At Trccc we have 3 members running the novak velocity 6.5r combo with the gtb, i think 3 with lrp and couple running nosram, i dont know about the others.
The track is quite tight and medium grip, so most of us run 6.5's and a couple with 7.5's. I run the novak 6.5r and its perfect i think, the 5.5 i had was just a bit to fast for the track.
Hope that helps
Carl
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