The Onza T-Rex 26" Trials Frame is a bombproof Trials Specific Frame Designed for intermediate trials riders to use in competition environment. As such it was specifically designed to be used without a seat and many hundreds were sold and are still being sold. We have seen a demand for the addition of a seat and so designed this special adapter to fit a seat retrospectively. The centre frame gusset is fitted with four threaded holes and a centre 'hog' hole. The bracket has four matching through holes and comes complete with four allen key bolts. The adaptor can be purchase with or without allen key seat clamp and it takes a 27.2mm seat post.