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Key Specs
About this product
The CR3.4eco crawler in Sherpa style is interesting for all those who are looking for purist crawling or want to get into this fascinating hobby on a low budget.
This vehicle is a “downgrade” of our original “CR3.4 RTR chassis which is probably one of the best on the market and has been since 2020!
The quality of the installed parts is of course the same as its fully equipped brothers. The mounting points for special equipment such as the differential locks or 2-speed gearbox would theoretically also be available.
The vehicle comes as standard with a 550 32T brushed high torque motor and a HobbyWing 40A speed controller. You can use “jumpers” on the speed control to determine whether the vehicle will be powered by a 7.2V NiMH battery or a 2S or 3S (low profile) LiPo battery!.
Portal axles not only offer a greater distance from the differential housing to the ground than conventional axles, they also have another positive feature. With conventional crawlers, the torque applies so much force that the vehicle jumps over the obstacle. The design of the portal axles reduces the gear ratio at the wheels and virtually eliminates torque shocks from the drive. The overall reduction ratio of the final drive is more than double that of non-portal versions to ensure smooth running
The steering shock absorber absorbs most hard impacts so that the 9kg MG steering servo and the servo arm are spared. Hardened steel drive shafts and a steering angle of 45.8° offer the best possibilities for every terrain. Added to this are the 2.2″ tyres, which not only look stylish, but also offer extremely good Grip thanks to the super-soft tyres.
Our 4-channel, 2.4 GHz CR4S-V2 radio control system completes the package.
2.4GHz 4-channel remote control CR4S-V2
9kg steering servo with metal gears
40A Hobbywing speed controller (3S LiPo capable) with T-connector
32T 550 brushed motor
Portal axles
Aluminium 4-link suspension
Steel drive shafts front and rear
Heavy duty cardan shafts front and rear
Steering angle max: 45.8°
Rims: 2.2″ with 12mm hexagon mount
Tyres: Supersoft 40x115mm
Shock absorber length: 90mm
Viscosity of damper oil: 500cps
Gearbox: Module 0.8/32dp; pinion18T / main gear44T
Approach angle: 60°
Departure angle: 45°
Length: 542mm
Width: 250mm
Height: 240mm
Ground clearance: 53mm
Wheelbase: 313mm
Weight: 2390g
CR3.4eco crawler including remote control
operating instructions
Sticker sheet
7.2V NiMH battery, 2S/7.4V LiPo battery or 3S/11.1V LiPo battery .
Charger suitable for the battery type.
4 AA Mignon batteries or TX LiPo battery for the remote control.
You can find a selection of suitable parts on this page under “Spare parts and accessories”
Frequently Asked Questions
The CR3.4eco is designed for both newcomers and experienced crawling enthusiasts. It comes fully assembled and ready to run (RTR), so no building is required, making it accessible for beginners. The portal axle design also provides smooth power delivery with minimal torque shock, which makes it forgiving for less experienced drivers.
The CR3.4eco is compatible with 7.2V NiMH batteries or 2S/3S LiPo batteries (low profile). You can switch between battery types using jumpers on the HobbyWing 40A speed controller. The product description does not specify whether batteries are included in the box, so you should confirm with the retailer before purchase.
The RTR package includes the assembled chassis, 2.4 GHz CR4S-V2 radio control system, 9kg metal-gear steering servo, 40A HobbyWing speed controller, 32T 550 brushed motor, and all hardware. Batteries are not mentioned as included, so they are likely sold separately.
This is a 1:10 scale crawler, which is a standard compact size suitable for most indoor and outdoor spaces. Exact dimensions are not provided in the product information, so check the manual or contact the retailer for specific measurements if space is a concern.
Portal axles sit higher above the ground than conventional axles and reduce the gear ratio at the wheels, which virtually eliminates torque shock and prevents the vehicle from jumping over obstacles. The overall final drive reduction ratio is more than double that of non-portal versions, resulting in smooth, controlled crawling performance ideal for technical terrain.
