Crank Buyback

Do Your Part for the Planet, Send Your Old Crank on a New Adventure

Mail in your old crank for cash, it benefits you and new riders alike by reducing waste and preserving resources required to manufacture new cranks. Every little bit counts!

How it Works

Send us your unused crank and we will clean it up, install a brand new PRECISION 3 Powermeter and resell it so someone else can experience the benefits of training with power.

In return, you will receive up to $45! Alternatively, you have the option to donate the money to one of our selected charitable organizations who are dedicated to helping underprivileged youth in local communities through cycling initiatives.

Make a difference and reCYCLE with us!

  • Receive up to $45 cash back or choose to have it donated to charity.

  • We provide you with a prepaid shipping label to send in the crank.

  • Tell us which left-side (non-drive side) crank you want to trade in.


  • What happens after I submit my application?

    Our team will review your application to confirm the crank model, and the condition of the crank, and then provide you with a prepaid shipping label and further instructions on how to send your crank to 4iiii.

  • What do you do with the used cranks?

    We will clean it up, put it through rigorous testing to make sure that it is structurally sound, and install a 4iiii power meter on it to sell as a refurbished power meter. All of our refurbished (clearance) power meters are installed on structurally intact cranks (they might have some cosmetic blemishes from normal riding wear and tear) and are fully tested to ensure they meet our high +/- 1% accuracy tolerances.

  • Can I send back more than one crank?

    Yes! When selecting your crank, click “add” for each one you’d like to include in your buyback submission. You can modify the number of each individual crank by clicking the plus or minus buttons.

  • I'm outside the US and Canada - can I participate?

    We haven’t yet set up the logistics to economically and sustainably receive cranks from outside North America, so subscribe to our newsletter for updates as we expand the crank buyback program to more areas.

  • How do I receive my rebate?

    You will receive an email notifying you that you have a PayPal payment in the amount of your rebate. If you have a PayPal account, log in to your account and click Activity at the top of the page to view the details of your payment. If you don’t have a PayPal account, you can quickly sign up for one and confirm your address to receive the payment.

    Rebates will be processed within 10-20 business days after a crank has been received by 4iiii.

  • What types of cranks are you accepting?

    We’re accepting non-drive side (left-side) cranks that are in good, working condition and may have minor scratches and scuffs. There is a complete list of crank models we’re accepting in the dropdown feature in Step 1 of the submission process.

  • Why don’t I see my crank on the crank eligibility list?

    If the crank you have is not one that is listed in the program, we unfortunately cannot use it to install a power meter on. The most common reason why a crank might not be eligible is if it has a concave channel on the inside of the crank arm. Installation involves more than just placement of the unit. Crank arms need to be tested for a number of variables to determine if it meets our engineering requirements. Hence we do not install on crank arms not on the approved list.

  • What is required to be sent with the crank?

    We require the crank along with the Shimano pinch bolts and safety plate to be included in order to qualify for the rebate. The safety plate is the black plastic piece that’s designed to ensure the pinch bolts are tightened properly.

  • Will I be provided with a prepaid shipping label?

    Yes, after you have submitted your application and our team has reviewed and approved the application, you will be emailed a prepaid FedEx or Canada Post shipping label and further packaging and shipping instructions.

  • Will I be provided with packaging?

    No. We will provide maximum packaging dimensions you can use and further shipping instructions. We recommend using an 8½“ x 12” padded shipping envelope.

  • What is The League of American Bicyclists?

    The League of American Bicyclists believes bicycling should be commonplace — an everyday part of life. To do that, they’re making biking an easier option for more people, because when more people bike, more people benefit, even those who don’t bike.

  • What is Two Wheel View?

    Two Wheel View is a Canadian charity that provides bikes, essential bike maintenance skills, and bike-focused development programs to underprivileged youth. You can learn more about Two Wheel View at

  • Will I receive a tax receipt for my donation?

    Yes! The charity will send you a tax receipt towards the end of the calendar year.

Apply Now!

Step 1: Select your left-side crank

Step 2: Select your rebate option

Send my rebate to me via PayPal.

Please allow 10-20 days for inspection and processing.

Two Wheel View helps get bikes into the hands of young kids that otherwise may not have the opportunity to get started in cycling. If you pick this, 4iiii will donate your rebate directly to Two Wheel View.

Learn more at

Step 3: Tell Us About You

Update for US Customers — Reese’s Law

Kies uw Regio: