Sunseeker 2250 tire pressure

[Delco Bobby]

I know that I should have weighed my rig but there is no place convenient to do so. I have my tire pressures set to what the door sticker says. 65 front and 80 rear. Seems fine to me.

I believe that I am no where near the maximum weight that this vehicle can handle.

I am curious as to what other 2250 owners set their pressure to, especially on the Chevy chassis.

Only Sunseeker 2250 owners should answer this post.
Just kidding, all replies are welcome. (That was an unnecessary joke)

Bobby

[geeman53]

DB -We're running the stock pressure . I have to pull the rear liners to check- no fun , but worth the trouble.

[Delco Bobby]

Originally Posted by geeman53

DB -We're running the stock pressure . I have to pull the rear liners to check- no fun , but worth the trouble.

Thanks.

[Total Loss]

I am running 65-70 (no heavy added load) in rear.
70 in front.

Read up on the Generals with their recommended pressures based on weight.
These rigs are under-loaded by a lot based on max.
80 psi is for max (14k) and probably ride like Flintstone wheels.
You are probably around 11k loaded- unless you have a lot of tongue weight.
I was at 10200 with half tanks (fuel and water) and typical stuff. Not loaded for a trip.

[Delco Bobby]

Originally Posted by Total Loss

I am running 65-70 (no heavy added load) in rear.
70 in front.

Read up on the Generals with their recommended pressures based on weight.
These rigs are under-loaded by a lot based on max.
80 psi is for max (14k) and probably ride like Flintstone wheels.
You are probably around 11k loaded- unless you have a lot of tongue weight.
I was at 10200 with half tanks (fuel and water) and typical stuff. Not loaded for a trip.

I gotta get off my butt and get weighed. There are three CAT scales in NJ that are not a long trip.

I wonder if there is a time of day when they are the least busy. Or day of the week.

[brucemc]

The max weight rating on the 4500 is 14K lbs; our running weight is 10850lbs. We still have a touch over 3000 lbs capacity, but it would depend on each Gross Axle Weight, of which I don't have the numbers handy at the moment.

Generally, tire pressure is subjective, to a point. A minimum pressure is required depending on the weight the tire is carrying. For example, our unit weighed in at the following 2 weeks ago at the conclusion of our maiden voyage:

3950 Front
1950 LF
2000 RF
6850 Rear
3400 LR /2=1700
3300 RR /2=1650

Therefore, looking at the pressure tables at Michelin (which applies to all brands - this is a federal standard rather than a Michelin standard) for LT225/75R16 E: Michelin RV Tires | View Michelin RV Tires load and inflation tables for motorhomes and recreational vehicles. | Michelin RV Tires

Pressure Load position

51 1950 LF
52 2000 RF

42 3400 LR /2=1700
42 3300 RR /2=1650

Note these are the minimum pressures for those loads. I tend to run more pressure to firm up the tires for handling and ride, but not so full that they become harsh. We are still experimenting, but we ran 65Lbs in each tire the first trip. I felt the rears were fine, but the front seemed a little soft.

Help that hopes!

[Delco Bobby]

Originally Posted by brucemc

The max weight rating on the 4500 is 14K lbs; our running weight is 10850lbs. We still have a touch over 3000 lbs capacity, but it would depend on each Gross Axle Weight, of which I don't have the numbers handy at the moment.

Generally, tire pressure is subjective, to a point. A minimum pressure is required depending on the weight the tire is carrying. For example, our unit weighed in at the following 2 weeks ago at the conclusion of our maiden voyage:

3950 Front
1950 LF
2000 RF
6850 Rear
3400 LR /2=1700
3300 RR /2=1650

Therefore, looking at the pressure tables at Michelin (which applies to all brands - this is a federal standard rather than a Michelin standard) for LT225/75R16 E: Michelin RV Tires | View Michelin RV Tires load and inflation tables for motorhomes and recreational vehicles. | Michelin RV Tires

Pressure Load position

51 1950 LF
52 2000 RF

42 3400 LR /2=1700
42 3300 RR /2=1650

Note these are the minimum pressures for those loads. I tend to run more pressure to firm up the tires for handling and ride, but not so full that they become harsh. We are still experimenting, but we ran 65Lbs in each tire the first trip. I felt the rears were fine, but the front seemed a little soft.

Help that hopes!

Wow, brucemc, that is a huge help.

My pressure is much higher than those numbers and I was concerned because I dropped lower than the 65 front and 80 rear on the door jamb.

However, I have read in several places that the tire air pressure should be set the same for all tires on the same axle.

[brucemc]

I tend to run the same on each axle, and always have. That's a good rule-of-thumb; the numbers I listed were purely based on the loads. Therefore, as a minimum, use the highest number of the two for all tires on the same axle.

RV On!

[Total Loss]

Originally Posted by brucemc

The max weight rating on the 4500 is 14K lbs; our running weight is 10850lbs. We still have a touch over 3000 lbs capacity, but it would depend on each Gross Axle Weight, of which I don't have the numbers handy at the moment.

Generally, tire pressure is subjective, to a point. A minimum pressure is required depending on the weight the tire is carrying. For example, our unit weighed in at the following 2 weeks ago at the conclusion of our maiden voyage:

3950 Front
1950 LF
2000 RF
6850 Rear
3400 LR /2=1700
3300 RR /2=1650

Therefore, looking at the pressure tables at Michelin (which applies to all brands - this is a federal standard rather than a Michelin standard) for LT225/75R16 E: Michelin RV Tires | View Michelin RV Tires load and inflation tables for motorhomes and recreational vehicles. | Michelin RV Tires

Pressure Load position

51 1950 LF
52 2000 RF

42 3400 LR /2=1700
42 3300 RR /2=1650

Note these are the minimum pressures for those loads. I tend to run more pressure to firm up the tires for handling and ride, but not so full that they become harsh. We are still experimenting, but we ran 65Lbs in each tire the first trip. I felt the rears were fine, but the front seemed a little soft.

Help that hopes!

Thanks for the hub weights.
My scale only did a complete.
I guessed (educated) on the axle/hub weight per corner.
I was very close.

I am running 65 rears and 70 front for this weekend's trip.
600 miles round trip.
No hitch load- just toad.

[brucemc]

Door Jamb labels, for reference:











--Bruce.

[Delco Bobby]

Here is a photo of mine for comparison. Notice the difference in capacity.

[Total Loss]

Update on my trip this weekend.
64 rear- 70 front.
Ran great. A little smoother in the rear.
No hitch weight- only toad.

[Delco Bobby]

I dropped down to 75 in the rear. Still at 60 in the front.

We had a lot of banging and bashing on the trip. Best guess is that the rough roads we were on were really bad. When on smooth pavement the ride was a pleasure.

After this weekend I was ready to go with Bilsteins or Koni's.

May have to invent a hoover craft RV for driving in PA and NJ.

[gandb26]

Originally Posted by Delco Bobby

I gotta get off my butt and get weighed. There are three CAT scales in NJ that are not a long trip.

I wonder if there is a time of day when they are the least busy. Or day of the week.

Can you advise where the scales are in NJ? Thanks!

[ependydad]

Originally Posted by gandb26

Can you advise where the scales are in NJ? Thanks!

Here you go:
https://catscale.com/cat-scale-locat...es=&cmdSearch=

[Total Loss]

Originally Posted by Delco Bobby

I dropped down to 75 in the rear. Still at 60 in the front.

We had a lot of banging and bashing on the trip. Best guess is that the rough roads we were on were really bad. When on smooth pavement the ride was a pleasure.

After this weekend I was ready to go with Bilsteins or Koni's.

May have to invent a hoover craft RV for driving in PA and NJ.

Bobby- try dropping the rears to 65.
Seriously- really helps and the tires can take it.
I still got 10 mpg- many hills towing 4k with those pressures.

[Tireman9]

Originally Posted by brucemc

The max weight rating on the 4500 is 14K lbs; our running weight is 10850lbs. We still have a touch over 3000 lbs capacity, but it would depend on each Gross Axle Weight, of which I don't have the numbers handy at the moment.

Generally, tire pressure is subjective, to a point. A minimum pressure is required depending on the weight the tire is carrying. For example, our unit weighed in at the following 2 weeks ago at the conclusion of our maiden voyage:

3950 Front
1950 LF
2000 RF
6850 Rear
3400 LR /2=1700
3300 RR /2=1650

Therefore, looking at the pressure tables at Michelin (which applies to all brands - this is a federal standard rather than a Michelin standard) for LT225/75R16 E: Michelin RV Tires | View Michelin RV Tires load and inflation tables for motorhomes and recreational vehicles. | Michelin RV Tires

Pressure Load position

51 1950 LF
52 2000 RF

42 3400 LR /2=1700
42 3300 RR /2=1650

Note these are the minimum pressures for those loads. I tend to run more pressure to firm up the tires for handling and ride, but not so full that they become harsh. We are still experimenting, but we ran 65Lbs in each tire the first trip. I felt the rears were fine, but the front seemed a little soft.

Help that hopes!

In general the Load & Inflation tables you find will be correct for about 97% of the tires on the road. However in my experience the Michelin brand has the most exceptions. This is because they sometimes use tires designed in Europe using Metric dimensions, calculations before rounding.

If you can find a table for your specific brand then follow that table. If you have tires from a company that does not publish tables on the internet your dealer should be able to provide. If the dealer doesn't even understand the question of Load & Inflation table you need a different dealer. In the meantime you can use just about any table and can expect to be withing a couple %.

IMO you should run 10% more inflation than the minimum needed to support the measured load on the heavier end of the axle.

[Total Loss]

Originally Posted by Tireman9

IMO you should run 10% more inflation than the minimum needed to support the measured load on the heavier end of the axle.

Agree with that.

[Delco Bobby]

Originally Posted by Total Loss

Bobby- try dropping the rears to 65.
Seriously- really helps and the tires can take it.
I still got 10 mpg- many hills towing 4k with those pressures.

OK, I will drop down but now I have to reprogram my TST 507 again.

[Delco Bobby]

Originally Posted by Total Loss

Bobby- try dropping the rears to 65.
Seriously- really helps and the tires can take it.
I still got 10 mpg- many hills towing 4k with those pressures.

I dropped down to 70 PSI according to my tireMinder gauge which was reported as 67 and 68 on my TST TPMS. The ride was definitely smoother on the local rough roads.