Please ensure your frame has carrier mounting bosses on your seat stays. WE ARE A LARGE IMPORTER OF CYCLES AND CYCLE PARTS FROM OUR OWN FACTORY IN TAIWAN, CYCLE PARTS INCLUDING PROMAX PARTS, THE 2 OWNERS HAVE A COMBINED EXPERIANCE IN THE INDUSTRY OF MORE THAN 40 YEARS, WE HAVE A 15,000 SQ FEET WAREHOUSE FULLY STOCKED. You can send us a message by using the "Questions and answers" section towards the bottom of the page.