Jake Mwrote a review of Pivot Mach 4 Carbon XT Complete Mountain Bike - 2015 on January 28, 2015
Familiarity: I've used it several times
+1 to Adam's comment: This bike feels like the acceleration of the Ibis SL-R but with the suspension/ride quality of the SB5c
I spent 2 days on the Mach4 and covered 25 miles of trail from flowy sandy single track to technical rock ledges going up and down.
First thing you notice is the weight of the bike, or lack thereof. 22 lbs of rocket feels dainty under power and urges you to bunny hop any potential obstacle, climbing or descending, which the bike does willingly.
I'm coming off an Ibis Mojo SLR. Despite 2 inches less travel, I found the Mach 4 to be a fantastic climber and equally capable descending. Going up, the bike pedals beautifully with little to no bob whether smooth or mashing on the pedals for a quick incline or out of the saddle sprint. I didn't touch the pedal platform switch all weekend.
Going down, the Mach 4 squats on impact, stays calm and composed and inspires more confidence going down hill than it's 4" of travel would suggest. Only under hard impacts from 2 ft+ drops did I use all of the rear travel from which the bike quickly recovered.
If you're considering one, or just have questions, Adam at CC is the go-to guy and authority on the full fleet of Pivot's as well as any other ride you are likely to consider. 801-736-6396 ext 5630