Premium package includes integrated barstem and Ceramicspeed T47 BB 

ETA :: 4 weeks from order

DISCOVER THE ALL-ROAD ALL-STAR
Speed is your goal. Every ride, whatever the surface, faster is what counts, and this is the gravel bike you’ve been waiting for. The OSTRO Gravel takes its ‘win everywhere’ mentality from its road racer stablemate, the OSTRO VAM, and is likewise developed to dominate its category with incredible aero, superior handling, high stiffness and low weight. With a tire capacity of 45mm, it’s ready to go anywhere, fast.

REAL-WORLD GRAVEL AERO
Gravel racing is fast and aero really matters, but it isn’t as fast as road racing so the requirements are different. The OSTRO Gravel frame is carefully optimized for the speeds at which you’ll be riding. Our team used a ‘zoned aero’ strategy which focused the front of the bike on aerodynamics because it meets clean, or freestream, air flow, and the rear of the bike on lightness, where the air flow is too chaotic and ride quality is the priority. In particular, a lot of time was spent on the head tube, where an all-new tube shape unlocked significant drag reductions by manipulating the ‘laminar separation bubble’ that occurs near the front of airfoils at lower speeds. The tech is rooted in aerospace but all you really need to know is that the OSTRO Gravel will get you to your finish line faster, and by minutes, not seconds.

45MM TIRE CLEARANCE
The OSTRO Gravel offers a generous 45mm of tire clearance in both 700c and 650b, giving you the options and possibilities to tackle the toughest routes and events. This is a real figure, with 4mm of clearance either side in accordance with ISO standards, so the OSTRO Gravel is super-capable in muddy conditions. That was proven at the queen of gravel races, the 2022 Unbound 200, where heavy rain made the course brutal and the OSTRO Gravel was ridden to a top-10 finish.

BLACK INC INTEGRATED AERO BARSTEM
Aerodynamics and ergonomics - the flared Black Inc Integrated Aero Barstem takes both to new heights, because riding far and riding fast are not mutually exclusive. Its mid-depth aero profile is the outcome of tireless research and development, initially using CFD (computational fluid dynamics), then by testing prototypes in a wind tunnel. The result is that it outperforms leading brands of aero road bars and does so at an exceptionally low weight. What’s more, it’s as comfortable as it is fast, thanks to highly refined ergonomics which provide more back sweep for a natural wrist angle on the tops, more wrist clearance and hand positions thanks to the chamfered corners, a drop shape that accounts for the longer reach of the latest Shimano and SRAM shifters and a 7-degree flare that starts below the shifter mounting point. The flare adds 3cm of width in the drops, a figure carefully judged to suit all applications as the Integrated Aero Barstem is designed to pull double-duty for both the OSTRO Gravel and OSTRO VAM. For gravel, enjoy the extra control of the wider drops in descents; for road use, select your usual drop width and benefit from the much more aero position achievable on the narrower hoods. The new Integrated Aero Barstem also gains a GoPro-style computer mount, adding angle adjustment and a more supported second mount for a light or action camera.

STEERING GEOMETRY OPTIMIZED FOR ALL TIRE SIZES
Many all-road and gravel bikes struggle to deliver steering that’s effective and confident both on- and off-road, typically ending up with an unsatisfying compromise of soft handling and modest tire capacity. The OSTRO Gravel breaks that mold by making the tire size an integral part of the geometry. Wider tires also have a greater outside diameter (or rolling circumference) which increases the true, or ‘resulting’ trail of a bike; narrower tires have a smaller outside diameter which reduces resulting trail. These outcomes match the handling response you want when riding those respective tires, so we designed with resulting trail as the priority. We selected a trail value on the slightly faster handling side for gravel use, given the bike’s racing focus, while prioritizing head tube angle when selecting our fork rake. This leads to a fast handling gravel bike on 43mm tires and an equally satisfying and precise all-road machine on 32s, with no low-speed wheel flop.

FRAME	TeXtreme®, Toray®, Nippon Graphite® Pitch-Based Fiber
FORK	OSTRO Wide Stance Fork
SEATPOST	0 and 20mm setback available
BARSTEM	Black Inc Integrated Aero Barstem Reach 80mm, drop 120mm. Multiple stem lengths and bar widths available
HEADSET	CeramicSpeed SLT 1.5″ bearings
HEAD TUBE DIAMETER	1.5″ upper and lower
SADDLE RAIL CLAMPS	7x7 and 7x9
BOTTOM BRACKET	CeramicSpeed T47A Aluminium cups / CeramicSpeed bearings available for DUB, 24mm, or Ultra-Torque
CABLE ROUTING	Internal
COMPATIBLE COMPONENTS	Electronic
BRAKE TYPE	Disc
MAX ROTOR SIZE	160mm front & rear
MAX CHAINRING	52-tooth
FRONT AXLE	12 x 100mm thru-axle
REAR AXLE	12 x 142mm thru-axle
WHEELSET	Black Inc THIRTY FOUR
WHEEL SIZE	700c
MAX TIRE CLEARANCE	45mm measured
WEIGHT	950g
MANUFACTURER WARRANTY	Limited Lifetime Warranty

 

SIZE	49	52	54	56	58	61
A STACK	515	535	555	580	605	625
B REACH	377	385	394	402	412	422
C HEAD TUBE ANGLE	71.2°	71.3°	72.2°	72.3°	72.3°	72.3°
D BB DROP	76	76	74	74	74	74
E TRAIL	62	62	61	61	61	61
F FORK RAKE/OFFSET	56	56	50	50	50	50
G CHAINSTAY LENGTH	420	420	420	423	425	425
H WHEELBASE	999	1013	1014	1029	1047	1069
I BIKE STANDOVER HEIGHT	750	767	786	802	820	847
J SEAT TUBE LENGTH	450	468	483	500	523	545
K SEAT TUBE ANGLE	74.5°	74°	74°	73.5°	73.5°	73.5°

*All dimensions in mm