Crankpin Assemblies
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About us
Welcome to Billet Proof Designs—we’re glad you’re here. I’m Damian, founder of Billet Proof Designs and a lifelong rider. What started as a passion project between two friends has grown into a trusted source for premium motorcycle and powersports parts. For over 15 years, we’ve built this brand from the ground up with a small, dedicated team (Dan, Mervyn and Cam) that lives and rides the lifestyle we support. We don’t just sell parts—we use and ride with them.
Riding has been my therapy, my freedom, and my joy, and we know many of you feel the same. That’s why we’re committed to offering highly curated top-quality parts, great prices, and unmatched customer service rooted in real experience. When you shop with us, you’re not just upgrading your bike—you’re joining a community that shares your passion for the road. Give us a try; I promise we don't disappoint.
Thanks for being a part of our story.
Ride on and ride hard.
Riding has been my therapy, my freedom, and my joy, and we know many of you feel the same. That’s why we’re committed to offering highly curated top-quality parts, great prices, and unmatched customer service rooted in real experience. When you shop with us, you’re not just upgrading your bike—you’re joining a community that shares your passion for the road. Give us a try; I promise we don't disappoint.
Thanks for being a part of our story.
Ride on and ride hard.
Seller feedback (14,591)
- w***n (971)- Feedback left by buyer.Past monthVerified purchaseThanks
- i***2 (1101)- Feedback left by buyer.Past monthVerified purchaseArrived fast, well packed, and as described, thank you!
- 1***7 (3016)- Feedback left by buyer.Past monthVerified purchaseAs described
- s***s (1339)- Feedback left by buyer.Past monthVerified purchaseA+ sales and service! And fast shipping!
- 0***s (387)- Feedback left by buyer.Past monthVerified purchasethank you for a good deal
- 8***4 (760)- Feedback left by buyer.Past monthVerified purchaseReally nice quality (heavier gauge metal than I expected, better quality finishing on the cuts, etc.), arrived a day before expected, and it's EXACTLY 2" diameter. As in you're going to use a large hammer and a 1 1/2" metal pipe as a pusher to beat it into a 2" exhaust pipe. Can be done, about 6 whacks with a 5 pound sledge. And no, all of that banging didn't even leave a mark on it. If I could have gotten it back out I'd have been able to return it as unused. Great product and seller.