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2025 Author

Aura XR4

An aluminum frame gravel bike with mid-range components and shimano mechanical disc brakes.
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Weight23.8 lbs  
FrameAluminum
SuspensionRigid
ForkCarbon
Wheels700c Aluminum
Drivetrain2 × 10
GroupsetGRX 600, GRX 400
BrakesShimano Mechanical Disc
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Insights
Ride Feel

Based on frame geometry and build specs.

Rider Position
relaxedaggressive
Terrain
smoothrugged
Aura XR4
Other Gravel bikes
Gearing

A bike with lower gearing will be easier to ride up steep hills, while a higher top end means it will pedal faster down hills.

Lowest gear

(climbing)

36 mph

Aura XR4

36 mph

Similar Bikes

Highest gear

(descending)

Sizing
48cm

5'0" – 5'4"

50cm

5'2" – 5'7"

52cm

5'6" – 5'11"

54cm

5'9" – 6'1"

56cm

6'0" – 6'4"

58cm

6'2" – 6'9"

Rider Fit Notes

None yet.

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Geometry
Specs
Build
Frame

triple butted alloy 6061, max tyre size 700 × 42C

ColorRed

Fork

AUTHOR carbon, 1.5" tapered

Stem

AUTHOR alloy

Handlebar

PROMAX, 420 / 440 / 460 mm

Saddle

AUTHOR Guru

Seatpost

AUTHOR alloy (27.2)

TypeRigid

Groupset
Rear Derailleur

SHIMANO GRX 400

Front Derailleur

SHIMANO GRX 400

Crank

SHIMANO GRX 600, 46-30 teeth, 172,5 / 175 mm cranks

Shifters

SHIMANO Tiagra (20)

Cassette

SHIMANO CS-HG500-10, 11-34 (10)

Chain

KMC X10

Brakes

SHIMANO RS305, disc mechanical (160 mm rotors)

TypeShimano Mechanical Disc

Wheels
Rims

JALCO SRD 21, 32 holes

Spokes

black stainless steel 2.0 mm

Front Hub

QUANDO Road Disc, 12 × 100 mm thru front axle, 12 × 142 mm rear axle, 32 holes

Rear Hub

QUANDO Road Disc, 12 × 100 mm thru front axle, 12 × 142 mm rear axle, 32 holes

Tires

PANARACER Gravel King SK Sport, 700 × 38C (40-622), max tyre size 700 × 42C

Rider Notes
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First added October 26

Last updated May 30