[DETAIL]<br>5/6/7 Speed Bicycle Cassette 11-21T/26T/28T Bike Sprocket Bike Cassette Freewheel<br>Compatible with<br>Brompton Folding Bicycle Cassette Flywheel<br>Feature:<br>1.Upgradable Speed Design:<br>Easily upgrade from 3-speed to a higher number of speeds, the bike cassette freewheel allowing for precise gear control and adapting to different riding scenarios and rider preferences.<br>2.Hollow Lightweight Construction:<br>Utilizing advanced hollowing techniques, the bicycle freewheel significantly reduces weight, minimizing the burden during rides and enhancing overall riding comfort.<br>3.High Strength and Durability:<br>Constructed with high-quality metal materials, the bike sprocket ensures stable performance and long-lasting durability even under intense usage conditions.<br>4.Multiple Spec Options:<br>Provides a variety of bicycle cassette specifications to cater to the individual preferences and requirements of different folding bicycles and riders.<br>5.Premium Anti-Slip Teeth:<br>The bike freewheel's teeth are specially designed to enhance engagement with the chain, effectively preventing slippage and ensuring safe riding conditions.<br>Specification:<br>Origin: Mainland China<br>Main Material: Steel<br>Color: Silver Black<br>Specifications: 5S/6S/7S<br>Size:<br>About<br>5S 86mm (3.39in) X 86mm (3.39in) X 22mm (0.87in)<br>6S: 106mm (4.17in) X 106mm (4.17in) X 25mm (0.98in)<br>7S: 115mm (4.53in) X 115mm (4.53in) X 28mm (1.10in)<br>Net Weight: About 101g/152g/190g<br>Gear Ratio:<br>5S:11-13-15-18-21T<br>6S:11-13-15-17-21-26T<br>7S:11-13-15-17-19-21-28T<br>Note:<br>This freewheel uses a 10-speed tooth profile and is specially designed to compatible with Brompton Folding Bikes. Please use it with a 10-speed or above chain.<br>Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!<br>Please allow 1-2cm measuring deviation due to manual measurement.<br>1 x Bike Freewheel<br><br>[ATTRIBUTES]<br>- Flywheel Adjustable Gear Number: 7-speed<br>- Material: Steel<br>- Gear Teeth: 20 - 26T<br>- Flywheel Adjustable Gear Number: 7-speed<br>- Material: Steel<br>- Gear Teeth: 20 - 26T<br>- Freewheel Speed: 7<br>- Origin: Mainland China<br>- Components: Freewheel