www.carbondrivesystems.com

The Gates carbon drive system is an amazing innovation and while it is an old concept, it is new to many folk in cycling so we have some FAQ's here to help you get up to speed.

What is the Life of the system?
In laboratory testing, the Carbon Drive System lasts more than twice the life of chain.  Chains are often replaced due to stretch and wear rather than actual failure.  The Carbon Drive belt does not stretch, so the smooth running performance remains consistent throughout its life.

Can I derail the belt to change gears, or am I stuck with single speed only?
A belt cannot be derailed because it needs alignment and tension to work properly.  However, having multiple gears is still available through the use of internally geared hubs, gearboxes, and multi-speed bottom brackets.

What size sprockets are available?
For a chart of what types, sizes, and expected availability, please click here . 

What are the benefits to the Carbon Drive System?

Life - lab testing has shown the Carbon Drive belt to last more than twice the life of chains.

Light Weight - The entire system weighs in at over 226 grams lighter than an equivalent chain drive.

No Stretch - The Carbon Drive belt does not stretch over time like a chain.  This means you don't have to re-tension the belt, or replace the belt due to stretch.  This also means no excessive wear on sprockets due to stretch.

Smooth - The instant engagement of the Carbon Drive system gives an unparalleled smoothness that chains can't meet.

No Noise - The Carbon Drive belt is virtually silent.

No Lubrication - The Carbon Drive belt does not need lubrication to keep it running smooth and silent; this means no grease on your hands, socks or pants.

Open Tooth - the patented open tooth profile of the Carbon Drive sprockets allows mud, dirt, rocks, and other debris to pass right through without a moment of hesitation.

What are the drawbacks of using a Carbon Drive System?
Because a belt cannot be broken and then reattached, the Carbon Drive System requires a special or modified frame. A belt also needs center distance adjustment for installation and proper tensioning.  Methods include adjustable dropouts (track forks), eccentric bottom brackets, or eccentric hubs.

INSTALLATION

How do I retro-fit a Carbon Drive System onto my current frame?
In order to retrofit a Carbon Drive System to a frame, you may need to modify the rear triangle.  The belt cannot be broken and reattached, so for a standard rear triangle, you'll need a way to get the belt through the frame. Belts also need adjustment for installation and tensioning. Several ways of doing this are: horizontal dropouts (track forks), eccentric bottom brackets, or eccentric hubs.

How much tension is needed, and how do I know when I have enough?
The best way to tension the Carbon Drive belt is to use our tension gauge. For directions on how to use the tension gauge.  If you don't have a gauge, you can use the "force/deflection" method.  Press down in the center of the belt span. The belt should move approximately ½ inch with 5 lbs of force.

Are there any special handling instructions for the belt?
Yes, there are special handling instructions for belts.  Mishandling belts can cause damage to the carbon tensile members inside of the belt, leading to premature failure.

Do I need a special crank or hub to use with a Carbon Drive System?
No, the sprockets for the Carbon Drive System have been engineered to fit onto many stock cranks and hubs. The front sprockets are made to fit both 4 bolt and 5 bolt cranks, and the rear sprockets have been designed to fit a standard Shimano 9-splined rear hub. There will also be several other options for internally geared hub mounting in the near future.  Please click here to view our product line.

Can I carry a spare belt with me on the trail?
Yes, you can carry a spare belt with you out on the trail. The spare belts are sold attached to a cardboard disk; it is recommended that you keep the belt attached to the disk for protection while in your pack. Proper handling is imperative to keep from damaging your belt.

MAINTENANCE

When should I replace components?
While you can expect extended life from your belt drive compared to chain, regular inspection and replacement intervals are still encouraged.  Sprockets should be inspected for damage such as bending or cracks.  Belts should be checked for cuts and tears or holes from stone damage.  NOTE:  Flaking off of the blue layer on the teeth is a normal part of break-in for a new belt.

My drive is squeaking or making noise, what's the cause, and how do I fix it?
The belt can make noise when forced to run hard against the flanges on the sprockets. This can be due to sprocket misalignment, wheel misalignment, or run out in the drive caused by damaged components. Spraying water on the belt may quite the drive for a few minutes, but the permanent solution is to correct the alignment or replace the damaged components. Another possible source of noise is a loose front sprocket. Using thread lock on the sprocket bolts alleviates this problem.