The AndyMark 4in. Performance Wheel w/ 0.5in. Hex Bore is a robust and durable wheel crafted from solid 6061 aluminum, renowned for its resilience in competitive robotics. This wheel has been a staple in the FIRST Robotics Competition, demonstrating its reliability and strength. The current version is designed to be cost-effective, utilizing a custom extrusion process rather than being fully machined from billet. It features a 1/8 inch thick boss on the rear side to minimize friction in bearing outer races, thereby reducing the component count in drivetrains.
This wheel is compatible with a 1/2 inch hex shaft and supports other motion hardware that employs a 1.875 inch 6-hole bolt circle, common in AndyMark and other competitive robotics products. The wheel does not come with tread material, allowing users to customize its performance according to specific needs. For mounting, a 250 Sprocket and Pulley Spacer is recommended for the rear side, while a 550 Sprocket Spacer is suggested for the front.
Note: The wheel is designed for tread attachment using rivets, with AndyMark recommending steel rivets of 1/8 inch diameter and a grip range of 0.251 to 0.312 inches. The rim is manufactured without pre-drilled holes, providing a customizable surface for teams to install rivets as needed.
If you are not satisfied for whatever reason with a Product you bought on the Site, it is possible to return it for refund within 30 days from the date you received it unless otherwise indicated in the Product listing. You must first advise the Vendor associated with your order in your account to obtain a return authorization (‘’RA’’) number before returning a Product. (‘’RA’’) numbers are valid for 30 days, within which time the returned Products should be received by the Vendor. No returns will be accepted without having previously obtained an (‘’RA’’) number. The Product must then be returned in its original packaging (in perfect condition for resale) with its receipt and your (‘’RA’’) number. Reimbursement will be denied for any Products which do not conform to the above mentioned conditions.
Build-it-yourself Robot Parts are not refundable once assembled. Robots & Kits requiring assembly or soldering are also not refundable once assembled, soldered or modified in any way. All sales of robotic software and apps are final and cannot be refunded or exchanged. Returns are not accepted on special orders and clearance items except when they are found defective, in which case the Product may be repaired or replaced at the Vendor’s discretion. 20% Restocking fees may apply if you are returning a large quantity of the same Product that was ordered specifically for you from the manufacturer.
Please note that all items will be reimbursed within 7 to 14 days of receiving the Product (shipping fees excluded). You must also cover the cost of returning the Product. Shipping fees will only be refunded if the return is a result of a shipping error on our part. Cleaning fees of USD 100 may also be charged if a domestic robot is returned and has not been properly cleaned.
