{"product_id":"tamiya-42391-1-10-trf421x-chassis-kit","title":"Tamiya 42391 1:10 TRF421X Chassis Kit","description":"This is a Tamiya 42391 1:10 TRF421X Chassis Kit. Key Upgrades \u0026amp; Features: Aluminum Lower Deck (2.0mm) \u0026amp; Motor Mount: Lowers the motor by 1.04mm for an optimized center of gravity, balance, and chassis flex.\u003cbr\u003eUpdated Upper Decks: Redesigned 1-piece and 2-piece options for improved flex. The 1-piece deck utilizes shims (0-0.3mm), tubes, and titanium screws for precise tuning.\u003cbr\u003eCarbon-Reinforced Suspension: Upgraded arms and new damper stays (moved 1.0mm inward) ensure stability on hot or high-grip surfaces.\u003cbr\u003eOptimized Drivetrain: Bearing-equipped front double cardan and rear universal shafts eliminate friction; direct spool cups and rear diff are upgraded to steel.\u003cbr\u003eAdjustable Geometry: Narrower upper arm mounts (1mm) improve cornering response. New knuckle arms offer tuned Ackerman positioning and optimized rear grip options.\u003cbr\u003eIncluded Tuning Extras: Comes with 1.2mm and 1.3mm stabilizers, a 30g battery weight, and a 20g receiver weight (which doubles as a cooling fan mount).\u003cbr\u003e*Note: The majority of these upgraded components are fully compatible with the standard TRF421 chassis.*\u003cbr\u003eRequired to Complete:\u003cbr\u003e2-channel radio, low-profile steering servo, ESC, 540 motor, wheels and tires, 190mm TC\/Sports Car body, 7.4V battery pack, and compatible charger.\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eCondition:\u003c\/strong\u003e Factory New\u003cbr\u003e\u003cstrong\u003eOperational Status:\u003c\/strong\u003e \u003ca href=\"#\" title=\"This item is brand new from the factory.\"\u003eFunctional\u003c\/a\u003e\u003cbr\u003e\u003cstrong\u003eOriginal Box:\u003c\/strong\u003e Yes\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Tamiya\u003cbr\u003e\u003cstrong\u003eModel Number:\u003c\/strong\u003e 42391\u003cbr\u003e\u003cstrong\u003eMSRP:\u003c\/strong\u003e $1274.00\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eCategory 1:\u003c\/strong\u003e 1:10 - RC\u003cbr\u003e\u003cstrong\u003eCategory 2:\u003c\/strong\u003e Chassis \u0026amp; Frame\u003cbr\u003e\u003cbr\u003e\u003cbr\u003eThe Trainz SKU for this item is P12848342. \u003cbr\u003e\u003cbr\u003e\u003cspan style=\"font-size: 6px !important; color: #d3d3d3 !important; line-height: 8px !important;\"\u003eTrainz Product Id: 12848342\u003c\/span\u003e","brand":"Tamiya","offers":[{"title":"Default Title","offer_id":44213346173050,"sku":"P12848342","price":946.43,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1260\/4747\/files\/P12848342-1428FD23.jpg?v=1790627889","url":"https:\/\/www.trainz.com\/products\/tamiya-42391-1-10-trf421x-chassis-kit","provider":"Trainz","version":"1.0","type":"link"}