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If you’re looking to bleed your Shimano mountain bike brakes at home, you’re likely deciding between two popular kits: the CHUMXINY with 300ml of mineral oil and the YOUMAYSTORY with 120ml. Both promise to make the job easy, but the amount of fluid and included parts are very different.
This comparison is for the home mechanic who wants to save money on shop visits. The key trade-off is between getting a lot more fluid for future jobs versus a more compact, basic kit. I’ve used both, and one is clearly the better buy for most riders.
đ Quick Picks â My Top Recommendations
Best Overall: CHUMXINY 300ml Kit
Includes 2.5x more brake fluid (300ml) for multiple bleeds â Check Price â
Runner-Up: YOUMAYSTORY 120ml Kit
A more compact, basic kit with 120ml of fluid â Check Price â
Full Specs Comparison
Hereâs a detailed look at how the CHUMXINY and YOUMAYSTORY kits stack up on paper, based on the official product data.
The specs tell a clear story: the CHUMXINY wins on fluid volume and warranty, while the YOUMAYSTORY is the lighter, more recently popular kit.
Individual Product Breakdown
I looked at what each kit actually includes, how easy they are to use, and who would get the most value from them. Here are my honest takes after comparing them side-by-side.
CHUMXINY Brake Bleed Kit for Shimano Hydraulic Brakes
300ml Mineral Oil | Clear Funnel | 4.5/5 Stars (2,355) | 2-Year Warranty
- ăMultiple Replacementă2 Bottles of 150ml mineral oil brake fluid for...
- ăEasy to ObserveăThe funnel is clear plastic and you can clearly see...
- ăMetal ConnectorsăBrass connections are not easily broken.
This is the kit I’d recommend for most riders who plan to do their own maintenance. The 300ml of fluid is the standout featureâit’s enough for several full brake bleeds or topping up multiple bikes. The clear plastic funnel makes it easy to see air bubbles and fluid level, and the 4.5-star rating from over 2,300 reviews shows it’s a proven, reliable choice. It’s best for the dedicated home mechanic who doesn’t want to run out of fluid. My one gripe is that it’s a bit heavier and bulkier than the competition.
â Pros
- Includes a generous 300ml of mineral oil
- Longer 2-year warranty for peace of mind
- Highly rated with 2,355 customer reviews
- Clear funnel for easy visual monitoring
â Cons
- Heavier and bulkier package at 0.46 kg
- May be overkill for a single, one-time bleed
YOUMAYSTORY Brake Bleed Kit for Shimano Hydraulic Brakes
120ml Mineral Oil | Syringe & Funnel | 4.4/5 Stars (188) | 1-Year Warranty
- ăCompatible with Shimano Hydraulic BrakesăThis specialized brake bleed...
- ăComplete Brake Bleeder Kit for Hassle - Free MaintenanceăOur brake...
- ăHigh - Quality Brake Fluid for Peak PerformanceăThe mineral oil...
The YOUMAYSTORY kit is a solid, no-frills option that gets the job done. It includes 120ml of fluid, which is enough for one or maybe two bleeds if you’re careful. I like that it comes with a syringe for precise fluid handling, and it’s noticeably lighter and more compact than the CHUMXINY. With 800+ units bought last month, it’s clearly a popular pick. This kit is best for someone who just needs to service one bike right now and wants a simple, competitively priced solution. The main limitation is the smaller fluid supply.
â Pros
- Very lightweight and compact package (0.17 kg)
- Includes a syringe for accurate fluid control
- High recent sales (800+ past month)
- Competitively priced
â Cons
- Only 120ml of fluid included
- Shorter 1-year warranty
- Smaller review pool of 188 ratings
Which One Should You Buy?
Both kits are good, but the right one for you depends on how often you work on your bike and what you value most. I’ll match each one to specific types of riders.
CHUMXINY Brake Bleed Kit is right for you if…
- You maintain multiple bikes or plan to bleed your brakes several times a year and need the full 300ml of fluid.
- You want the security of a longer 2-year warranty on your tools.
- You prefer buying a proven product with a high 4.5-star rating from thousands of users.
YOUMAYSTORY Brake Bleed Kit is right for you if…
- You only need to service one bike right now and the 120ml of fluid is sufficient.
- You want the most lightweight and compact kit possible for easy storage.
- You’re looking for a competitively priced, basic kit to handle a single job.
â Who Should Skip All of These?
If you have hydraulic brakes from brands like SRAM, Magura, or Hope that use DOT fluid, these mineral oil kits are not compatible. You need a kit specifically for your brake system.
For most mountain bikers who plan to do their own maintenance, I recommend the CHUMXINY. The extra fluid is worth it, and you won’t have to worry about running out mid-job.
Frequently Asked Questions
Which brake bleed kit has more fluid, CHUMXINY or YOUMAYSTORY?
The CHUMXINY kit comes with significantly more fluid. It includes 300ml of mineral oil, while the YOUMAYSTORY kit has 120ml. That means the CHUMXINY gives you 2.5 times the amount, which is enough for several full brake bleeds. If you work on multiple bikes or want a supply for future maintenance, the CHUMXINY is the clear winner here.
Is the CHUMXINY kit worth it over the cheaper YOUMAYSTORY?
Yes, for most riders, the CHUMXINY is worth it. The extra upfront cost gets you 180ml more brake fluid, a longer 2-year warranty, and a product with a much larger review base (2,355 vs 188 ratings). If you see yourself bleeding brakes more than once, the CHUMXINY offers better long-term value. If you only need to do a single, one-time bleed, the YOUMAYSTORY is sufficient.
Which kit is easier to use for a beginner?
Both kits are designed to be user-friendly, but I’d give a slight edge to the CHUMXINY for a beginner. Its clear plastic funnel makes it very easy to see the fluid level and spot air bubbles during the bleed process. The YOUMAYSTORY includes a syringe, which is also helpful, but visual feedback is key when you’re learning. Both include instructions to guide you.
Do both kits work with all Shimano mountain bike brakes?
Yes, both the CHUMXINY and YOUMAYSTORY kits are specifically designed for and compatible with Shimano hydraulic brake systems. They use the correct Shimano mineral oil. You can use them on any mountain bike, road bike, or gravel bike equipped with Shimano hydraulic disc brakes.
Which brake bleed kit is more popular on Amazon?
Based on the data, the CHUMXINY kit has far more customer feedback with 2,355 reviews, indicating it’s been a popular choice for longer. However, the YOUMAYSTORY kit shows strong recent sales, with 800+ units bought in the past month. So, the CHUMXINY has broader historical popularity, while the YOUMAYSTORY is gaining traction quickly.
What’s the main reason to choose the YOUMAYSTORY kit?
Choose the YOUMAYSTORY kit if your top priority is a lightweight, compact, and competitively priced solution for a single job. Its entire package weighs only 0.17 kilograms, making it less bulky to store. It’s a great pick if you just need to bleed one bike’s brakes now and don’t plan on having extra fluid sitting around.
My Final Verdict
After comparing both kits, the CHUMXINY is my clear overall winner. It simply offers more value with 300ml of fluidâenough for multiple bikes or future bleedsâand backs it up with a strong 2-year warranty and excellent 4.5-star rating. The YOUMAYSTORY is a fine runner-up if you only need to service one bike right now and want the most compact kit.
If you’re on the fence, ask yourself how often you’ll bleed your brakes. If the answer is “more than once,” the CHUMXINY’s larger fluid supply makes it the smarter, more economical choice in the long run.
Best Overall: CHUMXINY 300ml Kit
- ăMultiple Replacementă2 Bottles of 150ml mineral oil brake fluid for...
- ăEasy to ObserveăThe funnel is clear plastic and you can clearly see...
- ăMetal ConnectorsăBrass connections are not easily broken.
This is the kit for the home mechanic who values not running out. The generous 300ml of fluid and longer warranty make it the most practical buy for ongoing maintenance.
Runner-Up: YOUMAYSTORY 120ml Kit
- ăCompatible with Shimano Hydraulic BrakesăThis specialized brake bleed...
- ăComplete Brake Bleeder Kit for Hassle - Free MaintenanceăOur brake...
- ăHigh - Quality Brake Fluid for Peak PerformanceăThe mineral oil...
Choose this if you have a single bleed job to do and want a lightweight, basic kit. It’s a solid, competitively priced option for a one-time fix.
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