use a 10-speed chain

The result: a cassette that's light

and you have one of the most shred-ready MTB helmets on the trail today

12-speed -OR- Ruby

Total capacity 43T

SPURCYCLE C70 City/Flat Bar Mirror - 70mm wahoopromo use a 10-speed chainDesigned with dedicated cyclists in mind, these bar end mirrors excel in form, function, durability, and affordability. Try one for a week, and you won't want to ride without it. Precisely designed to provide maximum utility from minimum form. Slimmed down to fit through doorways and amongst traffic but durably constructed to handle busy city activity Tempered glass to ensure optical clarity Robust, rigid arm minimizes image vibration Smooth, secure