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Got an older frame with IS2000 mounts and a modern post mount caliper that just won't play ball? The Shimano SM-MA90-R160P/S is the fix. It converts a rear IS2000 (51mm International Standard) frame tab into a clean 74mm post mount interface, correctly positioning a post mount caliper for a 160mm rear rotor. No hacks, no workarounds, just a proper Shimano solution.
Shimano machines the SM-MA90 from aluminum alloy, with material removed from the center to shave weight without giving up the stiffness needed for consistent, reliable brake feel. The result is a tidy, purpose-built adapter that looks like it belongs on the bike, not an afterthought. Mounting hardware is included, and a locking wire keeps the bolt secure once everything is torqued down.
This adapter is specific to rear applications with 160mm rotors, which is the go-to size for most cross-country and trail builds. It works with all Shimano 74mm post mount calipers, so whether you're running SLX, XT, or XTR, you're covered. Small part, big difference.
Tinkerers and build-it-yourself trail riders get a genuine Shimano solution that keeps older IS-mount frames in the game with modern hydraulic calipers. Your rear brake setup will be properly aligned, rattle-free, and dialed in for a 160mm rotor without any sketchy third-party adapters. Grab this, torque it down, and get back to riding.
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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