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Size Difference in 24.5 Semi Tires? Jump to page : 1 Now viewing page 1 [50 messages per page] | View previous thread :: View next thread |
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Eddy in TN |
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Pulaski, TN | What is the size differences in a 11R24.5 and a 28575R24.5? Found some cheap of the last size and truck has the 11R24.5 on it now. These will be going on the drive axles. Not replacing all tires. Thanks!! | ||
eddiedry |
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Wheatley, Arkansas | A 285 is a lo pro design. A 285/75R24.5 would match up pretty good with a 11R22.5 tire in a side by side. I don't think you would want 11R24.5's on the same axle or tandem as a 285/75R24.5. | ||
cotncrzy |
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PROSPECT, TENNESSEE | Eddy, I am not a tire man but I think the tire would be wider, and shorter (low pro). You know anything about corn meters? Pulling mine off today, going through them. | ||
durallymax |
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Wi | Truck tires are kinda a pain to figure out if you dont have the formulas. I don't know why they keep standard sizes and dont just label them all in metric like automotive has done for the most part as well as ag. Edited by durallymax 2/16/2012 09:19 | ||
Eddy in TN |
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Pulaski, TN | I copying this formula and putting it in my truck file!!! Thanks!! Knew the cheap tires were too good to be true!!! | ||
Eddy in TN |
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Pulaski, TN | You are correct on the tires. I would take those corn meters to a test stand and see about them. That's what I'm going to do!! | ||
cotncrzy |
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PROSPECT, TENNESSEE | where??? | ||
ekeller2 |
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So. IL | We had a trailer one time that had 22.5 low profile on one axle, and 22.5 tall on the second axle. Everyone told us it would not work but we never had and problems with it. | ||
durallymax |
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Wi | cotncrzy - 2/16/2012 07:34 Eddy, I am not a tire man but I think the tire would be wider, and shorter (low pro). . 11x25.4=279.4mm/285mm=0.98 5.6mm or 2% wider for the low pro. 11x0.88=9.68x2=19.36+24.5=43.86/2=21.93" Radius 285x.075=213.75x2=427mm/25.4=16.8+24.5/2=20.66" Radius So 1.27" Difference in Radius. Or 6% | ||
durallymax |
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Wi | Eddy in TN - 2/16/2012 07:45 I copying this formula and putting it in my truck file!!! Thanks!! Knew the cheap tires were too good to be true!!! Not necessarily too cheap to be true. You have to weigh it out. Low pro 24.5s are lighter, and have slightly less rolling resistance. However the gain from those would be lost in engine speed maybe. Here are the formulas for calculating that. 336.1355/Tire Diameter*Rear Axle Ratio*Desired Speed= Engine RPM in Direct (1:1 ratio in transmission). If you have an overdrive transmission multiply the RPM in direct by the overdrive ratio. Most Eatons are around 0.73-0.75. Here is an example assuming a 3.70 Rear end with tall 24.5s (11R24.5) 336.1355/43.86=7.66 7.66x3.70=28.34 28.34x65=1,842 1,842x0.74=1,363 You know that the Low-Pro's are 6% Shorter So apply that. 1,363x1.06=1,445 So you gain 82 Engine RPM. Only you will know what this might do for your fuel economy. For most farmers, it doesnt matter we never run enough miles. If you want I could put all of the formulas into an excel spreadsheet. | ||
ccjersey |
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Faunsdale, AL | Your trailer doesn't have any connection between the axles or side to side on each axle, so as long as you didn't put two next to each other on one side (dualed) you would get along fine with that. | ||
durallymax |
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Wi | ccjersey - 2/16/2012 09:24 Your trailer doesn't have any connection between the axles or side to side on each axle, so as long as you didn't put two next to each other on one side (dualed) you would get along fine with that. Exactly, Front to rear the suspension will just compensate if even needed (depending on suspension). Side to side could cause some wear issues Same hub (duals) would cause the most issues. | ||
Eddy in TN |
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Pulaski, TN | John Deere dealer can do it. There is a place in New Market, AL that used to check them. You can sent them to Shoup. I'll do some checking to see where. | ||
eddiedry |
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Wheatley, Arkansas | Front to rear on drive axles will not necessarily compensate for different tire sizes. | ||
durallymax |
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Wi | all depends on the suspension type, style and setup. Some do, some dont some can be converted to. | ||
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