Roll the most expensive tractor tyre on the market alongside the cheapest and nastiest on offer and you'll be hard pushed to spot the difference.Both are round and black, both have a bead that fits them to the tractor's wheel rim and both have a pretty similar looking set of rubber lugs around the edge. But push them to their limits and you'll soon realise you're dealing with two very different beasts.French tyre maker Michelin is at the sharp end of agricultural tyre design and spends millions every year developing tyres. That means everything from the mix of exotic materials used in the sidewalls to the contours of the lug have been painstakingly engineered and tested.
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