I've only just got mine on the track a couple times but I too find the car performs better with ballistic buggy tyres than shumacher mini spikes.
I found a 7.5T motor in the car underpowered even with boost turned up with a low gear ratio. The car is 200 grams heavier than a Kyosho Lazer ZX 5 fs 2 sp.
No problems since replacing with a 5.5T motor. I run 35wt front, green front springs and 30wt rear with stock yellow springs. I had problems with steering, the stock servo horn will break. You need an alloy one. Also I upgraded the stock plastic ackerman parts with the TLR alloy one. The steering horn will break on a hard landing. Thanks to George I was able to replace the broken one I had recently at a club meeting.
Other than that still setting it up, but I do love it. It is waaay easier to drive than my Lazer ZX on astro. Will try the wider rear hex.
Simon
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