Click or scroll to zoom Tap or pinch to zoom ULTIMATE Ultimate BOOST 40K Custom - Short Axle by ULTIMATE €39.99 SKU 18935 1 2 3 4 5 6 7 8 9 10+ Quantity Quantity Add to cart CNC machined pinion steel gear. High-grade silver plated wiring and larger carbon brushes. Enlarged motor-shaft ball-bearing stabilizers. Heat resistant magnets (Neodym). Precision built motor housing. Silicon steel rotor. CNC machined stainless steel shaft. View our entire range of ULTIMATE parts here.