Ultra tt carbon forks these forks are only supplied when you also order a ribble ultra tt frame and ultra tt seatpillar ribble ultra tt frame inc seatclamp ribble ultra tt carbon seatpillar all carbon forks with a carbon steerer require a specialist expanding stem cap we recommend the 52mm itm version failure to use this will result in damage to the carbon steerer itm carbon 1 18 expanding stem cap weight 404g