Heavy Hitter Zero XB 420 Primary Chain Drive Conversion Kit

Last updated Sept 9th, 2025

GritShift strives to provide customer satisfaction in everything we do. If you are not satisfied with a product or service you have received, please do not hesitate to let us know, and we will do everything possible to accommodate your needs.

ORDER CANCELATIONS

Orders may be canceled anytime prior to shipment. All orders canceled prior to shipment are not subject to restocking fees. Once the item(s) have been shipped, you will be required to follow the standard returns process

RETURNS

Parts Returns: A return must be made within thirty (30) days of the purchase date. In order to qualify, the product must be in new, unused/uninstalled condition. All original packaging and tags must be intact and included. Returns with ordinary wear and tear or damage caused by improper use or accidents will not be accepted.

E-Bike Returns: Returns on any vehicles will not be accepted once the vehicle has shipped. Order cancellations are accepted if the vehicle has not shipped.

EXCEPTIONS    

The following items cannot be returned or exchanged once shipped: 

1. ECU Tunes and other services

2. E-Bikes or Complete New Vehicles

3. E-Bike Controllers, Motors, or Batteries

RETURN PROCESS

To return an item, please email customer service at support@gritshift.com to obtain a Return Merchandise Authorization (RMA) number. For customers in the U.S.A., GritShift can provide a pre-paid shipping label, which will be at your expense. This will include the RMA number on the shipping label.

Providing a pre-paid label is a great way to extend cost savings to you with our discounted rates applied. The fee for shipping will be based on the weight and size of the item(s). This fee will be deducted from your total refund amount.

INTERNATIONAL RETURNS

International shipments should be marked as a "Merchandise Return" with a carrier that does not levy brokerage fees. You are responsible for the cost of shipping the item back to us. We suggest using a carrier that provides a tracking number and a signature. The customer is responsible for any applicable brokerage or customs fees.

All shipments must be prepaid; packages shipped COD will be rejected.

REFUNDS

After receiving your return and inspecting the condition of your item, we will process your return or exchange. Please allow at least fifteen (15) business days from the receipt of your item to process your return or exchange. Refunds may take 5-10 business days to appear in your account, depending on your credit card company. All refunds will be made to your original payment method. We will notify you by email when your return has been processed.

PLEASE NOTE

• A 15% restocking fee WILL be charged for returns    

DAMAGED ITEMS

Please let us know ASAP if any items on your order arrive damaged. Please keep all original shipping containers and take pictures if possible. Damaged item claims are handled through the shipping carrier (UPS, FedEx, USPS, DHL). We will assist our customers with these claims. We only ask that customers be patient, as sometimes this process can take longer than any of us would like!

WARRANTY

Each manufacturer has its own warranty policy. GritShift will assist customers with their warranty; however, GritShift does not provide any direct warranty on items sold.

WARRANTY RETURNS

Most manufacturers offer an additional warranty period that covers merchandise defects. To determine warranty requirements for a specific item, please contact us for assistance.

Please note warranty processing may take 4-8 weeks and will be subject to the individual manufacturer's policies and discretion. Manufacturer warranties do not cover defects determined to be caused by normal wear or due to customer negligence. 

QUESTIONS

If you have any questions concerning our return policy, please contact us at: 

support@gritshift.com 

800-883-1594