The first cold morning is a bad time to discover that a kei truck’s tires are the weak link. A winter tire can help, but the useful decision starts with the exact size and load marking your truck needs, not with an aggressive sidewall or a marketplace title.
This guide uses Fuji Corporation’s listing for the Gripmax ICE X SUV in 145/80R12 80/78N as a starting point for size and fitment checks. It is source-based research, not a road test.
What We Could Verify
Fuji Corporation’s published size table lists 145/80R12 80/78N under Gripmax ICE X SUV. The series name matters: do not assume that a similarly named ICE X product has the same specification. This Japanese retailer listing gives readers a particular size and series to investigate; it does not approve that tire for every imported kei truck.
We could not verify a current U.S. seller, local availability, DOT status, or a universal model-year application from the manufacturer sources available at the time of this update. Treat each seller listing as a starting point: confirm the exact size, load marking, date code, and installation support before ordering.
Why Winter Tires Are a Different Choice
NHTSA explains that winter tires are more effective than all-season tires in deep snow. That does not make a tire a substitute for a slower speed, a clear route, or sound judgment on ice. A lightweight kei truck can be useful on a property in winter, but it still has limited mass, a short wheelbase, and a small contact patch.
Choose a true winter tire when the truck regularly sees sustained cold, packed snow, or slush. If the truck mostly runs on dry pavement with only an occasional cold morning, an all-season tire in the correct size may be the more practical choice. Our all-terrain tire guide explains the separate decision for mixed gravel and property use.
Fitment Comes Before Brand
Start with three records: the vehicle placard, the sidewall of the current tires, and the exact specification of the proposed tire. Compare more than the rim diameter:
- Complete tire size and overall diameter
- Maximum load marking and inflation information
- Wheel width, offset, bolt pattern, and clearance
- Front steering clearance at full lock
- Fender, mud-flap, suspension, brake-line, and cargo-load clearance
A number such as “12-inch” only describes the wheel diameter. It does not confirm a tire’s width, height, load capability, or clearance. NHTSA notes that the tire sidewall’s maximum load rating is the best guide for carrying capability; that matters every time the bed is loaded with tools, supplies, or firewood.
Check the Series and the Exact Size Together
The ICE X SUV table includes the 12-inch size discussed here as well as other sizes. The SUV name does not mean every tire in the range is a large-diameter option, and the same range name does not make its different sizes interchangeable. Keep the complete size and load/speed marking with the series name when contacting a seller.
Compare that exact tire with the vehicle’s required tire information, wheel specification and intended use. Larger dimensions are not automatically an improvement. For a wheel change, use our 12-inch wheel guide alongside the vehicle information rather than choosing from a photograph alone.
Cold-Weather Routine That Pays Off
Winter readiness is mostly ordinary maintenance done consistently. NHTSA recommends checking tire pressure when the tires are cold, after the vehicle has been parked for at least three hours, and checking all tires at least monthly. During the first week after installation, recheck pressure, look for rubbing at full lock, and confirm that wheel hardware remains secure according to the vehicle and wheel-maker instructions.
A pressure gauge and tread-depth gauge are small purchases, but they make this process repeatable. See our practical inspection kit for what these tools can and cannot tell you. Any Amazon purchase links on that page are disclosed immediately beside the relevant link.
Before You Order
- Ask the seller for the full size, load/speed marking, and manufacturing-date information.
- Confirm that the tire matches the vehicle’s required capacity and intended use.
- Verify whether your wheel and tire package needs different hardware or clearance work.
- Check your state and local winter-equipment rules rather than relying on a general “legal everywhere” claim.
- Have a qualified tire professional confirm the combination if any measurement or marking is unclear.
Final Takeaway
The Gripmax ICE X SUV listing gives some kei truck owners a concrete 12-inch winter-tire size to investigate: 145/80R12 80/78N. It is not a blanket recommendation. Use the placard and sidewall as the authority for your own truck, confirm the seller’s current specification, and choose the tire that keeps the truck predictable in the weather you actually drive through.
Sources and Verification
- Fuji Corporation – Gripmax ICE X SUV size table
- Gripmax – official product range
- NHTSA TireWise – tire selection and pressure guidance
- NHTSA – winter driving preparation
- Editorial archive: Magazine Daichi / Kei Truck Kingdom (licensed source material).
Original sources checked: August 13, 2026. Fuji Corporation series and size table rechecked: September 20, 2026.
Disclaimer
Tire availability, size markings, load ratings, vehicle clearances, and winter-equipment rules vary by vehicle, seller, and location. This article is general information, not a fitment approval or a claim of tire availability in the United States. Confirm the exact tire-and-wheel combination with the vehicle information, current seller specifications, and a qualified tire professional before purchase or installation.
Source-based editorial update with AI assistance: September 20, 2026. No hands-on tire test was performed.