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Kit shock setup (Low grip asphalt). Part numbers link to AMain.
Out of the box the Medius X20 '21 runs 400 cst front, 400 cst rear (Serpent oil), on 4 hole (#401841) front, 4 hole (#401841) rear pistons. That is the kit setup; you will need to adjust it for your track conditions. The RC Setup App can help dial it in.
The kit springs are Yellow 2.6 (#401853) front, Yellow 2.6 (#401853) rear. Stiffer springs suit high grip and big jumps; softer springs add grip on slick or bumpy tracks.
The kit diff fluid is 7,000 cst rear. Thicker front adds steering on power; thicker center sends more drive rearward; thicker rear stabilizes the car under throttle.
Free to start · iOS & Android
Your Serpent Medius X20 '21 is in the RC Setup App
Save every setup change you make to your Serpent Medius X20 '21, get AI tuning answers for that exact car, and log your races — at the track or back in the pits.

