Shimano Adapter SM-MA90-F203P Disc Brake
A reliable mounting adapter for upgrading to a 203mm disc brake rotor.
What Is It?
The Shimano SM-MA90-F203P/PM disc brake adapter is designed to allow a compatible post-mount brake setup intended for a 180mm rotor to accommodate a larger 203mm rotor. It positions the brake caliper correctly relative to the rotor, supporting safe installation and reliable braking performance when used with compatible components.
Key Features
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203mm rotor compatibility: Allows a compatible 203mm rotor to be fitted to a 180mm post-mount setup.
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Post-mount design: Intended for compatible post-mount brake calipers and frame or fork mounts.
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Shimano engineering: Designed for secure brake caliper positioning.
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Mounting hardware: Use the specified bolts and spacers for the relevant adapter version.
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Durable construction: Built for reliable use in compatible disc brake systems.
Specifications
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Specification
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Details
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Brand
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Shimano
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Model family
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SM-MA90-F203P/PM
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Product type
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Disc brake mount adapter
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Rotor size
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203mm
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Original mount size
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180mm
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Mounting style
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Post mount
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Application
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Compatible front fork or frame brake mount
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Installation tools
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Suitable 4mm or 5mm hex key, depending on setup
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Tightening torque
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6–8 N·m, as specified in Shimano's installation instructions
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Benefits
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Makes it possible to use a larger rotor for increased braking leverage.
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Helps ensure correct caliper alignment with the 203mm rotor.
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Provides a purpose-designed solution for compatible Shimano brake setups.
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Supports dependable braking when correctly installed.
Best Suited For
Mountain bikers upgrading from a 180mm to a 203mm disc rotor who need a compatible Shimano post-mount adapter.
