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Our superlight, innovative and high-quality children's bikes offer your child no end of safe riding fun.

SunRace cassette 9s-40

The high-quality SunRace cassette is an optional extra that can be added to woom OFF/OFF AIR 5 and 6 mountain bikes to make it easier to tackle steep stretches.

In stock & delivered in 3-5 business days
Delivery time: 5–10 working days incl. VAT plus shipping Plus customs fees where applicable*
€29.00

High-quality cassette incl. lockring supplied by our partner SunRace, with extremely small ratio jumps designed for a wider range of gradients for even more challenging off-road cycling than with the standard cassette.

Please note: You can add this cassette to your woom OFF/OFF AIR 5 or 6 mountain bike as an optional extra. If you're looking to replace the standard cassette your bike came with, please contact our customer service team at [email protected].


- Suitable for: woom OFF and woom OFF AIR in sizes 5 and 6

- Teeth: 11–40

- Ratio spacing: 11-13-15-18-21-24-28-34-40

- Coated black

- Weight: 498 g

- Special tool required to replace cassette.