Direct power transfer. 104 BCD flexibility. Upgrade your e-bike with e*thirteen's 104 BCD Spider, designed for seamless compatibility and efficiency. This spider enables the use of any 4-bolt standard chainring, offering a practical solution for cost-effective and eco-friendly chainring replacements. Made from durable 6-series alloy, it balances lightweight strength with the flexibility to pair with both long-lasting steel and lightweight alloy chainrings. Compatible with Bosch Gen4, Fazua Ride 60, Shimano EP8, and TQ HPR50 systems, it's the ideal choice for enhancing your e-bike's performance.