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Old 08-13-2016, 07:32 PM   #29
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Does the suggested 15% capacity rule apply equally to single and multi-axle systems? Or should multi-axle systems be even higher because of the increased shear condition?
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Old 08-13-2016, 08:13 PM   #30
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C rated 15" tires 3960# 2 axles

Questions - sorry, but using your 85% rule, 15% load and safety margin, for 26' trailer GVW 4000# 2 axles: 1) Does GYM ST225/75/15 load range C, max weight 2150#, 50#psi work 2) Does ST205/75/15 load range C, max weight 1820#, 50#psi work, and 3) if no for either why, and 4) Opinion for minimum psi cold for each. Thanks.
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Old 08-13-2016, 09:48 PM   #31
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HERE is the link on how to calculate individual tire loads.
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Old 08-13-2016, 09:53 PM   #32
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Does the suggested 15% capacity rule apply equally to single and multi-axle systems? Or should multi-axle systems be even higher because of the increased shear condition?
The Interply Shear forces are higher on multi-axle trailers than on single axle trailers.

BUT having a 15% capacity reserve is good practice for any tire application.
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Old 08-13-2016, 10:37 PM   #33
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Originally Posted by Ky76Argosy View Post
Questions - sorry, but using your 85% rule, 15% load and safety margin, for 26' trailer GVW 4000# 2 axles: 1) Does GYM ST225/75/15 load range C, max weight 2150#, 50#psi work 2) Does ST205/75/15 load range C, max weight 1820#, 50#psi work, and 3) if no for either why, and 4) Opinion for minimum psi cold for each. Thanks.
If all we have to go on is GVW we have some additional factors to deal with. This is why learning the actual loads on the tires is important. lacking the facts we need to apply some adjustments.

Since we don't know the load balance between your axles we apply the 53/47 load split factor.
Heavy axle carries 53% of 4,000 => 2120
Heavy end of the heavy loaded axle 53% of 2120 =. 1,124

Now we apply the 85% factor.to learn the needed load capacity of the tire

1,124/.85 => 1,322#

A tire that is rated to support at least 1,322# would be OK.

BUT I think you can see how much easier it is if you know the actual tire load.
You still need to confirm you have not exceeded the 2000# rating for each axle.
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Old 08-20-2016, 08:03 AM   #34
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Following discussion.
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