The GB01 front end is pants. the hinge pins are weak, the arms are soft and rubbery, the hubs lurch over and give the steering a very bizzare set of angles. Normally in a 2WD you'd have around 25 degrees of caster - the mini front has at a guess zero when it's steering.
The GB02 is not as tunable - there really isn't much you can do with the trailing arms. They hinge pins are like you'd find in any 10th scale buggy - very strong for this little car, the arms are strong - the entire front end of the car is stronger and less flexible. The car just felt a lot nicer to drive - more like a real (10th) buggy on the track. Maybe someone can get the GB01 front end to work, but I tried it down on a track and found it felt a bit ODD.
The Gb01 has a lot of steering lock - the GB02 doesn't really have enough. Not sure if you could dremel the GB02 to give it more but I still found it OK on the track.
in terms of tyres I used the SC - soft compound GB02 tyres. they gave plenty of grip on the carpet and reasonable grip on the slippy. you can get some 12mm hex adaptors I think but DCM knows more about that.
when I raced the car I used aeration dampers on the back and plastic CVA dampers on the front - don't bother with the aeration dampers, they will cost about 80 quid. The blue plastic CVA dampers do the same job at this scale.
For springs I used cut down kit springs - the optional springs are all either too long, too hard or too soft in my experience.
My write up mentions all the bits I used on my GB02. I also bought the GB02 upgrade for vickys frog - since its a lot stronger and I think easier to drive.
The one thing that let my car down was the lower shock mounts - these popped off rather easily - which I fixed in my own way. The blue alloy ball studs only probably make this worse, since they are fractionally smaller in diameter.
I put on the V2.0 alloy steering from 3racing - which isn't amazing and doesnt even fit the GB02. I hopped up the original steering with an off-cut of spring to reinforce the plastic servo saver and it has less slop than the 3racing setup.
I changed the front shock mounting - which is now on vickys car. the original gb02 setup means the shocks get softer toward the end of the travel. I made brackets to move the shocks further back on the arms. This feels good on the bench but I found the front end bounced more - maybe I need to change the spring / oil to go with the new position also. so - still testing.
Overall - you aren't going to be threatening the A finals- but you saw how my car went round, definitely pretty well, and fun to drive too. you have to be smoother but its satisfying and I like it.
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