Our 10-year old has inherited what used to be my wife's, then our older son's 2012 Devinci Dexter XP ([example](https://www.pinkbike.com/buysell/2093408/)) in size small. He likes how squishy it is and how he can run directly into curbs and it bounces up and over.
Right now the Dexter has a 2x9 drivetrain that I'm thinking I'll replace with a lightly used NX 11-speed derailleur, Gripshift shifter and a 30T RaceFace narrow-wide ring combo that I have kicking around.
Do you have any suggestions for the cassette size?
April 14, 2021, 9:16 a.m. - Geof Harries
Our 10-year old has inherited what used to be my wife's, then our older son's 2012 Devinci Dexter XP ([example](https://www.pinkbike.com/buysell/2093408/)) in size small. He likes how squishy it is and how he can run directly into curbs and it bounces up and over. Right now the Dexter has a 2x9 drivetrain that I'm thinking I'll replace with a lightly used NX 11-speed derailleur, Gripshift shifter and a 30T RaceFace narrow-wide ring combo that I have kicking around. Do you have any suggestions for the cassette size?