Orange Mountain Bikes

Orange Mountain Bikes - ST4 Frame Spec Sheet

From the 2010 Archive


The ST4 is a departure for us, both visually and in terms of ride-feel. This is a trail-bike, through and through and, while it’s happy on the steep stuff, where it excels is in nailing unpredictable trails at all speeds. Show it a twisted, rooty, slatey trail heading deeper down into the woods, or a ten minute, slow speed, pick-a-line, rocky Lakeland climb and it’ll conquer both.

The ST4 sits up in its travel, ready for anything and with a trail-tuned geometry giving telepathic steering control at any speeds – up or down hill. If you’re a dyed in the wool hardtail rider, you’ll find yourself going faster than you ever thought without sacrificing the pinpoint accuracy you’re used to. If you’re a full suspension fan, tired of the ‘buck and bob’ of some suspension designs, you’ll love the bottomless feel of the ST4s suspension that still allows 2mph power moves on previously impossible climbs.

Whether fighting the unknown of a dark 24-hour race course, pinning a trail centre’s black run on a rainy day, or just out to enjoy the ride, the ST4 is ready to motor.


Power, they say, is nothing without control. While you provide the power, the Orange ST4 is the new definition of control. Suspension is basically there to control the bike’s geometry. On a 110mm travel bike you would most likely expect to find a 165mm shock. On the ST4 we run a 190mm custom tuned Fox RP23 shock activated by our ROCKR link to give 100mm of supple rear wheel travel. By running at a 2:1 low leverage ratio, we can accurately control the stroke of the shock better than ever before and dial in the best ride quality for a whole mix of terrain.

Why the ST4 Pro?

The ST4 Frame packs a punch well above its weight and short travel. Perfect platform on which to build up your own spec.

For the full packages, get the ultimate ST4 with a ST4 SE, get a benchmark pro spec ST4 Pro or keep it simple with an ST4 S.

Read the reviews for the ST4...

Dirt ST4 Test

Dirt - August 2008

ST4 Frame Specifications

RRP £1,329.99
Sizes 16,18,20
Colour Passion Red
Tubeset Molded and Formed 6061-T6/Custom Butted Aluminium Tube
Rear Shock Fox Float RP23 XV BoostValve
Swing Arm QR Axle


ST4 Geometry
6061-T6 Custom Butted Aluminium
Frame Size 16" 18" 20"
A. Head Angle 68° 68° 68°
B. Seat Angle 74° 74° 74°
C. Top Tube 556 576 599
D. Effective TT 580 600 620
E. BB Height -6 -6 -6
F. Chainstay 425 425 425
G. Head Tube 120 120 120
H. Wheelbase1104 1125 1147
T. Rear Travel 110 110 110
Shock Length 190 190 190
Seat Tube Ø 27.2 27.2 27.2
Standover699 736 786
Unless otherwise indicated all measurements are in mm.
Frame angles are measured static, without rider sag.
Bottom bracket height measured from axle.
Fork and Ride Guide

Prices and Specifications are liable to change without notice.