Description
- AndyMark EVO Shifter Short Hex Shaft, StageA 3 – 21.72:1 Ratio 2:1, StageB 3 – 15.11:1 Ratio 2:1
- Advances with shift-on-the-fly gearbox
- Allows motor inputs from two CIM or NEO
- Includes AMPCO 18 Bronze dog gear
- Features versatile mounting options
- Employs pneumatic shift method
The AndyMark EVO Shifter Short Hex Shaft, StageA 3 – 21.72:1 Ratio 2:1, StageB 3 – 15.11:1 Ratio 2:1 represents a significant advancement in shifting transmission gearboxes. This two-speed, shift-on-the-fly gearbox is designed with an improved 4-tooth dog shifting method, allowing for seamless transitions between speeds. It accommodates motor inputs from two CIM or NEO motors and can be configured with either two or three interior stages, offering flexibility in performance. The gearbox is shipped assembled, though motors are not installed.
Significant improvements have been made over previous models, including a robust 1/8″ diameter shoulder screw and a dog gear made from AMPCO 18 Bronze, which enhances strength and provides added lubricity for smoother shifting. The gearbox features a super-strong shift block assembly with a larger bearing and threaded steel housing, contributing to its durability. The input stage utilizes 32 DP gears and a 15-tooth pinion gear, achieving a high 85:15 first stage reduction. Users can independently select high and low ratios, allowing for tailored performance adjustments.
The EVO Shifter employs a pneumatic shift method, utilizing a spring-extend pneumatic cylinder for reliable operation even under varying conditions such as acceleration or deceleration. The gearbox is designed with aggressive weight reduction features and includes more encoder options, such as the US Digital E4T. It is compatible with an AM14U family chassis or a 2″x1″ box tube frame, providing versatile mounting options. The gearbox’s design ensures ease of assembly and disassembly without concern for gear orientation, thanks to the uniform features on the cluster gears.
Note: Ensure proper greasing and break-in procedures are followed for optimal performance and longevity of the gearbox.
View moreWhat’s Included
- 1x AndyMark EVO Shifter Short Hex Shaft, StageA 3 – 21.72:1 Ratio 2:1, StageB 3 – 15.11:1 Ratio 2:1
- Shielded, flanged ball bearings
- 1117 steel 32 DP gears, with 20-degree pressure angle (1st stage)
- 4140 steel 20 DP gears, with 14.5-degree pressure angle (2nd and 3rd stage)
- 1/4″ thick aluminum side plates, pocketed
- US Digital encoder and pneumatic cylinder included
- 4140 steel output shafts
- Individual hardware within two-stage assembly (excluding gears from ratio A and B)
- 1x Red Tacky Grease, 14.2 gram
- 1x Encoder Mount Pad
- 1x EVO Shifter Shift Block Assembly
- 1x E4T Encoder
Specifications
- Two-speed, shift-on-the-fly gearbox
- Improved four-tooth dog shifting method
- Motor input: two CIM or NEO motors
- Configurable with two or three interior stages
- Selection of various 1/2 inch output shafts
- Plates designed for mounting two motors
- Shipped assembled, without motors installed
- Dog gear with four dogs on each face for increased strength
- Robust 1/8″ diameter shoulder screw
- Dog gear material: AMPCO 18 Bronze
- Super-strong shift block assembly with larger bearing and threaded steel housing
- Input stage uses 32 DP gears and a 15-tooth pinion gear
- High 85:15 first stage reduction
- Independent high and low ratio selection
- More encoder options available
- Aggressive weight reduction features
- Cluster gears with features surrounding the bore on both sides
- Optional third stage provides additional C ratio choice of 1.14 or 2:1
- Pneumatic shift method with spring-extend pneumatic cylinder
- Extend Stroke (spring extend): 4 lbs
- Retract Stroke (air actuated at 40 PSI): 15.7 lbs
- Encoder Ratio: 3:1 on two-stage versions
Unconditional Satisfaction Guarantee
