Shimano SM-JC40 Di2 External Frame Junction Box 4-Port CheckoutSpec= 29/27.5 The Holy Roller is the

The Holy Roller is the perfect do-it-all BMX tire able to roll fast on pavement and still hook up well in hardpack conditions

Perfectly matched with the Charger damper ultra-low friction SKF wiper seals and Maxima Plush Fluid Zeb Ultimate not only looks the part but performs no matter the ride or conditions

Hardened double deadbolt to protect against twist attacks

Handlebar: Alloy

Shimano SM-JC40 Di2 External Frame Junction Box 4-Port CheckoutSpec= 29/27.5 The Holy Roller is theShimano Di2 Frame Junction BoxFrame Junction Box connects via SD50 E tube wires to four different points: front derailleur rear derailleur cockpit junction box and battery mount All Di2 components on the bicycle require the same firmware version. Using Di2 components with different firmware versions may cause malfunctions Use Di2 system checker to update component firmware from http: e tubeproject. shimano. com