The renthal apex stem features renthal39s unique new clamping system which allows much of the apex stem body material to be removed whilst retaining the strength and stiffness demanded by modern wide handlebars the clamps are inserted over the small diameter section of the handlebar and slid into the centre giving a 240deg wrap of the handlebar the renthal apex stem construction comprises a fully cnc machined 2014 aluminium body and 7075 aluminium clamps an oversiz