Gates Carbon Drive CDX Rear Sprocket – 9-spline, for Shimano cassette hubs - 20T
The Gates Carbon Drive CDX Rear Sprocket – 9-spline, for Shimano cassette hubs is the rear sprocket of the strongest Gates line, in wear-resistant aerospace stainless steel, for belt-driven bikes with a 9-spline cassette hub. It is available in 19, 20, 21, 22, 23, 24, 26, 28, 30, 32, 34 and 39 teeth, 11 mm pitch.
Why choose this rear sprocket?
Stainless steel. Wear-resistant aerospace stainless steel from the strongest Gates line. 
9-spline fit. Made for hubs with a Shimano 9-spline interface, the common cassette-hub standard. 
Many gear choices. 12 tooth counts from 19 to 39 teeth for the gearing you want. 
CenterTrack, 11 mm pitch. Runs with CDX, CDC and CDN belts.
Which hub does it fit?
This sprocket is made for hubs with a 9-spline interface, such as Shimano cassette hubs. If you are not sure that your hub has this interface, send us the hub model and we will confirm the match before you order.
CDX: what that means
This sprocket belongs to the Gates CDX line: the strongest Gates line, rated at up to 4× the life of a chain and for hub motors and mid-drive e-bike motors up to 120 Nm. You can combine it with a CDX belt for the complete CDX setup; CDX, CDC and CDN are all CenterTrack parts with an 11 mm pitch, so the lines fit together and each part keeps its own rating.
Technical data
| Property | Value |
|---|---|
| Gates line | CDX |
| Material | Aerospace stainless steel (Gates Europe data) |
| Colour | Silver |
| Mount | 9-spline interface (Shimano cassette hubs) |
| Tooth count | 19, 20, 21, 22, 23, 24, 26, 28, 30, 32, 34, 39 T |
| Pitch | 11 mm |
How the Gates rear sprockets compare
| CDX (this sprocket) | CDX:Black | CDC | CDN | |
|---|---|---|---|---|
| Material (Gates Europe data) | Aerospace stainless steel | Black-coated steel (KTL) | Chrome-moly steel | Chrome-moly steel |
| Colour | Silver | Black | Silver | Silver |
| Belt line | Top of the Gates range: touring, off-road, cargo, all-year riding | Same CDX belt line, in black | Daily commuting and mid-drive e-bikes up to 75 Nm | Casual city riding and hub-motor e-bikes |
| Rated life of the belt line (Gates, vs. a chain) | 4× | 4× | 3× | 2× |
| E-bike motors (Gates) | Hub motors and mid-drive up to 120 Nm | Hub motors and mid-drive up to 120 Nm | Hub motors and mid-drive up to 75 Nm | Hub motors |
Frequently asked questions
Which tooth count should I choose?
It depends on your gearing and the front sprocket, and the belt length follows from both. Gates offers a free Gearing and Center Distance Calculator in its Gates Sanity Check. Send us your frame, crank and hub and we will help you choose.
Is a 9-spline sprocket a replacement for a cassette?
Yes, in a belt drive it takes the place of the cassette: one sprocket on the cassette hub’s 9-spline interface drives the rear wheel.
What do CDX, CDC and CDN mean?
They are Gates’ three belt-drive lines for bicycles: CDX (top of the range), CDC (mid-range) and CDN (entry level). Gates rates CDX for hub motors and mid-drive e-bike motors up to 120 Nm, CDC for mid-drive motors up to 75 Nm, and CDN for hub-motor e-bikes and casual riding.
When should I replace a sprocket?
Check your sprockets from time to time. Worn teeth cause noise, tooth jump and faster wear on the belt, so replace the sprocket when the teeth are worn. A sprocket in good condition has even, undamaged teeth.
Sizes and Gates part numbers
Find your sprocket by its tooth count. The Gates article number and type designation are marked on the sprocket, so you can match a replacement exactly.
| Teeth | Gates article no. | Gates type designation |
|---|---|---|
| 19T | 7898-00743 | XF1119S9MN |
| 20T | 7898-00755 | XF1120S9MN |
| 21T | 7898-00762 | XF1121S9MN |
| 22T | 7898-00745 | XF1122S9MN |
| 23T | 7898-00565 | CT1123SMN |
| 24T | 7898-00759 | XF1124S9MN |
| 26T | 7898-00761 | XF1126S9MN |
| 28T | 7898-00758 | XF1128S9MN |
| 30T | 7898-00754 | XF1130S9MN |
| 32T | 7898-00757 | XF1132S9MN |
| 34T | 7898-00756 | XF1134S9MN |
| 39T | 7898-00805 | XF1139S9MN |
About Gates Carbon Drive
Gates Corporation has been a global leader in power transmission and belt drive technology since 1911. In 2007 it launched the first belt drive system for bicycles, and today more than 1,000 bike brands worldwide use Gates Carbon Drive, from city and trekking bikes to e-bikes, cargo and mountain bikes.
On the bike
