AndyMark EVO Shifter 4 RedLine (4in. Wheel Version)
Optimizes performance with 4-inch wheels
Features 2-speed, shift-on-the-fly gearbox
Enhances reliability with improved dog shifting
Accommodates up to four 775 motors
Includes aggressive weight reduction
The AndyMark EVO Shifter 4 RedLine (4in. Wheel Version) represents the latest advancement in shifting transmission gearboxes for competitive robotics. This two-speed, shift-on-the-fly gearbox is designed to accommodate up to four 775 class motors, such as the AndyMark RedLine Motor. It features an enhanced 4-tooth dog shifting mechanism, which provides increased strength and reliability over previous models. The gearbox is optimized specifically for driving 4-inch diameter wheels, ensuring efficient performance in competitive environments.
This version of the EVO Shifter is equipped with a pneumatic shift method, utilizing a spring-extended PHD pneumatic cylinder. This allows for seamless shifting even while the robot is accelerating, pushing, or decelerating. The gearbox is shipped assembled, though the motors are not pre-installed. Notably, the gearbox includes a 2 Stage EVO Shifter Long Hex Output Shaft, which is integral to its operation.
Significant improvements have been made in this model, including the use of AMPCO® 18 Bronze for the dog gear, which offers enhanced lubricity for smoother shifting. The shift block assembly has been reinforced with a larger bearing and steel housing, and the input stage now uses 32DP gears for an effective first stage reduction. Additionally, the gearbox features aggressive weight reduction and improved encoder options, making it a versatile choice for various robotic applications.
Note: It is crucial to use this gearbox configuration only with 4-inch wheels to prevent potential damage to the motors. For larger wheels, an external reduction device is recommended.
1x US Digital encoder
1x Pneumatic cylinder
Two-speed, shift-on-the-fly gearbox
Enhanced 4-tooth dog shifting method
Compatible with up to four 775 class motors
No servo shifting available
Optimized for 4" diameter wheels
Ratio A: 13.58:1 - 19.50 ft/s on 4" wheels
Ratio B: 28.33:1 - 9.35 ft/s on 4" wheels
Two-stage EVO Shifter with long hex output shaft
Eleven significant improvements over previous designs
Pneumatic shift method with spring-extended PHD pneumatic cylinder
If you are not satisfied with a product purchased from the Site, you may request a return within 30 days from the delivery date, unless the product is listed under the Return Exceptions below or is subject to specific return conditions noted on the product page.
This return policy also applies, as a minimum standard, to products sold and fulfilled by third-party vendors through the Marketplace.
Returns under this policy concern non-defective products. In the case of a confirmed manufacturing defect, remedies are handled under the Warranty terms, at the Vendor's discretion. See the Warranty section.
Return Conditions
To qualify for a refund under the 30-day return policy, all of the following conditions must be met:
A valid Return Authorization (RA) number must be obtained prior to returning the product. Returns without an RA number will be refused.
The RA number is valid for 30 days. The returned item must be received within that period.
The RA number must be included with the return.
Products must be returned in unused, unmodified condition (e.g., no scratches, alterations, missing parts, or signs of installation/use) and in their original packaging, suitable for resale.
Shipping fees are non-refundable. Return shipping costs are the responsibility of the customer, except in cases of a product confirmed defective through RobotShop's troubleshooting process or of a verified shipping error by RobotShop.
Refunds are processed within 7 days after receipt and inspection of the returned item.
A $100 cleaning fee may apply to domestic robots returned in used or unclean condition.
A 20% restocking fee may apply to large-quantity returns of items ordered specifically for the customer from the manufacturer or not part of RobotShop's standard inventory.
Return Exceptions
The following products are not eligible for return or refund under this policy:
Used, damaged, or modified products — Items that show signs of use, wear, or alteration, making them unsuitable for resale.
Consumables — Use and wear-and-tear components, altered or depleted through use (e.g., batteries, belts, brushes, gears, filament, tires, disposable bags, lubricants, greases, waxes, etc.). Not eligible for return once opened or used.
Perishables — Goods liable to deteriorate or expire rapidly. Not eligible for return.
Sealed goods (health or hygiene) — Items sealed for health-protection or hygiene reasons (e.g., masks, gloves, odor-absorbing products). Not eligible for return once unsealed.
Build-it-yourself products and items requiring customer assembly — Including robots & kits, robot parts, and other products requiring assembly or soldering. Not eligible for return once assembled, soldered, or installed.
Digital Goods, Software, and Apps — Final sale only, due to licensing restrictions.
Clearance Items — Products identified as clearance or final sale, including end-of-life or discontinued items.
Custom-made, personalized, or special-order items — Products manufactured, configured, adapted, or built to the customer's own specifications and requirements.
On-Demand Items — Standard catalogue products not stocked by RobotShop and ordered specifically to fulfill a customer request.
While the same return policy applies, these orders require a separate contact process for returns.
RobotShop Fulfilled Orders → submit a support ticket from your account under My Support Tickets.
Marketplace Vendor Orders → submit a ticket from your account under My Marketplace Tickets to contact the vendor directly.
Note: Marketplace vendor products are normally labelled with SKUs starting with RM, and identified on the product page with the mention "Sold and fulfilled by [Vendor Name]".
