Its a weight issue pure and simple. Take a popular A/C like the B737. 4 Main wheels, Weighing approx 100 kg each, taking the weight of each MWA into account, I would guesstimate that you would need a 15hp 3 phase a/c motor, weight approx 5kg, assuming you could find one that would fit into the axle together with the wheel speed transducer for the antiskid. Airframe hardware (cables, relays, clamps, CB's etc) would come in at 10kg PER wheel. So 60kgs at 10 sectors a day of an average of 1 hour, I would put the revenue loss/weight penalty at 200000 euros a year, per aircraft. I have no Idea what the savings in tyre maintenace would be, but to be fair, lets say I doubles the life of the tyre, that would put the savings at 50000 euros a year assuming a wheel tyre replacment and overhaul/inspection costs in the range of 1000 euros and each wheel lasts approx 400 landings instead of 200. Now try to sell that one to MOL
Brgds
Doc