Orange Mountain Bikes

Orange Mountain Bikes - ST4 Frame Spec Sheet

From the 2012 Archive


The ST4 may take the name of the old, but it’s all new, a veritable conglomerate of design made to continue our own inimitable niche. The original brought responsive trail handling to a bike designed for regular XC. A low slung trail missile which pedaled efficiently and descended with a rapidity that astounded the most fervent critic. A bike that doesn’t fit a category, but creates one.

Built for all-day missions, the ST4 uses a low leverage ratio to produce 110mm of buttery smooth travel. Rather than use a shorter 165 mm shock the ST4 takes a lesson from the blood, running a 190mm custom tuned Fox RP23 shock to give 100mm perfectly controlled progressive travel driven through single pivot linkage actuated design. The geometry that made the original a classic, but updated to markedly stiffen the chassis laterally and incorporate linkage development from the Strange department.

2010 Singletrack readers award winner

If you want to redefine the rules of XC, the ST4 starts afresh. It might not fit the existing industry tags, but it’s built for the way most of us ride. Up, down and along, the ST4 is the remedy to your bike pondering woes. Just get on and ride, the ST4 does the rest.

Why the ST4 Pro?

The ST4 is that unusual bike which doesn’t masquerade as anything other than a sweet handling XC bike. No modern tag terms, just a fantastic bike built for all-day rides and the rolling trails we love to ride at home. If you want more travel, look at the Five, less travel, consider a hardtail.

Read the reviews for the ST4...

Singletrack ST4 Test

Singletrack Issue 48

Dirt ST4 Test

Dirt - August 2008

ST4 Frame Specifications

RRP £1,399.99
Sizes 16,18,20
Colour Disco Black
Tubeset 6061-T6 Reynolds Custom Butted Aluminium Tube
Rear Shock Fox Evolution RL
Swing Arm QR Axle


ST4 Geometry
Moulded and Formed 6061-T6/Custom Butted Aluminium Tube
Frame Size DIVA 16" 18" 20"
A. Head Angle 68° 68° 68° 68°
B. Seat Angle 74° 74° 74° 74°
C. Top Tube 521 556 576 599
D. Effective TT 540 580 600 620
E. BB Height -6 -6 -6 -6
F. Chainstay 425 425 425 425
G. Head Tube 120 120 120 140
H. Wheelbase 1046 1104 1125 1147
T. Rear Travel 110 110 110 110
Shock Length 190 190 190 190
Seat Tube Ø 27.2 27.2 27.2 27.2
Standover 684 699 736 786
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.