A lot has changed over the years. Things used to be simpler or maybe even simpler. MTB was 26", a wheel was with quick-releases, brakes were only done on brake rims and there were not 50 different brake pads....
Nowadays, things are a bit more complex. That is why we have explained all the options in detail under 'Technical'. In our configurator we list everything clearly, we are available 24/7 via e-mail, and more than 80 specialised dealers are ready to help you.