Offering your existing 11-34 or 11-36 speeds to a wider gear range, 11-40 or 11-42.

Model No.: Y80A
Material: AL7075
Option: 40T/42T

This video shows the verification for our cogs of 42T & 40T. Even the huge eccentric degree caused from the climbing up from 36T to 42T makes the dropping and climbing of chain a big challenge, our unique design overcomed the problem and makes both the dropping and climbing for chain an easy and smooth action.