Robert Downey Jr.‘s lookin’ ready to hit the BMX circuit … decked out in the proper attire for an afternoon bike ride — and doing some father-son bonding complete with a loving fist bump.

The actor — fresh off his first Oscar win — rode down the Malibu coast Tuesday with his 30-year-old son Indio, and we gotta say … RDJ made a loud statement with his athletic-chic fashion, one passing motorists were sure to see.

Check out the pics, Downey’s going with highlighter bright colors … a must-have while riding a bike on the mean L.A. streets, so drivers don’t accidentally plow down an acting icon. He’s also got his bike helmet on — safety first, kids!

We’re not gonna lie, Robert doesn’t look totally comfortable in some of the pics from the seat … but, he certainly seems to be enjoying himself when he gets a quiet second with his son — smashing fist to fist in a sweet moment.

BTW … seems like Indio doesn’t share his father’s style sense — opting for a more toned-down black sweater. But, he’s got his helmet on too, so it seems like Papa Downey might’ve won that argument.

Just to break down the family dynamic real quick … Indio is Robert’s son with his ex-wife Deborah Falconer whom he was married to from 1992 to 2004. He married his current wife, Susan, the following year, and they share two children: daughter Avri and son Exton.

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Anyhoo … seems like Robert’s enjoying much-needed R&R after securing his first Oscar W — taking home Best Supporting Actor for his role in “Oppenheimer” earlier this month.

Hey, maybe Rob’s researching for an “E.T.” reboot … time to take off, RDJ!!!