Originally Posted by
SoSmellyAir
The stiffness maybe all marketing, but I generally prefer stiffer shoes with some carbon. The other differences I noted above are based on my personal observations rather than any Shimano marketing materials. I would have bought Shimano MTB SPD shoes too except I got my SH-RX600 cheaper than SH-XC502, and my SH-RX801 cheaper than SH-XC702. Both pairs of my gravel shoes are the whacky, less popular colors, so I got stiffer shoes for cheaper.
I agree in liking a stiff shoe. Having a carbon mid sole on my XC7’s solved a foot pain issue, the XC7 is listed as a mt bike shoe. Not getting the so called gravel versions.