ST to LT
I know for sure this has been asked and answered hundreds of times, but have you ever searched "tires" or various derivations in the fifth wheel forum? Either no matches or 244 pages! To the point...I...
Forum Discussion
Me Again wrote:Wingnut647 wrote:
What about heavier 5rs?? Ours has a GVWR of almost 17000 with 2 7K axles. We want to upgrade our tires but not sure if LT's would have a high enough load rating for what we need for our toyhauler 5th.
Currently have 235/80/16's ST's.
Sorry to jump on the post...didn't want to start a new post to ask a similar question.
Thanks
At that weight I would upgrade rims and tires to 17.5 rated at 4805 each. The 215/75R17.5 is the same diameter as ST235's. Most of the higher end units come this way now. GY G114, Michelin, Sumitomo and others.
At your weight you are pushing GY G614 to close to their limits. ST tires are a manufacturer's crime on a two axle Thunderbolt with a rig that heavy, with a 16581 GVWR.
Chris
GVWR on my 5er is 16,950#, with 7,000# rated axles, and GY G614 tires, filled to 110 psi. Last time weighed the 5er, it weighed in at 16,300# with a pin weight of 3460#.
16300# minus 3460 pin weight leaves 12,840# setting on two 7,000# axles with 4 tires that will handle 3750# each X4 =15000# covered by axles and tires....equates to a little over 21% pin weight....His 5er has a GVW of only 50# more than mine....
I would stay with G614's or go to the Sailun 637 tires
As far as putting LT tires on the 5er, a GY Wingfoot, as Chris alluded to, will put the G614's on, KNOWING they're a trailer tire, though LT's.
