ARRMA Big Rock 4X4 3S BLX (1/10 monster truck, ARA4312V3) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/arrma-big-rock-4x4-3s-blx/  (sheet CC BY 4.0)
Basis: Secondary source: ARRMA (Horizon Hobby), Big Squid RC (copy of the maker's figures; the maker publishes none directly)
Catalog version: 2026-10-20

Overall (mm): length 514, width 328, height 201
- The Big Rock is ARRMA's 1/10 3S crew-cab monster truck. The file is a 514 × 328 × 201 mm envelope; the length comes from Big Squid RC's spec list because the ARRMA page lists 327 mm, which is the wheelbase.
- Wheel hex and track are not published on these pages.
- True size, no printing tolerance added. Only published numbers are used; anything not published is said so.
- Secondary source: the numbers come from a retailer or magazine copy of the maker's specification.

dimension  value
Length  514 mm (review spec list; the ARRMA page repeats the wheelbase value here)
Width  12.91 in (328 mm)
Height  201 mm
Wheelbase  12.87 in (327 mm)
Ground clearance  55 mm (review spec list)
Weight  6.25 lb (2.84 kg)
Outer diameter (tire)  5.12 in (130 mm)
Battery tray (blocks fitted)  140 × 51 × 48 mm
Max battery (blocks removed)  165 × 51 × 48 mm
Motor  BLX3660 3200 Kv
Servo  ADS-7M

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- ARRMA (Horizon Hobby): ARRMA 1/10 Big Rock 3S 4X4 RTR — web — Publisher's page; dimensions are facts — https://www.arrma-rc.com/en/product/arrma-1-10-big-rock-3s-4x4-rtr-brushless-monster-truck-blue/ARA102723.html
- Big Squid RC: ARRMA Big Rock Crew Cab 1/10 monster truck — web — Publisher's page; dimensions are facts — https://www.bigsquidrc.com/arrma-big-rock-crew-cab-1-10-scale-monster-truck/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/arrma-big-rock-4x4-3s-blx/index.json
API: https://xemstudio.com/api/geometry?object=arrma-big-rock-4x4-3s-blx