You and a friend roll out together, ride the same loop, stop at the same café — and the two computers on your bars disagree about how far you just went. Neither of you took a detour. It happens often enough that Strava keeps a help page devoted to the question.

Search for a wireless bike computer and you get three machines that barely belong in the same category: a head unit listening to a magnet sensor near the fork, a GPS unit that needs nothing on the wheel, and a round display that is really a second screen for the phone in your pocket.

Three lanes of wet interstate, traffic bunched up, spray coming off every truck. You check the mirror, see nothing, start to move over — and the car sitting exactly in the gap your mirror does not cover leans on its horn.

You have read enough close-call threads to want blind-spot radar on the bike, and now you are staring at two very different price tags: a $399 screen with the radar baked in, or a $103 box that bolts onto the cockpit you already ride.

A driver pulls out of a side road, clips your front wheel, and swears blind you were speeding. Two weeks later your inbox has a claim that splits the blame fifty-fifty, your premium is creeping up at renewal, and you have nothing but your own word to fight it.

You get home from a ride where a driver swerved into your lane, screen-recorded the clip to send to your insurer, and hit play expecting to hear the car's horn and your own shout — and instead it is a wall of wind.

You tip into a downhill hairpin, stab two quick downshifts to set your entry speed, and feel the rear tyre skip and chatter underneath you as the engine fights the wheel — that stomach-drop half-second where the back end steps out and suddenly you're managing a slide you never asked for.

That rear tyre has done a full season with you — squared off a little through the middle, still showing tread out at the edges — and you're standing in the garage wondering if it's got one more summer in it.

You crouch by the rear wheel before a ride, run a thumb across the tread, and catch yourself doing the math every rider does eventually — is there one more trip in this tire, or is today the day it comes off? Tread that still looks okay makes it an easy decision to defer.

You have the dash cam in your cart, your finger is over the buy button, and then the thought lands — wait, am I even allowed to record other people on the road? It is a fair pause.