in whitewall bias-ply offerings, while STA covers blackwall truck-style bias-ply choices in the applicable 15-inch sizes.
Brand choice should be considered alongside size, construction, sidewall style, and tire series rather than in isolation. A buyer comparing these options is really deciding between different visual character and use emphasis within the same general vintage fitment category. Once the proper size is established, it becomes easier to narrow the field by appearance, wheel compatibility, and how traditional or utility-focused the finished truck should look.
Restoration & Appearance
Which tire should I choose for a period-style 1974 International Pickup 100?
A period-style 1974 International Pickup 100 usually starts with one of its primary bias-ply sizes: G78-15, H70-15, or H78-15. Staying in the original-style alphanumeric bias-ply format keeps the truck visually closer to its era than jumping immediately to a modern metric radial size.
The final choice depends on the truck's personality and how it is being presented. Whitewall bias-ply options create a more dressed vintage look, while blackwall truck tires feel more utility-oriented. If exact originality matters beyond general period style, it is worth comparing the tire decision with marque literature, older photos, or restoration references tied to the specific truck before settling on the sidewall treatment.
How does tire construction affect the appearance of a restored 1974 International Pickup 100?
Tire construction changes the visual impression of a restored 1974 International Pickup 100 more than many owners expect. A bias-ply tire keeps the truck in its proper vintage sizing language and construction type, while a modern radial equivalent introduces a later-style sizing format and a different overall presentation.
That does not mean a radial is inappropriate, especially if road use is part of the plan, but it does shift the truck away from a strictly old-truck look. Owners trying to balance appearance and drivability often compare standard metric radial equivalents with bias-look radial options. The closer the project is to a restoration-focused goal, the more construction choice becomes part of the visual strategy.
Fitment, Maintenance & Road Use
Can modifications affect tire fitment on a 1974 International Pickup 100?
Yes, modifications can affect tire fitment on a 1974 International Pickup 100 even when the nominal tire size looks correct. Aftermarket wheels, changes in wheel width, suspension alterations, ride-height changes, or brake upgrades can all influence how a G78-15, H70-15, H78-15, or radial-equivalent tire sits on the truck.
That is why older pickup fitment should always be checked on the actual vehicle. A truck that has been lowered, lifted, or fitted with replacement wheels may need closer attention to steering clearance and fender space than an unmodified example. Verifying the wheel dimensions and inspecting clearances at full turn can prevent costly mistakes before mounting a fresh set of tires.
What should I inspect before driving a 1974 International Pickup 100 on new tires?
Before driving a 1974 International Pickup 100 on new tires, inspect the wheels for correct diameter and condition, make sure the tires are properly seated and inflated, and look over the valve stems, lug hardware, and overall wheel attachment. A brief clearance check at rest and with the steering turned is also worthwhile.
A vintage truck deserves a broader once-over before road use, especially if it has sat for long periods. Check for suspension play, uneven ride height, brake issues, and any sign that the previous tires rubbed the body or chassis. A short, careful initial drive can then confirm that the truck tracks properly and that nothing contacts under turning or light suspension movement.
How should G78-15, H70-15, and H78-15 tires on a collector 1974 International Pickup 100 be maintained?
Collector-use tires on a 1974 International Pickup 100 should be maintained with regular pressure checks, visual inspections for cracking, cuts, bulges, and air loss, and periodic tread and sidewall review even if the truck is driven only occasionally. Low-mileage vintage vehicles can age tires without wearing them out.
Storage conditions matter almost as much as mileage on an older pickup. Keeping the truck away from prolonged sunlight, excess heat, standing moisture, and ozone sources helps preserve the tires between drives. It also pays to inspect them before every longer outing, since a vehicle that spends most of its time parked can develop issues that are easy to miss until the truck is back on the road.
