This is the mrp amg chain guide 28 32 tooth bottom bracket fitting with integral bashguard the new all mountain guide amg is the love child of two innovative and revered product lines the 1x and xcg perfectly suited to the increasingly popular all mountain segment the all mountain guide features mrps patented integrated skid protection and shares the freshly updated upper guide from the g3 but lacks a lower retention mechanism the all mountain guide is a great choice for 5 6 travel b