Corally RDX Phi Kit UK Spec has the lowest COG on the market. Narrowest chassis on the market. Equal length left and right rear bulkheads. Easy accessible diffs. Optimized weight distribution with equal weight on all 4 wheels. Easy adjustment and replacement of roll centre couplers, Improved steering geometry. Lower overall weight. Improved diff, spool and 1-way pulleys. Replaceable centre pulleys are used on the duraluminium spur gear adapter. All pulleys are optionally available in several sizes for optimised internal ratio on long and short tracks with either brushed or brushless motors. Adjustable wheelbase settings: standard 264 mm RDX wheelbase or short 256 mm wheelbase without sacrificing the driveshaft alignment. Fine wheelbase tuning by hingepin spacers. New wishbone design. Pre-shaped battery slots. Improved swaybar mounting system. Hard anodized duraluminium pivot balls. And most importantly… all parts and suspension are optimised by phi ‘golden ratio’ geometries throughout the design.