I have an 04 700 144 that I have used at low elevation. I use 450 mains and needles in 3rd pos. This would be at 1200 ft. and cold temps. I usually ride at 6-9 thou. ft. I usually go with 340s and needles in 2nd pos. If I rode at 5000 and it was very cold, I would use 360s and needles in 3. Hope this helps!