I assume it's aluminum, didn't ask, kinda figured if it's a 520 sprocket it's for weight reduction so it should be aluminum. Yeah it was from RW. Just took my first test ride & I'm actually happy with the 15/35 gearing with 25's. Super tall but 5th sure is overdrive. If I'm in 5th now I'm cruising in the 80's and barely breathing...and DANG those cheap crappy little Cheng Shins hook up!!!
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