Shimano 7900 Dura Ace 11-21

In stock
€239.00 €219.00
Hurry up! only 1 left


Free shipping on orders over €20

Next day delivery in Ireland


Application: Road
Gearing: 10-speed
Gradation: 11-21, 11-23, 11-25, 11-28, 12-23, 12-25, 12-27
Sprocket Material: steel, titanium
Freehub Body Compatibility: Shimano MTB
Note: compatible with Shimano Road 11-speed with a 1.85 mm spacer

Technical Information:

Series: Dura Ace 7900
Spider: 2 (aluminium)
Recommended Chain: HG 10-speed (e.g. CN-6701)


- HG cassette
- weight-optimised sprocket design
- improved shifting function for more precise shifts and less weight
- super-light, high-strength aluminium carrier
- the four largest sprockets (7 to 10) made of titanium for less weight, higher rigidity
- diverse gradations
- nickel-plated steel sprocket , anodised lockring


In combination with Hyperglide (HG) chains, HG sprockets ensure fast and responsive indexed shifting. HG sprockets have specially positioned shift ramps and tooth profiles that improve chain control during shifting. Fast, fluid and silent shifting is the result. Conventional sprockets cause the chain to ride up and over the gear teeth before engaging the sprocket. HG sprockets guide the chain quickly and directly to the next sprocket without override.


- Gradation: 11-12-13-14-15-16-17-18-19-21 t
- Manufacturer Part Number: I-CS790010121

- Gradation: 11-12-13-14-15-16-17-19-21-23 t
- Manufacturer Part Number: I-CS790010123

- Gradation: 11-12-13-14-15-17-19-21-23-25 t
- Manufacturer Part Number: I-CS790010125

11-27: sold-out
- Gradation: 11-12-13-14-15-17-19-21-24-27 t
- Manufacturer Part Number: I-CS790010127

- Gradation: 11-12-13-14-15-17-19-21-24-28 t
- Manufacturer Part Number: I-CS790010128

- Gradation: 12-13-14-15-16-17-18-19-21-23 t
- Manufacturer Part Number: I-CS790010223

- Gradation: 12-13-14-15-16-17-19-21-23-25 t
- Manufacturer Part Number: I-CS790010225

- Gradation: 12-13-14-15-16-17-19-21-24-27 t
- Manufacturer Part Number: I-CS790010227


- 1 x Shimano Dura Ace CS-7900 cassette
- 1 x Shimano aluminium lockring
- 1 x Shimano 1 mm spacer (to mount to 8-/9-/10-speed freehub bodies)


Ireland and UK

Free delivery (minimum order €20) in the Republic of Ireland, UK and Northern Ireland for all orders placed on our website.

Exceptions to the above rule are heavy goods, weighing 20kg or above. The shipping cost for heavy goods is €20.

All orders are processed, packaged and shipped the same day (on orders received before 3pm). Once goods have been shipped, the customer will receive an email with a tracking number.

Next day delivery within Ireland. U.K. delivery times will vary.

If your order is out of stock we will contact you immediately with an expected delivery date.

European and Worldwide

We offer worldwide shipping. The cost of shipping depends on the destination and weight of goods.

Please contact us for a quote on shipping costs to your destination.

Bike Shipping

Bikes are inspected by our trained bicycle mechanics to ensure that all parts are correct and functional before delivery.


Click here to view our returns policy.

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