A big tire is better for straight riding, but it will slow down handling. Its not about having most wide tire on the ground for better handling, narrow tire gives you qicker handling and fuel consumption too. I think the reason they started using the 17inch rim is because of tire choice from race bikes, suddenly you can use a slick tire on a offroad bike with best grip. And yes 140 is max i would use on the original rim, wider it may pop off the rim.
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