Shimano SM-MA90-R160P/S bike brake adapter with mounting bolts, black finish
Shimano SM-MA90-R160P/S bike brake adapter with mounting bolts, black finish
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Shimano Brake Adaptor (4mm Hex) SM-MA90-R160P/S Rear IS to Post Mount 160mm

S$25
S$25
.
Low stock, less than 5 left
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What's in the box
Description
Description
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Shimano SM-MA90-R160P/S gives your IS-mount frame a modern post mount brake setup, with no fuss and no compromise on stopping power.

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.

Why You'll Like It

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.

Key Features

  • Converts rear IS2000 (51mm) frame tabs to 74mm post mount interface for 160mm rotor use
  • Lightweight aluminum alloy construction with machined center window to reduce weight
  • Compatible with all Shimano 74mm post mount brake calipers, including SLX, XT, and XTR
  • Includes mounting hardware and a locking wire to secure the bolt after installation
  • Rear-specific geometry, correctly positions the caliper for a 160mm rotor at the back wheel
Returns & Refunds
Returns & Refunds
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At a glance

  • Returns accepted within 30 days of purchase
  • Items must be unused, in original packaging, with a receipt or proof of purchase
  • Apparel and shoes can't be returned once shipped
  • Sale items can't be refunded
  • Return shipping is paid by the customer and is non-refundable

Returns

Our returns policy lasts 30 days. If more than 30 days have passed since your purchase, we're unable to offer a refund or exchange. Apparel and shoes are not eligible for return once they have been shipped out.

We accept returns if the item is eligible for a warranty claim or if the wrong item was shipped to you. To be eligible, your item must be unused, in the same condition you received it, and in its original packaging. A receipt or proof of purchase is required.

Please do not send your purchase back to the manufacturer. Once your return is received and inspected, we'll email you to confirm.

Sale items

Only regular-priced items can be refunded. Sale items cannot be refunded.

Exchanges

We replace items only if they are defective or damaged. To exchange an item for the same one, email us at info@reevolution.sg and send the item to 16 Morse Road, #01-209, Singapore 099228.

How to return an item

  1. Email us at info@reevolution.sg with your order details.
  2. Bring or mail the item to 16 Morse Road, #01-209, Singapore 099228.
  3. We'll inspect your item and email you once it's received.

You are responsible for the cost of return shipping, and shipping costs are non-refundable. If you receive a refund, the cost of return shipping will be deducted from it. For valuable items, we recommend a trackable shipping service or shipping insurance, as we can't be responsible for returns we don't receive.

Refunds

Once your return is received, inspected and approved, your refund will be processed to your credit card or original method of payment. A refund will also be issued if an item turns out to be out of stock after your order is placed. How long it takes to appear depends on your bank or card provider.

Late or missing refunds

If you haven't received your refund yet:

  1. Check your bank account again.
  2. Contact your credit card company, as it may take some time before the refund is officially posted.
  3. Contact your bank. There is often some processing time before a refund is posted.

If you've done all of this and still haven't received your refund, please get in touch.

Contact us

Shipping & Return
Shipping & Return
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Free standard delivery on orders SGD 80 and above within Singapore.

Delivery within Singapore

Delivery optionOrders below SGD 80SGD 80 and aboveDelivery time
In-store pickupFreeFreeCollect in store
Standard deliverySGD 5Free4–7 working days
Express deliverySGD 20SGD 20Next working day

In-store pickup

Collect your order from our store at 16 Morse Road, #01-209, Singapore 099228.
Monday to Friday: 11.30am – 7pm
Saturday: 11.30am – 6pm

Overseas shipping

We ship overseas on request. Contact us with your address and the items you'd like, and we'll send you a shipping quote.

Request a shipping quote

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