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Prices may varyThis product ranks #9 of 15 in Brake Rotors.Three above it ↓
Last reviewed July 11, 2026
TL;DR Silver zinc plated vented front rotor pair, 293mm, for the 2008-2014 WRX's base brake package. No disclosed iron grade or OE-supplier provenance, an unremarkable aftermarket rotor rather than a standout.
The R-31407x2-AC is a vented, silver zinc plated cast-iron front rotor pair sized at 293mm, built for the base WRX brake package. Detroit Axle publishes no iron grade or runout tolerance and is not an OE brake supplier to any automaker, so metallurgy and machining precision stay unconfirmed. The vented design suits daily driving and matches the OE package. Owner sentiment on the brand's rotor line overall is mixed: some report clean, pulsation-free installs, others caution that aftermarket rotors can warp in cold climates. No factory balancing figure is published.
Right pick for a base WRX owner wanting an affordable rotor without OE-supplier provenance. Skip for a WRX STI, which uses a larger Brembo rotor. Skip too if you need a documented iron grade or runout tolerance, neither is disclosed here.
No chemical exposure pathway, an inert cast-iron part with no SDS. Brake service stirs up dust: wear a dust mask and never blow it out with compressed air, that belongs to the brake system, not this rotor. It recycles as ferrous scrap through most parts stores.
It's built for the base WRX brake package, which uses a 293mm front rotor across this generation. The WRX STI runs a physically larger Brembo rotor and is a different part entirely. Confirm your exact trim and year before ordering, since the manufacturer lists the 2008-2011 and 2012-2014 WRX years as separate application lines.
No. Detroit Axle describes itself as an aftermarket cross-reference parts manufacturer, not an OE supplier to any automaker. This rotor is built to bolt on and match the OE spec, not sourced from Subaru's own supplier chain.
Detroit Axle discloses a silver zinc plating on the non-friction surfaces. It's a standard single-layer coating class, not a premium multi-layer or geomet coating. No part-number-specific rust complaints turned up in available owner sentiment.
No. This is the front rotor pair only. Pads, hardware, and a rear rotor are separate purchases.
Vented. The manufacturer lists a vented vane design matching the standard WRX front brake package, which uses a vented rotor.
The Amazon listing for Detroit Axle R-31407 Front Vented Brake Rotor Pair carries a California Prop 65 warning. California requires this warning on a very wide range of manufactured goods — including rubber, vinyl, plastic, and metal automotive parts — whenever trace exposure to any of roughly 900 listed substances (commonly phthalates or heavy metals) is possible, regardless of whether the specific product poses a meaningful health risk. As a passive accessory, Detroit Axle R-31407 Front Vented Brake Rotor Pair has no Safety Data Sheet, so there's no chemistry breakdown to translate beyond that.
Marketing copy from Detroit Axle, via Amazon. Not editorial.
Per manufacturer cross-reference. Verify on Amazon before purchase.
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