From how I understood the comments about 4Lo above, it's not so much about 'need' as it is about how it is useful.You can do all of Imogene in RWD. 4LO? No, only trail needing 4LO is the wall at Poughkeepsie. Going down black bear would be good just for maintaining speed without burning the breaks. Summit is not the difficult parts of the state, actually rather easy which is why a lot of Colorado people go once. There are better challenges near Denver. You have 0 to worry about! BTW this is coming from the very guy that nearly rolled in 2012 on Poughkeepsie
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Generally speaking, you're right. Nothing other than Poughkeepsie Gulch is even mildly difficult on all of the trails we do for the FJ Summit.
However, the use of 4Lo is not about difficulty. It's about an appropriate gear ratio for the terrain, for the grade you're driving on and the speed of your travels.
In the case of Imogene Pass, I can think of many areas where it is useful and better overall on the vehicle to use 4Lo on the way up and the way down.
For starters, I'm pretty sure that the maximum speed limit on the trail is 25, and for much (most?) of the trail, that's actually even too fast (if we're considering appropriate speeds for conditions, etc).
Then, the grade on the area just after Camp Bird Mine (if you were to take the short cut) gets slightly steep for a little while, and then much of the way on up from the mine and dam area just before the big ascent begins is steep enough to warrant using 4Lo as well.
Then, on the way down, immediately upon leaving the summit of Imogene Pass, the steepness of the road there makes it an obvious area to want to have 4Lo, and it goes back and forth like that the rest of the way down the Telluride side.
Again though, it's not about 'need' as much as it is about usefulness and a good idea. :bigthumb: