New tires now bouncy

[Newcamper]

Hello. I’ve had my TT for 1 year. My OEM tires, TowMax STR Power King Radial load C 205/75 R15, needed to be changed. We put on 4 new Goodyear Endurance HD 205/75 R15 load D today. The ride is now really bouncy and doesn’t feel right at all. Any suggestions on what it may be would be greatly appreciated!! I checked the tires pressure and they are where they should be.

[Route 66 Traveler]

What is "Where they should be"?? I have the same tires and inflate them to 60psi according to the Goodyear inflation chart. Did you have them balanced after the install? My trailer scaled loaded at 6900 pounds and has a GWR of 7700#

Mine run smooth with no bouncing @ 65mph.

[Newcamper]

They were inflated to 65psi which is max. I think I need to do some additional homework or have my husband do it. Thanks for your response.

[Jagiven]

When you say "really bouncy". Is the trailer physically bouncing, or does the truck feel like it is porpoising more when driving over railroad tracks, expansion joints? Some porpoising is not unusual. Some roads are horrid, I found I just have to change lanes.

Have you brought your combo to a CAT scale? Now that you have had your TT a year, you may have the load unbalanced and it is affecting the handling.

Once you understand your weights you may want to adjust your WDH. Might want to adjust your tire pressures. In my TT, I run max tire pressure, but in my TV, I bumped my rear tires up 10 psi, and my front 5 psi. I experimented over a few trips, to find what felt right.

https://www.jaycoowners.com/forums/f...v-tt-3871.html

[Murff]

The attached might help!

Unless your trailer weighs 4300 pounds per axle, you are probably over inflated.

Murff

[16WhiteColly]

Load range D will be a stiffer sidewall will not flex like the C, which can cause some harder ride.

[Newcamper]

Thank you!

[mrmom]

Agree with others, you are probably overinflated with the new tires. I upgraded to the Goodyear's this year & found the same problem, trailer bounced a lot with 65psi. I used the Goodyear inflation chart and set mine to 50psi for my trailer/axle weights. Rides much better.

[jeffmcpa]

What tire pressure does the sticker on the outside of your trailer call for?

[Route 66 Traveler]

Originally Posted by jeffmcpa

What tire pressure does the sticker on the outside of your trailer call for?

Once you change tire size or load range the sticker is not correct.

[Newcamper]

Thank you for everyone’s reply. I was thinking load range D was better but am now thinking of returning the tires and going back to C. First I will look at the guidance here and lower the PSI if needed. You’ve all provided a lot of good information and I’m grateful!

[Route 66 Traveler]

Originally Posted by Newcamper

Thank you for everyone’s reply. I was thinking load range D was better but am now thinking of returning the tires and going back to C. First I will look at the guidance here and lower the PSI if needed. You’ve all provided a lot of good information and I’m grateful!

Personally I think that would be a mistake. My OEM tires were Load Range C and I felt much better when I upgraded to Load Range D.

Try the advice you have been given first;
1. Adjust your tire pressures according to weight carried.
2. Have your tires balanced.
3. Verify your hitch is setup properly
4. Verify you have the correct amount of tongue weight.

As I mentioned previously my trailer with the Goodyear Endurance tires tows very smoothly with no bounce whatsoever. Yours should do the same.

[Flyrotor]

Load range D will be better, it gives you a lot more room for your load before you are maxing out and risking tire failure.

I think Jayco and most the trailer manufacturers put the smallest rating tires on the trailers due to cost, and barely meet minimum requirements for the max load.

More than likely the C rating tires were absorbing a lot of the bounce, pushing their limit even more, and now the D rating tires are carrying the load, which means some of the bounce will transfer to the truck, but ultimately is more appropriate for your trailer.

My opinion...

[Riich]

If I were you I would never go back to C rated. Proper inflation is the key, the higher load range of the D's will serve you well in the long run.