Problem Solvers Direct Mount Adaptor, 39.5mm offset, 100mm BB, 34.9mm clamp w/shims for 31.8/28.6These handy adaptors allow riders to install direct mount derailleurs onto frames without the necessary mounts. Works for Shimano and SRAM High Direct Mount front derailleurs Product Specifics Front Derailleur Clamp: 28. 6 (1 1 8") Front Derailleur Clamp: 31. 8 (1 1 4") Front Derailleur Clamp: 34. 9 (1 3 8") Front Derailleur Clamp: High Direct Mount Today's Stock Status Currently not available UPC: 708752064362 EAN: Not available Manufacturer Part