Race face team race rings 9 speed middle chainringrace face team edition middle chainring features outer middle and aluminum inner rings manufactured from 7075 t6 one of the strongest alloys available today outer rings are made from 4mm thick material middle rings from 5mm thick material for unsurpassed durability rings feature race face patented shif t technology featuring hard wearing stainless steel shif t chips for dual action up shifts these rings are incredibly stiff a