TRUCK WHEELS & TIRES. 1/12 RC Car Bodies. CAR WHEELS & TIRES. CAR WHEELS TIRES RIMS. GPM For Traxxas X-Maxx METAL UPGRADE SET. Arms, Knuckles, Hubs #txm100. FULL METAL UPGRADE KIT. INCLUDES ARMS, HUBS, KNUCKLES FRONT + REAR. Original Name / Part No. 7729+7730+7732+7737+7752 Part location: Upper & lower arms (F+R), c hubs, knuckle arms (F+R) Product major functions & usage: 1. Support and stabilize front and rear chassis, improve steering performance. The smooth swing of the upper and lower arms helps the vehicle to perform in best shape. Accessories: Upper Arm 4pcs Lower Arm 4pcs Front Knuckle Arm 6pcs Fromt C Hub 2pcs Rear Knuckle Arm 2pcs 4×48.5 Steel Pin 4pcs 4×85 Steel Pin 4pcs 3x7x2 Shim 16pcs 4×25 Round Head Screw 4pcs 3×8 Flat Head Screw 16pcs 4×37 Stainless Steel Button Head Screw 2pcs 3×8 Round Head Screw 4pcs 4×45 Steel Pin 4pcs 4×43 Steel Pin 4pcs Stainless Steel Large Head Screw 16pcs How: Adjust the tie rods of front and rear upper arms. Purpose: Adjust the length of front and rear upper arms. Major advantages of upgrading to this part/product: 1. Made with a quality light weight high tensile strength aluminum 6061 T6 for greater durability and more stable to use. The middle part of upper arm has upgraded to #45 steel to so the arms are stronger and prevent collapse but keep a light weight at the same time. Knuckle arms and c hub are inserted with POM collar so the axle rotation and the upper and lower arms swing more smoothly. Upper arms used a tie rod design with counter-clockwise threads in order to adjust the length to suit different road condition. Subscribe to our newsletter.