Praxis manufactured FAZUA RIDE 50 e-bike chainring spider. The spider is compatible with all FAZUA RIDE 50 e-bike drive systems - Evation 1.0, Street & Trail 2.0. Choose the 104 BCD 4 bolt spider for mountain bikes, 52mm Boost chainline only. And the 110 BCD 5 bolt spider for road and gravel bikes.