Product Description This small part makes it possible to combine the FreeSolo™, Oval Guide™ chain guides with small diameter bottom brackets such as XT or XTR. It weighs almost nothing and simply clicks onto the base plate, making installation very easy. Compatibility:FreeSolo™ ISCG 03 + BSA chain guideOval Guide™ ISCG 03 + BSA chain guideFreeSolo™ ISCG 05 + BSA chain guideOval Guide™ ISCG 05 + BSA chain guideModels:03-39-BB Compatibility: FreeSolo™ ISCG 03 + BSA chain guide, Oval Guide™ ISCG 03 + BSA chain guide / 39 mm BB (e.g. SM-BB93 XTR)Manufacturer Number: SP-03-39-BB 03-41-BB Compatibility: FreeSolo™ ISCG 03 + BSA chain guide, Oval Guide™ ISCG 03 + BSA chain guide / 41 mm BB (e.g. BB-MT800 XT)Manufacturer Number: SP-03-41-BB 05-39-BB Compatibility: FreeSolo™ ISCG 05 + BSA chain guide, Oval Guide™ ISCG 05 + BSA chain guide / 39 mm BB (SM-BB93 XTR)Manufacturer Number: SP-05-39-BB 05-41-BB Compatibility: FreeSolo™ ISCG 05 + BSA chain guide, Oval Guide™ ISCG 05 + BSA chain guide / 41 mm BB (BB-MT800 XT)Manufacturer Number: SP-05-41-BBContents:1 x Weight: black | 05-39-BB: 0.5 g Manufacturer: 77designz UG An der Kolvenburg 8 48727 Billerbeck Germany info@77designz.com