This is an optional part for the CI deck found on Bridgestone's "Crossfire Junior" and "Express Junior" bicycles. *This is for the current SM-CI300 type. It cannot be installed on the older type (SM-TX35). Please feel free to ask if it can be installed, and I will answer as best as I can. This is a used item, so we are looking for buyers who understand this. Please note that the cable ties are not included, so please prepare them at a 100-yen shop, etc.