Shimano

GRX ST-RX815 Di2, eye-catching for a gravel bike upgrade, These are great fit in the hand. Shimano put a little off-road feel into these shifters, allows me to hold tight as the hoods are sleek; I feel I have a good firm grasp on the bike, and it wont get away from me on a bumpy decent, tested on Forest park. The electric shifting is a real bike up-grade, making the shifting experience quick and efficient.

As I enjoy both a cable system bike and this electrical shifting system. Shimano is a reliable, well build system.

Di2 is not necessary nor for everyone; the gears shift like a 'mouse click', and I did it with my pinky (laughs).

It doesn't make cycling easier, you just go faster (shifting gears)

Shimano Di2 EW-SD50 E-Tube Wires; YOU NEED about 6 or 7 various lengths. All the components clip together:

It helps to understand the lengths you require, longer is better, if you have room to stuff extra in down-tube. The line through your handlebars may be longer.

Counted 6 wires: In the SEAT TUBE, Battery-WIRE-wireless transmitter-WIRE-Junction Box- Wire-Rear Derailleur. Same Junction Box -WIRE-Plug in device-WIRE-R Shifter- Wire- L Shifter

YES, To connect SHIFTERS: I drilled 2 exit holes (near the plug end) in my carbon handle bars, maybe 8cm from end (Mad Man) or consider other handle bars.

ive struggled to find cycling shoes that are comfortable on longer rides. every other shoe ive tried started giving me hot spots around mile 20 and ive just had to deal with the discomfort. i decided to try these out and boy am i glad i did. the toe box is generous and comfortable. i did a 50+ mile ride the day after i got these and at mile 50 my feet felt great. no hot spots at all. easy to adjust on the fly if need be as well which is nice. overall im very happy with these so far.

also the shimano size chart is different from your standard EU to US sizing. i got a 48 based on shimanos chart (usually i wear a 46-47EU, 12US) and they fit perfectly for my size 12US feet.

Happy with the sandals, very comfortable and hardly notice they're on when riding. So far I've rode more than 1000 miles wearing them.

Reading the reviews before I bought sounded like they ran small, so I ordered one size larger than my normal size. In my case they would have been a better fit in my normal size. Having said that, even the slightly longer sandle is fine, just a little longer than necessary. Still very comfortable.