has anyone tried using MT 8000 front rings with 105 5800 set up. I'm hoping I can just change the crank and rings and adjust the front derailleur. Any advice?
If you are looking for a relatively cheap and less complicated downgearing option, you could consider an XT cassette. I use an 11-40 eleven speed in conjunction with 5800 compact cranks. My rear mech is a 105 5800 with medium cage and I also installed a 'roadlink ' hanger extender. It works! If not for this hack I doubt I would have completed my recent 'everest' ride of a local climb. With the roadlink, new XT M8000 cassette and new chain all up it cost less than 80 euros. Ten minutes work to install!If you have a short cage mech, it may still work. Look up durianrider's videos on you tube to see for yourself what is possible.