Topeak's Ridecase is the BEST Bike Smartphone holder in the world, but they have limited cases!
Topeak doesn't have a ridecasse for your phone? NO PROBLEM
You can glue* this adapter to a regular case and transform it in a ridecase for topeak.
*SuperGlue or 3M VHB tape (the same used in GoPro mounts) is recommended
Ridecase for ANY PHONE!!