TheBurgtec Offset Shock Hardwareallows the head angle to be easily manipulated simply by shortening or lengthening the effective eye to eye of the shock. The Burgtec hardware allows between 1 and 1.5 degrees of angle alteration depending on the shock bolt size of your frame. 6mm frames will naturally get the greatest amount of alteration with the 8mm frames getting 1 degree. In recent times as the trend leans towards steeper and faster tracks the bushes have been used to relax the head angle. This makes the bike feel more stable at speed and even more planted on steep sections by throwing the front wheel further forward. The bushes can be used in the opposite way to steepen the head angle to improve the bikes geometry for sprinting if the track is more pedalling orientated ... More info