I have had really good luck with the Camso Backcountry X2. Have this track on everything in our shop. 129" MXZ and our 137" as well. The track has stood up well with no lugs missing on any of them. The Backcountry X2 hooks up really nice on hard park trails as well. It is just a good all round track.
On the XM and XS chassis the track Being 15" wide. There is no rubbing on tunnel or suspension brackets.
Gearing on our 137" is at 23-45. I like a little speed at time on trails. Also no issues with 23-45 in the backcountry were we do most of our riding.
The Cons are...on the Gen 4 MXZ chassis with short chain case. The track will rub on the tunnel top corners. From what i understand 1.75" is max allowable lug height with the short chain case.
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