i use a dmr chain tug . the left one to be specific as the right hand side has a mech hanger
i chose this one because the tug part doesnt wrap around the end of the dropout at all it just pushes against it . a small detail that makes wheel removal/insertion hassle free as the wheel nut can be wound off enough to pull the chain tug away from the dropout enough to push the wheel in and unwrap the chain from the teeth . the tug doesnt have to be loosened so refitting is easy and no retensioning required . it also supports a qr axle unlike others that wont
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