For those like me who hate this click bait title the three products are
Rossman's magnetic GPS Mount - 2 sides to work on the top flap of a bar bag, other side takes an airtag, €49.00 bizarrely not available from Rossman cycles & is sold out
https://www.gramm-tourpacking.com/shopn ... esgpsmount
Tire fit gauge from Rossman Cycles, gives you a rough idea whether a tire will fit, for 26" 27.5 & 700, widths from 23 to 61mm. Usual problem is tyres not matching their specified sized
https://www.rossmancycles.com/toolsparts/tire-fit-guage
Crane Bell to mount inside your brifter
https://www.somafabshop.com/shop/crane- ... #attr=5116