YUNSCM 24″ E Bike Tires Review
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Replacing a 24-inch fat-bike tire is less about finding any tire marked “24 inch” and more about matching the exact rim diameter, width, load, and riding style. The YUNSCM Y-1139 is a single 24 x 4.0 folding tire sized 98-507, with a directional all-terrain tread, a 5 to 30 PSI inflation range, and a stated 90 kg (198 lb) maximum load. It is a practical option for mixed pavement and packed-trail use, but it does not include an inner tube and should not be treated as a dedicated racing, extreme off-road, or ice tire. This review explains the fit, installation needs, real-world tradeoffs, and who should consider it.
Quick Verdict
Rating: 7.5/10, recommended with caveats
Best For: Riders who need one affordable 24 x 4.0 replacement tire for a compatible 98-507 fat e-bike or fat bike.
Bottom Line: The YUNSCM Y-1139 offers useful mixed-surface traction, a broad pressure range, and a foldable design that is easier to store. Its main tradeoffs are narrow size compatibility, a tire-only package, and no stated tubeless-ready or dedicated puncture-protection feature.
| Specification | Detail |
|---|---|
| Brand | YUNSCM |
| Product line | Y-1139 |
| Product type | Folding fat-bike and e-bike replacement tire |
| Labeled size | 24 x 4.0 |
| ETRTO size | 98-507 |
| Inflation range | 5 to 30 PSI (40 to 210 kPa, 0.4 to 2.1 bar) |
| Maximum load | 90 kg (198 lb), as stated by the seller |
| Tread | Directional all-terrain block pattern |
| Material | Rubber with a seller-described high-content butyl rubber formula |
| Wheel position | Front or rear, when size and clearance match |
| Package | One tire only, no inner tube or rim strip |
| Color | Black |
| Manufacturer listed by Amazon | JinDe |
| Warranty note | Limited coverage; the listing excludes damage from extreme off-road use, overloading, racing, modifications, and improper installation |
Key Takeaways
- The YUNSCM Y-1139 is a single 24 x 4.0 tire that requires a 98-507 rim and enough frame and fork clearance.
- Its directional block tread is designed for regular all-terrain riding, including pavement, packed gravel, and moderate trails.
- The 5 to 30 PSI range lets you balance cushioning and rolling firmness, but the correct pressure also depends on your rim, tube, load, and bike instructions.
- The package contains one tire only, so you may need a correctly sized inner tube, rim tape, and installation tools.
- The foldable design is convenient for storage, but the bead must be inspected and allowed to regain an even shape before installation.
[Products Worth Considering]
This Hycline 2-pack mountain bike tire set delivers durable, puncture-resistant performance with a high-grip, aggressive tread designed for traction on hard surfaces and confident handling through mud and soil. Includes matching inner tubes and tire levers for easier everyday maintenance and quicker installation after folding storage. Built for a range of riding conditions with reinforced rubber and nylon cord for wear-resistant reliability.
This heavy-duty fat bike inner tube is built for secure fit on 20-inch wheels with 3.5 to 4.0 inch wide tires, including e-bikes and mountain bikes. It uses thick butyl rubber for improved durability, air tightness, and a smoother, more comfortable ride. A standard Schrader valve makes inflation easy and helps keep pressure stable for safer rides, with tire levers included for simpler installation.
Upgrade your ride with a 2-pack set of 26x1.95 folding mountain bike tires built for dependable traction on mud, rocks, and trail surfaces. A reinforced puncture-resistant layer helps protect against sharp debris, while included butyl inner tubes provide strong sealing and shock absorption. Ready for fast swaps with included tire levers and universal sizing for most bikes.
What Is the YUNSCM Y-1139?
The YUNSCM Y-1139 is a wide replacement tire for bikes that use the 24 x 4.0, 98-507 size. The 507 number identifies the bead-seat diameter in millimeters, which is the most important fit figure. A standard 24-inch bicycle tire with a different ETRTO diameter will not automatically fit the same rim.
YUNSCM uses a directional block tread intended for regular all-terrain use. The design aims to give you steadier grip than a smooth street tire on gravel and firm trails while remaining usable on pavement. It is not presented as a high-speed racing tire, a dedicated mud tire, or a studded winter tire.
The tire arrives folded and may feel soft or uneven when first opened. That is normal for this design, but a sharply bent, exposed, or damaged bead wire is not normal and should be checked before installation.
Before You Buy: Match the full 98-507 marking, not only the words “24 inch.” Also confirm frame, fork, fender, and brake clearance for a 4-inch-wide tire. The package includes one tire and does not include an inner tube.
Who Should Buy It?
Best For
- Owners replacing one worn 24 x 4.0, 98-507 fat-bike tire.
- Riders who split time between pavement, packed gravel, and moderate trails.
- Buyers who want a foldable spare or replacement with a 5 to 30 PSI range.
Skip If
- Your rim does not show a compatible 507 mm bead-seat diameter.
- You need a tube, rim strip, or complete two-wheel replacement kit in the box.
- You specifically need tubeless-ready construction, studs, a racing casing, or a verified puncture-protection belt.
Fit and Compatibility
The printed 98-507 size is the starting point for compatibility. The first number is the approximate tire width in millimeters, and 507 is the rim bead-seat diameter. Your current tire sidewall should show 98-507 or a compatible size approved by the bike and rim manufacturer.
Width also matters. A 4-inch tire needs enough space between the frame stays, fork legs, fenders, chain, and brakes. Two bikes with 24-inch wheels can have very different clearance, so measuring your current setup is safer than relying on wheel diameter alone.
The seller lists the tire for front or rear use. You can install it in either position if the wheel, frame, load, and tread-direction requirements are met. When replacing only one tire, keep in mind that a different tread pattern or tire profile at the other wheel may change steering and cornering feel.
Materials, Tread, and Build Quality
The listing describes a rubber tire made with a high-content butyl rubber formula for lower odor and better wear resistance. The block-shaped tread has a directional layout, so the rotation arrow on the sidewall should face the correct way when the wheel rolls forward.
This tread pattern is a middle-ground design. It has more edges for loose surfaces than a smooth street tread, but the blocks are not as open or aggressive as those on a dedicated mud tire. That makes the YUNSCM more suitable for everyday mixed riding than for deep mud, high-speed competition, or repeated hard impacts.
The soft-wire folding design reduces storage bulk. However, the seller warns against sharply folding or over-bending the bead area. If the bead wire is badly kinked, exposed, or unable to recover its shape, do not force the tire onto the rim.
How It Performs in Real Use
For Daily Pavement Riding
The large 4-inch casing can add cushioning over cracks and rough pavement when pressure is set correctly. The directional blocks should track predictably at normal commuting speeds, although they will usually create more rolling resistance and tread feel than a smoother street-focused fat tire.
For Packed Gravel and Moderate Trails
The block tread gives you more biting edges on firm dirt and gravel than a slick design. It should suit park paths, fire roads, and moderate trails, but the listing limits the tire to regular all-terrain riding and excludes damage from extreme off-road use.
For Loose Ground and Light Snow
A wide tire can spread the bike’s weight over a larger contact area, which may help on loose surfaces when pressure is adjusted within safe limits. Still, this tire has no stated studs, winter rating, or ice-specific compound. Treat it as an all-terrain tire, not a substitute for a dedicated snow or ice setup.
For Storage or Emergency Replacement
The folding design takes less storage space than a rigidly shaped tire, making it easier to keep at home or carry as a spare. After unfolding, give the tire time to relax, inspect the bead, and shape it evenly before mounting. A folded spare is useful only if you also have the correct tube and tools.
| Surface | Expected Strength | Main Tradeoff |
|---|---|---|
| Pavement | Stable, cushioned fat-tire feel | More drag than a smooth road tread |
| Packed gravel | Useful block-tread grip | Pressure and loose depth affect control |
| Moderate trail | Balanced mixed-surface traction | Not intended for extreme off-road abuse |
| Snow or ice | Wide footprint may help on soft, packed snow | No studs or dedicated ice rating stated |
Installation Tips and Common Mistakes
Start with the wheel removed according to your bike manufacturer’s instructions. Inspect the rim, rim tape, and tire well for burrs, sharp edges, debris, or damage. A sharp rim edge can cut the tube or damage the new tire during installation.
Unfold the YUNSCM tire gently and identify the rotation arrow. Place one bead on the rim, fit the correctly sized tube with a small amount of air, and work the second bead into place without pinching the tube. Tire levers can help, but use them carefully near the tube and bead.
Before full inflation, check both sides to make sure the bead is evenly seated and the valve stands straight. Inflate gradually, staying within the tire, rim, tube, and bike limits. Spin the wheel and look for a section that rises, dips, or sits unevenly before riding.
Pro Tip: After mounting, inflate only enough to shape the tire, massage the sidewalls around the rim, and confirm the bead line is even on both sides. Then increase pressure gradually to your safe riding setting.
[Products Worth Considering]
Protect your inner tube with this universal bike tire liner designed to block thorns, glass, nails, and sharp trail debris. It installs easily by measuring and trimming to fit, creating a durable barrier between tire and tube. Lightweight polyurethane construction helps reduce sudden flats for more confident rides.
Ride with confidence using these fat tire inner tubes designed for 26-inch e-bikes and bikes. The butyl rubber construction delivers good airtightness, durability, and shock absorption for a smoother ride. Each tube fits 26x3.5 to 4.0 tires with an AV 32mm Schrader valve, and the kit includes tire levers for easier installation.
This 2-pack set includes two folding mountain bike tires, two inner tubes, and two tire levers for quick, budget-friendly replacements. The tires feature an anti-stab weave for added protection, plus strong grip and durable construction to help you stay stable across common trail and road conditions. Foldable design makes storage and travel convenient, while the included tubes provide a matched fit for smoother setup.
Pressure, Load, and Safety
The stated inflation range is 5 to 30 PSI. Lower pressure within that range can increase cushioning and the contact patch, while higher pressure can reduce squirm and rolling drag. The best setting depends on rider and cargo weight, terrain, tube, rim width, and the bike manufacturer’s guidance.
Never exceed the lowest maximum pressure printed on the tire, rim, or tube. Running too little pressure can allow rim strikes, tube pinches, bead movement, or unstable handling. Running too much pressure can reduce traction and place unnecessary stress on the tire and rim.
The seller states a 90 kg (198 lb) maximum load for the tire. Do not assume that figure is the total safe capacity of the complete bike. The frame, fork, wheels, spokes, rack, and other components may have lower limits, and load distribution differs between the front and rear wheels.
Inspect the tread, sidewalls, and bead before each ride after installation. Stop using the tire if you find exposed wire, deep cuts, bulges, cord damage, severe cracking, or a bead that will not seat evenly. A bicycle mechanic is the safer choice when you are unsure about compatibility or installation.
Durability and Maintenance
The seller positions the rubber formula as wear-resistant, but no mileage warranty or expected tread life is stated. Actual life will depend on pressure, rider and cargo load, road debris, braking, motor power, alignment, storage, and how often you ride on abrasive pavement.
Check pressure regularly with a gauge because wide tires can still lose enough air to affect handling before they look flat. Remove embedded glass or sharp debris before it works deeper into the casing. Keep the tire away from petroleum products, high heat, direct long-term sunlight, and ozone-producing equipment during storage.
Rear e-bike tires often wear faster because they carry more load and may transmit motor torque. Rotate tires only if your bike and tire setup allows it, and always keep tread direction correct after any position change.
Pros and Cons
Pros
- Exact 24 x 4.0, 98-507 sizing is clearly stated.
- Directional block tread supports pavement and moderate trail use.
- Wide 5 to 30 PSI range allows terrain and load adjustment.
- Foldable design is easier to store and transport.
- Can be used on the front or rear when fit and clearance are correct.
Cons
- One-tire package does not include a tube, rim strip, or tools.
- No tubeless-ready claim or dedicated puncture-protection belt is stated.
- Not intended for racing, overloading, extreme off-road use, or dedicated ice riding.
Is It Worth the Price?
The YUNSCM Y-1139 is best viewed as a value-focused single replacement tire rather than a premium performance upgrade. It offers strong value for the price when you need the exact 98-507 size, want mixed-surface tread, and already have the correct tube and installation supplies.
It is less compelling if you need a matched pair, a complete tire-and-tube kit, tubeless-ready construction, or documented high-end casing technology. Check the current listing configuration before ordering because the product page may also display other package quantities or related variants.
How It Compares to Alternatives
The ULTRAVERSE 24×4 is another directional all-terrain option worth comparing when you want a similar street-and-trail focus. The Vee Tire Co. Mission Command 24 x 4.0 is a more premium alternative with published 72 TPI and tubeless-ready specifications, plus a lower-profile tread aimed at faster rolling.
The YUNSCM makes the most sense when your priority is a straightforward, single 98-507 replacement at a value-oriented level. The Vee option is more suitable when confirmed tubeless compatibility, casing details, and faster rolling matter enough to justify a likely higher cost.
Frequently Asked Questions
Does the YUNSCM 24 x 4.0 tire include an inner tube?
No. The verified package contains one 24 x 4.0 tire only. Buy a compatible tube and rim strip separately if your wheel needs them.
Will it fit every 24-inch fat bike?
No. Confirm the 98-507 marking on your current tire or rim, then check clearance for a 4-inch width. A different 24-inch ETRTO diameter is not automatically compatible.
Can it be installed on the front or rear wheel?
Yes, the seller lists it for front or rear use. Match the size, follow the tread-direction arrow, and confirm that the wheel position has enough frame, fork, fender, and brake clearance.
Is the YUNSCM Y-1139 tubeless-ready?
The listing does not state that this model is tubeless-ready. Plan on a compatible inner-tube setup unless YUNSCM confirms tubeless use for your exact rim and tire combination.
What pressure should you use?
The stated range is 5 to 30 PSI. Choose a pressure within the limits of the tire, rim, tube, and bike, then adjust for load and terrain without allowing rim strikes, bead movement, or unstable handling.
Is it suitable for snow and ice?
The wide casing and block tread may help on soft or packed snow, but no studs or dedicated ice rating are stated. Use extra caution in winter and choose a purpose-built tire when reliable ice traction is required.
What tools are needed for installation?
Typical tools include the correct wheel-removal wrench or hex key, tire levers, a pressure gauge, and a pump. You may also need new rim tape and a correctly sized tube.
What does the limited warranty exclude?
The listing says damage from extreme off-road riding, overloading, racing, modifications, or improper installation is not covered. No specific warranty term is stated, so confirm current coverage with the seller before purchase.
The Bottom Line
The YUNSCM Y-1139 is a sensible choice when you need one 24 x 4.0, 98-507 replacement tire for everyday pavement, gravel, and moderate trail riding. Its main strengths are clear sizing, a versatile tread, and easy storage, while its limits are the tire-only package, unconfirmed tubeless compatibility, and ordinary all-terrain rather than specialized performance.
Buy it when the exact ETRTO size and value-focused design match your bike. Skip it when you need a complete kit, premium casing details, racing capability, or dedicated snow and ice traction.
Ready to Buy?
Check the latest price, package quantity, and product details before you decide.
[Products Worth Considering]
Replace worn inner tubes on compatible Razor and kids electric mini dirt bikes with a correct 12.5x2.75 straight valve stem tube. It helps prevent leakage and keeps tires working safely for daily rides and rough terrain use. The package includes two tubes, a valve core wrench, brass valve stem cores, and red valve caps.
The TANX hitch bike rack securely fits any 2-inch receiver and carries up to two bikes, including heavy-duty e-bikes and fat tires up to 5 inches wide. Its foldable, smart tilting design lets you access your trunk or tailgate without removing the bikes. An anti-wobble hitch tightener and locking hitch pin help keep the ride stable, while padded, adjustable cradles and straps protect bike finishes during transport.
HEB heavy duty inner tubes deliver reliable puncture resistance for fat tire electric bikes and mountain bikes running 20x4 or 26x4 tires. Built for rugged backcountry trails, they help prevent flats from rocks and thorns while providing stability and traction. Choose a single tube or multi-packs for better value and keep your ride running smoothly in all seasons.
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