I'm using 6.5'' doolies and 153 1.175 studs in std. susp.F7. First couple hundred miles I was unsure of the doolies. They eliminated darting but was'nt confident in the corners. That changed this weekend when I increased ski pressure!! Put on 300 miles this weekend and it's like a new sled!!! Absolutly NO darting and rails in the corners. I could'nt believe the improvement a little ski pressure made. I'd recommend them.
I tried the 6" Doolys on mine and thought they were absolutely worthless... no darting, but no steering too! Put the 9" Stud Boy Shaper bars on, and WOW, what an improvement over anything else I've tried so far!!! Do a search on this site for doolys and/or shaper for lots and lots of feedback from older posts. -- Roy
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