This is the Junior (18

A taller 127mm headtube not only creates an incredibly strong and stiff front end

MATERIAL: Aluminium

they're not designed for grinding

refined and well functioning cassette hub possible

Primo Freemix NDSG Plastic Hub Guard supplier_54522602160454 This is the Junior (18Plastic hub guard designed to fit the Primo Freemix hub. The Primo Freemix NDSG plastic guard come with a replacement cone that allow the guard to press fit onto it, this stops the plastic guard from getting crushed and also allow the guard to slide into your frame with ease. The guard is made from a tough nylon plastic with replacements sleeve available separately.