Guide wheel: 8T, the guide wheel is made of nylon fiber, which can effectively reduce the friction noise when the chain and the guide wheel are engaged Flywheel: Compatible with 11-28T flywheel Weight: Net weight 90g, with accessories 99g Product name:5-6-7 speed rear derailleur Applicable:for single hole frame, refer to the picture Converter-Usage: 1. Put the arc gasket on the transmission mounting column of the frame 2. Fix the converter to the mounting column with M5x6 screws 3. Install the rear derailleur and fix it withmm 4x16 screws+ nuts Colour:C:Black-Red Material:alloy Package Contents: 2 * 201 stainless steel M5x18 countersunk screws 2 * 201 stainless steel M4x16 countersunk screws 2 * 201 stainless steel anti-loosening nuts 1 * 201 stainless steel M6x6 cup screws 1 * aluminum alloy converter 1 * plastic arc gasket Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.