Will it fit my 20-inch fat bike?

It fits most frames and e-bike kits built for 20x4.0 tires. Check your frame and rim clearance before buying, since some narrow frames run tighter.

Is it good for off-road riding?

It handles gravel, hardpack and light trails. The flat block tread is not made for deep mud or snow, where a knobbier tire grips better.

What pressure should I run?

The tire is rated to a maximum of 30 PSI. Lower pressure softens the ride and adds grip; higher pressure rolls faster on pavement.

Is it tubeless compatible?

The maker does not state a tubeless rating. Treat it as a tube-type tire unless your rim and setup are confirmed otherwise.

How much weight can one tire carry?

Each tire is rated for up to 198 lbs (98 kg) at 30 PSI. Stay within that per-tire limit when loading a cargo e-bike.

Is it worth it over a knobby fat tire?

For commuting and paved or mixed riding, yes: it rolls easier and rides quieter. For serious off-road use, a more aggressive tread is the better pick.

Where is the Auxfore cheapest?

At Hycline, for $44.99, as of our latest check.

What do buyers say about the Auxfore?

Rated 4.8 out of 5 from 12 ratings.

Auxfore

Best price now

$44.99at HyclineChecked 14 min ago

Prices are checked against each store and labelled with when.

Visit Hycline

Auxfore

Best price now

$44.99at HyclineChecked 14 min ago

Prices are checked against each store and labelled with when.

Visit Hycline

Ask our agent about this product

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Price facts

Lowest price today: $44.99 at Hycline (checked Nov 14, 2026).

Our take on the Auxfore

The Auxfore is a 20x4.0 inch fat bike tire with a flat block tread aimed at e-bikes and fat-tire bikes ridden mostly on pavement, gravel and light trails. Its block pattern is built to cut rolling drag on asphalt while keeping grip on mixed surfaces, and the reinforced compound is claimed to add puncture resistance. The folding bead and 30 TPI casing make it a reasonable spare or replacement for most 20x4.0 frames and kits. It is a street-leaning fat tire rather than a deep-mud or snow tire, so riders who want aggressive off-road bite should look at knobbier rivals.

Best forE-bike commuters on pavement and gravelFat-tire leisure and cruiser ridersReplacing worn 20x4.0 tires on most frames

Pros

Flat block tread keeps rolling resistance low on asphalt
Wide 4.0 inch contact patch adds stability
Reinforced compound aimed at puncture resistance
Folding bead is easier to carry as a spare
Rated to 198 lbs per tire at 30 PSI

Cons

Block tread gives limited bite in deep mud or snow
30 TPI casing is basic versus higher-thread-count tires
Single 30 PSI limit leaves little room for pressure tuning
No tubeless-specific claim from the maker

Auxfore prices at every store

HyclineNew
In stockReturn policy
$44.99Checked 14 min ago
Visit Hycline

What reviewers say

4.8 / 512 ratings

Buyers describe it as a solid, smooth-rolling replacement tire for 20-inch fat e-bikes.

What people mention

Rolling resistancePraisedRiders say the flat block tread rolls noticeably easier on asphalt than knobby fat tires.
TractionMixedGrip is fine on gravel and hardpack but weaker in mud, snow and wet loose ground.
StabilityPraisedThe wide 4.0 inch contact patch is described as planted and confidence-inspiring.
BuildMixedThe reinforced compound is seen as durable, though the 30 TPI casing is basic.
MountingPraisedBuyers report the folding bead seats easily on standard 20x4.0 rims.

About the Auxfore

The Auxfore 20"×4.0" fat tire is made for e-bikes and fat-tire bikes. It has a flat, block-pattern tread designed to reduce rolling resistance on paved streets while still giving traction on gravel and mixed terrain.

The tire has a wide contact patch and a reinforced rubber compound for stability, durability and puncture resistance. It is suited to city commuting, light trails and leisure riding. It fits most 20"×4.0" fat-bike frames and e-bike kits.

It has a folding bead.

Tire size: 20" × 4.0"
ETRTO: 102-406 mm
TPI: 30 TPI
Max pressure: 30 PSI
Max load: 198 lbs (98 kg) per tire
Bead: Folding
Tread type: Block
Compatibility: Most 20"×4.0" fat-bike frames and e-bike kits

Specifications

Tire Size: 20x4.0 inchSource
ETRTO: 102-406 mmSource
T.P.I: 30 TPISource
Max Inflate To: 30 P.S.ISource

Questions and answers

Will it fit my 20-inch fat bike?: It fits most frames and e-bike kits built for 20x4.0 tires. Check your frame and rim clearance before buying, since some narrow frames run tighter.
Is it good for off-road riding?: It handles gravel, hardpack and light trails. The flat block tread is not made for deep mud or snow, where a knobbier tire grips better.
What pressure should I run?: The tire is rated to a maximum of 30 PSI. Lower pressure softens the ride and adds grip; higher pressure rolls faster on pavement.
Is it tubeless compatible?: The maker does not state a tubeless rating. Treat it as a tube-type tire unless your rim and setup are confirmed otherwise.
How much weight can one tire carry?: Each tire is rated for up to 198 lbs (98 kg) at 30 PSI. Stay within that per-tire limit when loading a cargo e-bike.
Is it worth it over a knobby fat tire?: For commuting and paved or mixed riding, yes: it rolls easier and rides quieter. For serious off-road use, a more aggressive tread is the better pick.
Where is the Auxfore cheapest?: At Hycline, for $44.99, as of our latest check.
What do buyers say about the Auxfore?: Rated 4.8 out of 5 from 12 ratings.