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38 vs 42 tyres on fendt 724
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<blockquote data-quote="Serup" data-source="post: 1710" data-attributes="member: 568"><p>I think you all really should consider the gigantic difference in tyres these days!</p><p> </p><p>If i'm not way off, the 710/60R42 is michelins xeobib. Maybe the best tyre today for tractors under 200 hp. (or bigger, if they can't use taller tyres)</p><p>710/70R38 is a "normal" wide, big volume radial, made by many.</p><p>850/55-42 is a trelleborg twin, wich is a bias tyre - totally different in construction than radials. Was great 10 years ago, when nobody made wide radial tires for smaller tractors.</p><p> </p><p>They are all about the same height - 1,95 meter</p><p> </p><p>Today i believe the xeobib is superior to twin in every aspect (maybe except price, i don't know)</p><p> </p><p>The xeobib tyre is made with what michelin calls "ultraflex" technology, and have a sidewall that is suppose to flex more than normal radials, creating a longer footprint, because it can be run with lower pressure.</p><p> </p><p>We have a tractor with trelleborg twin, and they a better than narrow radials (wich was on before) for both traction when wet, and especially flotation.</p><p>But the sidewalls are hard! No matter how low pressure i run them, they bounce when roading. (there is no suspension on it, apart from seat)</p><p> </p><p>The 710/70R38 is a good size for both volume and load capacity.</p><p>The xeobib 710/60R42 i believe is a better tire, for what it can do.</p><p>The difference is probably in load capacity, and without checking any databooks, i think the 38" can load more, because it can be used at much higher pressure.</p><p> </p><p>If you need the load capacity, and can live with the higher pressure, you need the 38" - if the load capacity of the xeobib is enough, i would prefer them hands down!</p><p> </p><p>On a general note, i think a lot of farmers could get so much greater returns from their expensive tyres if they spend the time to use them at the right pressure every time!</p><p> </p><p>I don't know any farmers who adjust pressure when they stop hauling trailers, and start drilling - they just run it at the pressure that is enough for the most demanding application, and accept more wheelslip and fuel-use when they actually could run a much lower pressure.</p><p> </p><p>When i run my trailer, i use 1,8 bar in the back wheels, when ploughing 0,8 bar, and when i have duals on, and cultivate, i run them at 0,4 bar.</p><p> </p><p>There is many publications that show the difference in fuel-use with different pressures, and the results always show a healthy benefit from the time spend changing pressure.</p><p> </p><p>Just a little input from a farmer who take a big interest in tyres.</p><p> </p><p>Jacob</p></blockquote><p></p>
[QUOTE="Serup, post: 1710, member: 568"] I think you all really should consider the gigantic difference in tyres these days! If i'm not way off, the 710/60R42 is michelins xeobib. Maybe the best tyre today for tractors under 200 hp. (or bigger, if they can't use taller tyres) 710/70R38 is a "normal" wide, big volume radial, made by many. 850/55-42 is a trelleborg twin, wich is a bias tyre - totally different in construction than radials. Was great 10 years ago, when nobody made wide radial tires for smaller tractors. They are all about the same height - 1,95 meter Today i believe the xeobib is superior to twin in every aspect (maybe except price, i don't know) The xeobib tyre is made with what michelin calls "ultraflex" technology, and have a sidewall that is suppose to flex more than normal radials, creating a longer footprint, because it can be run with lower pressure. We have a tractor with trelleborg twin, and they a better than narrow radials (wich was on before) for both traction when wet, and especially flotation. But the sidewalls are hard! No matter how low pressure i run them, they bounce when roading. (there is no suspension on it, apart from seat) The 710/70R38 is a good size for both volume and load capacity. The xeobib 710/60R42 i believe is a better tire, for what it can do. The difference is probably in load capacity, and without checking any databooks, i think the 38" can load more, because it can be used at much higher pressure. If you need the load capacity, and can live with the higher pressure, you need the 38" - if the load capacity of the xeobib is enough, i would prefer them hands down! On a general note, i think a lot of farmers could get so much greater returns from their expensive tyres if they spend the time to use them at the right pressure every time! I don't know any farmers who adjust pressure when they stop hauling trailers, and start drilling - they just run it at the pressure that is enough for the most demanding application, and accept more wheelslip and fuel-use when they actually could run a much lower pressure. When i run my trailer, i use 1,8 bar in the back wheels, when ploughing 0,8 bar, and when i have duals on, and cultivate, i run them at 0,4 bar. There is many publications that show the difference in fuel-use with different pressures, and the results always show a healthy benefit from the time spend changing pressure. Just a little input from a farmer who take a big interest in tyres. Jacob [/QUOTE]
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38 vs 42 tyres on fendt 724
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