coupler

FIXIE Inc. | Recep Ye�il & Holger Patzelt GbR | Moningerstrasse 13 | D - 76135 Karlsruhe | Germany Fon: +49 (721) 156 72 44 | Fax: +49 (721) 132 07 88 | e-Mail: office@fixie-inc.com

cycles-for-heroes.com

10 Nm

coupler

FIXIE Inc. | Recep Ye�il & Holger Patzelt GbR | Moningerstrasse 13 | D - 76135 Karlsruhe | Germany Fon: +49 (721) 156 72 44 | Fax: +49 (721) 132 07 88 | e-Mail: office@fixie-inc.com

cycles-for-heroes.com

Tension Requirements

Proper belt tension is critical to maintain optimum drive operation.

Too low of tension will allow your drive to jump teeth. This is known as “ratcheting”. Ratcheting your drive will result in a popping sound. This event may lead to damage of the carbon tensile cords inside your belt. Damage to these cords will reduce the life of your drive, and may lead to belt failure. Proper tensioning of your drive will usually eliminate ratcheting.

Too high of tension can cause damage to your bearings. It can also increase wear on your belt and sprockets. You may notice too high of tension through a perceived drag feeling in your drive. Again, proper tensioning of your drive will eliminate these problems.

Tension can easily be set properly using the tension tester tool. This tool has two red zones with a green zone in the middle. Proper tensioning is achieved when the measurement arm registers in the green zone. Tension within the green zone can vary somewhat. Depending on the size and strength of the rider, tension can be varied while staying within the green zone, until proper tension is found. For more explanation on how to use a tension tester tool, please see Tension Tester Instructions.

If proper tension is needed, but the tension tester tool is unavailable, the force deflection method can be applied. The force deflection method is simply deflecting the belt a prescribed amount with a given amount of force. Proper tensioning is achieved by deflecting the belt 1/2” with approximately 5-10lbs of force. With any tensioning procedure, it is recommended to rotate the drive and recheck tension several times. This is because tension will vary within the drive due to part tolerances.

Please Review Related Documents:Tension Tester instructionsBelt Alignment and Tensioning Instructions

Belt Alignment & Tensioning Instructions

Note: These instructions are for a frame with horizontal dropouts. Frame setup may vary. Please consult frame manufacturer for proper alignment directions.

To achieve correct belt alignment, proper spacing of rear sprocket is required. Spacers are used to position rear sprocket so that front and rear sprockets line up along the same parallel plane. (Contact Manufacturer for additional spacing instructions.)

Procedure 1. Place wheel into dropouts. Minimize center distance between axle and bottom bracket by

backing out tensioner bolt(s) completely, and sliding wheel as far forward as possible. 2. Slip belt onto rear sprocket. 3. Slip belt onto front sprocket.

NOTE: Do not pry belt onto sprocket or “roll” belt on by rotating cranks. Doing so could damage the belt and lead to failure.

4. If needed, loosen disc brake caliper housing. 5. Tighten tensioner bolt(s) on drive side until belt approaches proper tension. NOTE: Proper belt tension is critical to maintain optimum drive operation; the following are two methods used to check belt tension:

a. Checking tension with the tension gauge: Place gauge longitudinally on the center of the belt span. Depress pressure pad slowly until you hear a "click” sound. Remove gauge. Indicator arm should register in the green section of the gauge.

b. Checking tension by hand: Applying 5 lbs to 10 lbs of pressure on the center of the belt span, the belt should deflect about �-inch. (For detailed tensioning instructions, please review the Tension_Requirements.PDF document) 6. Adjust tensioner bolt(s) on non-drive side until wheel is roughly centered between stays. 7. Back pedal and front pedal 10-15 times and check alignment of belt on rear sprocket.

Edge of belt should slightly touch or come just short of touching inside flange of sprocket (within 1mm) as seen in Figure A. Adjust tensioner bolt(s) as needed. Figure B shows incorrect belt alignment.

Figure: A Figure: B

NOTE: Tightening drive side (or loosening non-drive side) tensioner bolt(s) steers belt toward the flange on the rear sprocket. Choose one or the other depending on tension of belt. 8. Back pedal and front pedal 10-15 times and re-check belt alignment. Adjust as needed

while maintaining proper belt tension. 9. Tighten hub bolts (or quick release) fully and re-check alignment. 10. Make final adjustments if needed. Remember to retighten disc brake caliper housing if it

was loosened during belt installation. NOTE: Wheel might not be perfectly centered in stays after proper alignment is achieved. Some variance is possible due to frame alignment, wheel dish and tire shape. Please Review Related Documents: • Belt_Handling_Instructions.PDF • Tension_Requirements.PDF • Tension_Tester_Instructions.PDF

Belt Handling Instructions

Gates Carbon Drive™ Belts are extremely durable and offer long life when properly handled. However, caution must be used before and during installation to avoid damaging the carbon tensile cords that make up the backbone of the belt’s strength. Excessive bending and twisting creates crimps which can lead to belt breakage under high load.

When installing the belt, do not pry the belt on, or “roll” it on by rotating the cranks. Belt should be installed loosely and then tensioned when in place.