Pleasant Hill Grain


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Today we're shipping orders for in-stock items placed August 31. Despite higher order volume, our amazing shipping team continues to ship orders quickly. Recently we opened an additional shipping line that’s reducing processing time, and we've hired 15 new team members in the past 90 days! If you need to contact us, EMAIL is better than phone and if you have questions about your order please check our FAQ page before contacting us. Our phone volume is so high that it’s literally impossible for us to answer calls live now, or return calls quickly. The Hampton showroom is temporarily closed. We greatly appreciate your business as we do our very best to serve you!

Bicycle Sprocket Drive for Wonder Junior Mill

ClWonder Junior Deluxe mill bicycle sprocket drive.
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SKU: DP544, Shop more WonderMill items


Chain Sprocket fits on the shaft of your Wonder Junior Hand Grain Mill so you can hook it up to a bike. The chains of most modern bicycles will fit the sprocket, and mill speed must be no more than 300 RPM. User is solely responsible for safe design and operation of any drive system, including full shielding, which is essential for safety.

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Brand WonderMill
UPC Does not apply


We stock this product in our Nebraska warehouse. Most of our shipments are by FedEx Ground or Home Delivery and you should receive your order in four business days or less from ship-out. Click here for more information about shipping.


Overall Rating:
5 Reviews
5 Reviews
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  • Chain size not “most modern bikes”
    By on - Verified Buyer
    The product description says “The chains of most modern bicycles will fit the sprocket” which really isn’t all that helpful- maybe a bit misleading. I have many different “modern bicycles” none of the chains work with the provided sprocket. I have 1/2x 3/32 chain that all of my modern bicycles use sitting on a shelf that I planned on using- sprocket is too wide for use w/ 3/32 chain. Wish the description gave an accurate/precise chain size so that I could have been prepared. Correct chain size is 1/2x1/8 (or larger width). Seems like there maybe was a product change and maybe that’s why the product that was delivered is different from pictures. Other than that it works great
    9 out of 9 people found this review helpful.  Did you?
  • Great for Speeding things up.
    By on - Verified Buyer
    Pleasant Hill Grain, Wow fast delivery, This sprocket drive really speeds the milling. Glad they offer it. Heavy duty in nature and came with tool to help remove the handle, if needed.
    2 out of 2 people found this review helpful.  Did you?
  • Well built
    By on - Verified Buyer
    This is a very sturdy, well built unit. The packaging is extremely poor and it has an offensive odor, making storage in the original packaging impossible. That said, all the pieces/parts were included and all arrived intact.

    I tried this product using rice and the stone milling wheels. It was definitely labor intensive and quite a work out. It might have been that the stones were new and in the process of taking a set, as it did seem to get easier after about an hour. Or it might have been that I was expecting something else. If ease of the grind is what you're looking for, buy an electric unit. If you're off grid and/or looking for prepping equipment, this one fits the bill. Eventually I did get a nice, fine grind on the rice, to rival store bought rice flour. Since we're gluten free I won't be able to test it on wheat, barley, etc. Maybe cracked corn, though. I did purchase the sprocket to adapt it to bicycle power and the belt wheel for using an electric motor.
    1 out of 2 people found this review helpful.  Did you?
  • great addition
    By on - Verified Buyer
    I haven't used it yet, bought it for emergency use to speed things up if needed down the road. I can say this, it's heavy duty enough I don't think there will be an issue.
    1 out of 2 people found this review helpful.  Did you?
  • Love the product
    By on - Verified Buyer
    Would have payed for the assembly complete so that I don't have to search for a bike and modify it. Hope you can offer that option in the near future. I know it may be asking to much but I think a basic pedal system already known to work is good THANKS!!
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