Shimano FC-R8100 Chainring Fixing Bolt and Nut

No, these fixing bolts are specifically engineered for the 12-speed FC-R8100 series cranksets. They are not backward compatible with 11-speed R8000 or older systems due to differences in the chainring interface and bolt geometry.

Yes, this kit contains the complete set of M8 x 10.1 mm bolts and nuts required to securely attach both the inner and outer chainrings to your FC-R8100 crankset.

You will need a standard Torx T30 wrench to tighten these bolts. It is highly recommended to use a torque wrench to ensure you hit the specific manufacturer-recommended torque settings to prevent damage to the aluminum hardware.

These bolts are optimized for the specific thickness and asymmetric 110 BCD design of Shimano's R8100 chainrings. While they may physically fit other rings, we recommend sticking to genuine Shimano components to maintain the intended shifting precision and structural integrity.

It is best practice to apply a light layer of high-quality bike grease to the threads before installation. This prevents the bolts from seizing over time and ensures you can achieve an accurate torque reading.