Originally Posted by ticki2
... Why is it repeatedly said that trailer wheels must be min of 2600# rated when many original tires were not near that?
because MISTAKEN info has a life of its own and will not die.
the alcoa wheels a/s used for well over 10 years (until 2006) were only load rated to 2200 lbs
these 2200 lb rated rims
were used on the classics from 25 ft up to the triple axle 34....
including the 30 ft double axle SLIDE models with a gvwr of over 10,000 lbs.
yes, that's 8800lbs of combined 'wheel rating' on a 10k+ trailer
loads do shift and extra capacity is usually
a good thing, BUT don't forget the WEIGHT of higher rated rims and heavier tires...
most of these recommendations for extra capacity rims ignore 3 issues...
1. 10-15% of the trailer weight is ON the tongue and not carried by the axle/hub/wheel/tires...
so in the '4,000 lb trailer' example, that's ~ 500 lbs tongue mass and 875 lbs at each wheel/tire statically.
2. load shifting happens, BUT it's not the same as a vehicle with the wheels at the corners,
cornering/turning causing very little weight shift and braking actually UNLOADS the trailer wheelsntires...
IMPACT from bumps/holes/rails is important but it is NOT the same as overloading stresses.
3. the EXTRA unsprung weight from heavier tire/wheel packages can negatively affect trailer ride and add VIBRATION inside the trailer.
so i'd suggest caution with moving to a higher rated tire/wheel package IF it's much heavier, or STIFFER than oem specs...
on really old units moving from steel rims to an alloy usually results in LESS weight and better ratings,
which is 2 good things, but pay attention to tire mass increases from going up in size or ply rating.