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If you're tired of swapping out headset bearings every time the season gets wet, the Enduro ACB 4545 150 Stainless Steel is the upgrade your front end deserves. This is a 1-1/2 angular-contact headset bearing built from 440C stainless steel balls and races, measuring 40mm x 51.8mm x 7mm with 45x45 degree contact angles. The slightly smaller 51.8mm OD is the key detail here: it's designed to fit the tighter lower bearing seats found in some framesets where a standard ACB 4545 150 won't quite seat correctly.
Not all stainless is created equal, and Enduro leans hard into that point. They spec 440C specifically because it carries the highest strength, hardness, and wear resistance of the entire 440-series family, achieved through special heat treatment and cryogenic treatment. Pair that with LLB-type seals, Almagard 3752 grease, and a bearing cavity that's 90% packed with high-pressure waterproof grease, and you've got a bearing that treats mud, creek crossings, and post-ride hose-downs as a non-event.
The angular-contact geometry does the heavy lifting on longevity. Every single ball engages evenly under load, spreading force across a larger surface area to minimize wear and maximize bearing life. At 24g and a static load rating of 977lbf / 4.34kN, this is a serious piece of kit that punches well above its weight class.
You'll feel the difference every time you rail a corner or muscle through a tech section, knowing your headset is running smooth and corrosion-free no matter how ugly the conditions get. If your frame has a tighter lower bearing seat that swallows standard bearings incorrectly, this bearing's 51.8mm OD is exactly what you've been hunting for. Enduro's 440C stainless construction means sweat, sports drink spills, and week-long rain rides are no longer a bearing's worst nightmare.
Our returns policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange. Apparels and shoes are not eligible for returns once they have been shipped out. We only accept returns if the item is eligible for a warranty claim or if the wrong item has been shipped to you. To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging. To complete your return, we require a receipt or proof of purchase. Please do not send your purchase back to the manufacturer. Once your return is received and inspected, we will send you an email to notify you that we have received your returned item.
Only regular priced items may be refunded, unfortunately sale items cannot be refunded.
We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at info@reevolution.sg and send your item to: 16 Morse Road, #209, Singapore, 01, 099228, Singapore.
To return your product, you should bring or mail your item to: 16 Morse Road, #209, Singapore 099228. You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund. Depending on where you live, the time it may take for your exchanged product to reach you, may vary. If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We will not be responsible if we do not receive your returned item.
Refunds will only be issued if the item is out of stock after the transaction is made. If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.
Our returns policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange. Apparels and shoes are not eligible for returns once they have been shipped out. We only accept returns if the item is eligible for a warranty claim or if the wrong item has been shipped to you. To be eligible for a return, your item must be unused and in the same condition that you received it. It must also be in the original packaging. To complete your return, we require a receipt or proof of purchase. Please do not send your purchase back to the manufacturer. Once your return is received and inspected, we will send you an email to notify you that we have received your returned item.
Only regular priced items may be refunded, unfortunately sale items cannot be refunded.
We only replace items if they are defective or damaged. If you need to exchange it for the same item, send us an email at info@reevolution.sg and send your item to: 16 Morse Road, #209, Singapore, 01, 099228, Singapore.
To return your product, you should bring or mail your item to: 16 Morse Road, #209, Singapore 099228. You will be responsible for paying for your own shipping costs for returning your item. Shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from your refund. Depending on where you live, the time it may take for your exchanged product to reach you, may vary. If you are shipping an item over $75, you should consider using a trackable shipping service or purchasing shipping insurance. We will not be responsible if we do not receive your returned item.
Refunds will only be issued if the item is out of stock after the transaction is made. If you are approved, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within a certain amount of days.
If you haven’t received a refund yet, first check your bank account again. Then contact your credit card company, it may take some time before your refund is officially posted. Next contact your bank. There is often some processing time before a refund is posted. If you’ve done all of this and you still have not received your refund yet, please contact us.
| Delivery Option | Below $80 | $80 and above | Delivery Time |
| In Store Pickup | Free | Free | - |
| Standard Delivery | $5 | Free | 4-7 working days |
| Express Delivery | $20 | $20 | Next Working Day |
We ship worldwide using DHL Global Express. Simply enter your shipping address at checkout and you will receive the shipping quote.
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