i went to my LBS to buy a Euro Asia 17T cog today to replace my strippers 16T. People on here told me that the gold chain on the TT's were 1/8 so i asked the LBS guy for a 1/8" cog. After the install the chain would seem to fall out of the cog under cranking, so we then tried the 3/32" cog and it fit perfect. SO THEREFORE STRIPPERS USE 3/32" COG NOT 1/8" Hope this helps.