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OVERDRIVE 2 HEADSET INSTRUCTION
The Propel and Envie series bikes feature OverDrive 2 to offer unprecedented steering perfor-
mance with no additional weight. The OverDrive 2 headset features massive 1 1/4-inch top and 1
1/2-inch bottom bearings and provides up to 30 percent more torsional steering stiffness.
Once the headset assembled, make sure that some play exists between:
Steerer tube
Fork structure
CAUTION:
WARNING:
The fork has been designed to optimize performance. Do not modify the fork
by drilling or filing. Any modification will affect the fork structure and damage it. This may
result in serious personal injury or death.
There is no minimum clearance value but only a recommended value:
the fork crown and the bottom of the headtube
the top of the headtube and the conical spacer
The steerer tube of the Propel and Envie forks are constructed with carbon fiber material for light
weight and optimized stiffness.
Do not file the fork safety tabs or drill any holes in the fork structure.
Please contact your authorized Giant dealer to modify the steerer length to your preference. If you
are a qualified professional mechanic, please follow these instructions:
Always use a quality hacksaw with a fine-tooth
blade when cutting the steerer tube. A poor
quality blade could damage the steerer material.
Lay the fork on a flat, stable surface. Use a pro-
fessional saw guide to help you cut. Measure
twice, cut once!
Do not clamp the composite steerer with more
than 8Nm of torque. Over-clamping force could
damage the steerer tube.
A professional saw guide for steerer cutting is
must to be used. For example: PARK TOOL
Oversized Adjustable Saw Guide.
So the steerer rotates freely and easily without resistance.
To learn more about OverDrive 2 technology introduction, please visit the Giant website at giant-
bicycles.com.
lower clearance : 1.0mm
upper clearance : 0.5mm
CONICAL SPACER
WITH SEAL
COMPRESSION RING
TOP BEARING(1’’1/4)
OVERDRIVE HEAD TUBE
TOP BEARING(1’’1/2)
TOP BEARING(1’’1/2)
GREASE inside and outside
GREASE inside and outside
GREASE bearing race
GREASE inside and outside
GREASE bearing race
0.5
1.0
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COMPOSITE FRONT FORK
1.
2.
3.
4.
Front reflector
Summary of Contents for Envie series
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