Well i reticently bought a Sahara 150cc buggy with a blown engine i decided to replace the 150cc engine with a 600cc Honda cbr engine. To do this i have extended the rear chassis by 350mm and I'm going uprating the brakes, suspension, steering and tyres where on line is the best place to buy tyres and what brand would be best to buy I'll be using it on a mix of dirt shale concrete and tarmac.