MTB XD 12 Speed 9-50T Cassette Ultralight

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Ultimate MTB 12 Speed 9-50T ULT / ULT pro XD Cassette Rainbow

XD Compatible
Material : High strength steel (9-42T) and 7075 Alloy(50T)
please install it with 40N.m
Weight : about 375g(ULT) / 397g(ULT pro)
Color : rainbow (everyone is different)

M7100 +12s Gold Chain + 9-50T ULT in the video. you can use any 12 speed chain.

Ultimate series

Cassette offers a larger range, more value and lighter weight than the competition. Now, our ULT cassette has an improved structure for smoother shifting.

9-50T 556% RANGE

The new 9-50T cassette weighs in at 375 grams, and has a 556% gear range


What is the difference between ULT and ULT pro?

The ULT pro, chain will not fall when the pedaling back. Increase 50T thickness to accommodate greater pedaling power.(sure, that cause to added a little weight)

The ULT pro, How is it working?

please check the 1×12 9-50T groupset in ZTTO Official Store, You will find the video for 9-50T ULT pro Cassette.

9T ! We did it

9T not only increased the range, but also reduce the weight of the system, because there is a greater range allows you to use a smaller chainring, also reduces the risk chainring hit stone

Light Weight 375g(ULT)

Light weight and strong, a perfect balance

CNC Made, Precise Shifting Performance

XD Compatible

this cassette is compatible with XD hub only, just like XX1 XG1299 cassette, please note.

Rainbow Painting

The special processing technology makes the cassette show beautiful color in the rotation.

Write at the end

No matter what cassette you use, first, make sure the derailleur hanger is straight. you can use a hanger alignment gauge to check. In fact, many people know this, but when we get the new cassette, we couldn’t wait to install it, so we forgot to check it, why are we reminding you here? Because this situation just happened, a buyer, he said that the cassette of other famous brands can work normally, but ours can’t. We discussed this for a long time, and finally we found out that it was caused by the bend of the hanger, which was interesting. When we find that some famous brand cassettes can still be used when the hanger is bent! (of course, not perfect, there is some clarking noise) it is always difficult to admit that others have done well, isn’t it? That’s ok, we will continue to work hard and improve product performance, now we can guarantee that our products work good as well as famous brands under normal conditions. Thank you for your support 🙂 Best regards.


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Packages from our warehouse in China will be shipped by ePacket or EMS depending on the weight and size of the product. Packages shipped from our US warehouse are shipped through USPS.

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Location *Estimated Shipping Time
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Canada, Europe 10-30 Business days
Australia, New Zealand 10-30 Business days
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Asia 10-20 Business days
Africa 15-45 Business days
*This doesn’t include our 2-5 day processing time.

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All orders can be cancelled until they are shipped. If your order has been paid and you need to make a change or cancel an order, you must contact us within 12 hours. Once the packaging and shipping process has started, it can no longer be cancelled.


Your satisfaction is our #1 priority. Therefore, you can request a refund or reshipment for ordered products if:

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*You can submit refund requests within 15 days after the guaranteed period for delivery (45 days) has expired. You can do it by sending a message on Contact Us page

If you are approved for a refund, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 14 days.


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We try our best to make your shopping experience not only pleasant, seamless and hassle-free, but also secure.


Enjoy flexible international shipping services that currently operate in over 200 countries across the world.


It's okay to change your mind! You can send your order back for a full refund, we've got you covered with our full Buyer protection.


Brand new products are available on a regular basis.


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Knowledgeable and professional support team is always happy to help you.


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