RimRock Effects is a boutique guitar pedal builder specializing in hand-assembled overdrives in the style of the Klon Centaur. The operation is run by a single builder who assembles each unit to order, having transitioned from kit building to fully custom designs after years of playing acoustic and electric guitar.

The brand's core catalog centers on two pedals: the Mythical Overdrive, a Klon-inspired transparent overdrive offering a toggle between 1N34 germanium and OA126 clipping diodes for different gain and breakup characteristics, and the Lil' Mo, which packages the same circuit and audio-grade components into a smaller enclosure. Builds are made in small batches with a short lead time, and the pedals have developed a following among players hunting for Klon tones without the secondary-market prices of originals.

RimRock pedals are sold directly through the company's website and on Reverb, and have been stocked by retailers including The Music Emporium, Eastside Music Supply, and Guitar Center. The brand has been covered in YouTube shootouts comparing it to the Klon Centaur, KTR, and other well-known clones, and it appears frequently in pedal forum discussions on The Gear Page and My Les Paul Forum.

RimRock has 2 products cataloged on Equipboard, including Overdrive Effects Pedals. Their gear is featured by 5 artists, with the strongest followings in Rock and Pop. Notable users include Matthew Healy, Adam Slack, and Hunter Thompson.