I’ve been building up a new gravel bike, which is about as far into road bike territory as a mountain biker like me can relate to. Non-boost frame, still uses a traditional skewer to secure the front wheel instead of a thru axle. One thing that threw me a bit was the use of flat-mount brake calipers. I wasn’t even aware a third form of brake caliper mounting existed.
One of the mysteries of bikes are the innumerable “standards”, which is somewhat of a contradictory term considering the growing number of them for any given piece of gear. Seems like the only thing that has remains truly interchangeable across all bikes are the threaded ends on pedals.
Pedal threads
I have an old peugeot px10 that has french pedal threads, and stronglight cranks, but that is super rare today, and most have had the threads buggered or tapped by now
0.55” x 20.32 tpi (14 x 1.25 mm)