p.mat, are those driving days you've listed or rest/activity days? For your own purposes, I'd definitely make a schedule which included both.

Although you've asked for road suggestions you haven't said anything at all about what sort of riding you like, what sorts of activities you enjoy, or in fact anything else about who you are and what you're looking forward to. Again, this makes it difficult to make suggestions; everyone here who is eager to share ideas has had experience with offering lots of suggestions to someone who responds by saying, for example that actually they're sticking 100% to pavement, will be staying mostly in nice, urban hotels, don't do their own bike maintenance, and/or have no interest in local culture beyond its place in their Instagram photos.

I'm not saying any of that's you--merely that it might tend to discourage participation in your thread. What works best--again for example--is if you post that you'll have 2 days between Banos and Machu Piccu (almost impossibly rushed, IMO), enjoy easy dirt roads and off-the-beaten track travel (definitely impossibly rushed), like staying in smaller cities and meeting local people (no problem), and hope to do a bit of high-mountain hiking to spice up your roadside sightseeing (no way). Then I come along and suggest you detour through Huanuco and Huancayo, suggest some routes for doing so and some places to stop along the way, tell you what a great time you'll have, and suggest you add a week to your trip. Or maybe 2 weeks. And that's just one little section in a vast continent.

FWIW, I was in a tremendous hurry along a similar route, and I spent a week and a half between Banos and Cuzco, wandering in and out of the Amazon basin, the high Andes, and the coastal deserts. Then I added another half a week in and around Cuzco, Machu Piccu, and the Sacred Valley--again, hurrying like crazy. But there are people here who moved a lot more quickly than I did, and some of them seem to have had a good time doing it. They just skipped most of the places I went to, and spent far less time lallygagging around even when we went the same places. Horses for courses, and that sort of thing.

I think it's be sensible to start further south, probably in an area where bike purchase would be easily (e.g., Peru). You'll object that you really, really want to see Colombia and Ecuador, which is fine but misses the point that in four months you're going to be skipping most of the continent anyway and need to make some hard choices.

I'm going to shut up now. I can hear myself rambling excessively, and I think that's mainly because I'm recovering from surgery and can't do much except sit around and daydream. So welcome to the HUBB, and I hope you'll find some of the above useful (and continue posting as your trip unfolds)!

Mark