Renthal apex 35 stemrenthals challenge with the apex stem was to keep the strength stiffness and durability of the larger 35mm diameter package at the same weight as the 31 8mm equivalent the strength stiffness and durability were all matched to the 31 8mm equivalent with just an average of 7g added to the apex this all new renthal apex stem covers all sectors of mountain bike light enough for xc racing stiff and strong enough for a 780mm handlebar the renthal apex stem features their uni