Nice Suntour Superbe pro rear derailleur, minor scratches and blemishes consistent with use but no damage. All pivots and springs strong and smooth, no play. Pulley wheels spin smoothly. I believe max cog is 26t for this unit. It’s really a beautiful piece of bicycle jewelry as all of the Superbe line is. This unit is friction only as I understand it but have never tried to run it indexed. Please see my other listings of cool vintage cycling components. I ship Monday-Thursday. Local pickup in Queens NY is welcome. Thanks for looking!