I've heard nothing but good things about the Ripsaw, however, I upgraded my ZR to the 1.375" lug, same track that comes on the SnoPro ZRs and I love it! Does a great job on and off trail. However, a bit more expensive than the Ripsaw.
You can pick up a new 1.4" For the ZR for $299.00 on Ebay, They were only made that length for Cat by Camoplast . I found one for $279.00 from Highmark on snowest, plus shipping. My sled is an 01' ZR800 and would spin like crazy with the stock 1.187" track, I then put a 1.5" on it last year, along with a 900 top end etc..... and it hooks up awesome, but I also went to the 900 gearing (26/41). I only got the 1.4" after following my buddy through some trees and ripp about 6 lugs, trees for traction kinda deal.
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