The black alloy chainring bolts are lightweight aluminium bolts that match the chainring’s finish and offer a more weight-saving, aesthetic option. Aluminium bolts generally weigh less but are softer than steel, so they can’t be torqued as tightly and may be more prone to wear or damage under high loads compared with steel.
In contrast, the stainless steel chainring bolts with backing plates are heavier but much more durable and corrosion-resistant. The backing plates spread clamping force more evenly across the chainring, increasing strength and reducing the chance of pull-through or loosening, especially under high torque or long-term use. Stainless steel can also accept higher torque and resists corrosion better than aluminium, making it a more robust choice for longevity.
If your priority is minimal weight and matching aesthetics, the alloy option is appealing; if you want strength, durability and reliability over many miles or in tough conditions, the stainless steel with backing plates is the better choice.
