WOW these tyres are staying. So much more grip on grass as well as better handling.
The Mad Bull / Lunch box tyres are 110mm tall compared to the stock 105mm so close enough to not need a pinion change. With the increased grip there was a bit more cogging when starting off but still not enough to be a problem. I fitted the tyres to Tamiya 2.2 inch wheels which gives them a flatter profile compared to stock Mad Bull 2.0 inch wheels.The new servo does improve the turning radius.
So far just bits from the spares box used so keeping this a cheap and cheerful project.
John
Mad Fox