Knuckle.

Knuckle at RC Shopper: 27 items in stock in the UK. Prices run from £5.99 to £129.99. Stock comes from Reve D, Rhino Racing, Overdose and 1 other brand. There are parts here for RDX, but check the listing for the revision you run. Stock levels on this page are real. Order before 2pm Monday to Friday and it is packed and posted that afternoon. Steering geometry sets turn-in. Change one thing — knuckle, rack position or Ackermann — and drive it before changing another.