HPR Range Extender Primaloft Power every ride with the

Power every ride with the SRAM Rival AXS Wide Power Meter Arm and Spindle Upgrade Kit

38mm front depth and 25mm internal rim width supports minimum tire sizes of 27mm

Developed to fit in any small pocket

Bicycling magazine says

Fits: Formula C1

HPR Range Extender Primaloft Power every ride with theOnly the size of a 500 ml water bottle, the lightweight TQ Range Extender integrates nicely into the frame of your e bike and easily fits into any standard bottle cage. Thanks to its Dual Charge Port, the Range Extender can be charged simultaneously with the main battery without the need to be removed from the frame. With a capacity of 160 Wh, the Range Extender has enough energy to extend your after work laps to an epic all day ride.