thank you sirI assume you mean the Goodyear Wrangler DuraTrac LT295/65R18 127P Load Range E tire.
If so, the RCTIP for the LT295/65R18 tires on your LC200 is 39psi F/R.
HTH
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thank you sirI assume you mean the Goodyear Wrangler DuraTrac LT295/65R18 127P Load Range E tire.
If so, the RCTIP for the LT295/65R18 tires on your LC200 is 39psi F/R.
HTH
Apologies, but I was confused about some terminology. I was under the impression that you were calculating on gross vehicle weight, and additional weight affected the RCTIP. However, I now see that GVWR is the vehicle itself plus the maximum allowable payload. So additional weight (mods) doesn't come into play so long as I don't go over GVWR.
This might be a silly question: Does loading 1,000lb swing (6,300 empty rig to 7,300lbs family + mods) affect the amount of force on the tires and change the contact patch with the ground? I the suspension keeps things in proper order?
BFG KO2 LT285/65-18. 125/122R
I can't seem to get into the website you listed to check myself.
Hello @gaijin I just bought this wheel and tire set from the person who bought This LC I'm sure there will be a build thread from him soon.
Cooper Discoverer AT3 XLT LT285/65/18 125/122S E4
2014 LX570
Thanks !
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@gaijin I've gone through more pages of this thread than I'd like to admit, going back and forth between your recommendations for people's LC200 psi, and the GVWR / GAWR rating on my 2018 LC door panel badge. I seem to be just slightly off your recommendations based on my GAWR (RR). I keep coming up with about +2 psi needed compared to what I see recommended here. What am I doing wrong? Here are the calculations I'm doing:
GAWR (RR) = 4300 LB / 2 = 2150 LB
LC manual says to adjust tire rating by 1.1x --> 2150 LB x 1.1 = 2365 LB rating needed
Goodyear Wrangler UltraTerrain AT - LT285/65R18/E (125/122Q)
In the tables, I see my LT285/65R18 @ 2365 LB needs something between 40 PSI (2235 LB load) and 45 PSI (2425 LB load).
So I'm basically interpolating between that range and coming up with:
44 PSI (2387 LB load) to support my 2365 LB rating needed from the calculations up above.
Is 44 PSI correct? I'm seeing recommendations for 42 PSI elsewhere in this thread for the same type of tires (LT285/65R18/E).
@gaijin
As an imposter on this 200 board, I humbly submit for your scrutiny my calculations for a 2006 GX470.
Vehicle has been modified, however, and I have used a spreadsheet to calculate adds/deletes based on GVWR (e.g., two passengers at 150 lb each instead of eight passengers at 150 lb each, rear seats delete, add accessory weights, and so on). Understanding that this is likely not perfect, my calculations show 602 lbs over 6200 lbs sticker GVWR, so 6802 lbs. (Note: my 'going to Death Valley for eight days' weight is likely to be higher still, but I'm too embarassed to talk about it here.) The currently installed heavy-duty aftermarket suspension is the psychological blanket I am using in place of an official GV upgrade (common in AUS, less in US) to support the rationalization that the overage is acceptable.
- GVWR: 6200 lbs
- OE: P265/65R17 @ 32 psi (door sticker in image)
- Load Inflation Table = 2260
- P-Metric to LT-Metric conversion = 2260/1.1 = 2055
- New Target: LT285/70R17 @ 2055 = psi figure outside of (below) chart range, which starts at 35 psi
- Note from one of your previous posts: "It is unsafe to run ANY LT-Metric tire on-road at less than 35psi. This can lead to excessive temperature build-up and premature/catastrophic failure."
In the Load Inflation Table, the LT285/70R17 @ 2175 lbs/psi is just above the 35 psi mark.
- According to a calculation found in one of your previous posts: 600 lbs / 5 = 120 (common rounding)
- Add 120 lbs to 2205 lbs/psi = 2175
What is the proper RCTIP? Simply estimating "37 psi" feels too arbitrary after all the math that got us to this point.
My gratitude for your patience and expertise, in advance.
EDIT 1: I did not pay enough attention before leaving the tire shop, and now have about 1,000 miles on these LT tires, when I thought I was getting 'the same' P-version of the tire. Now, I'm working with what I've got...and remembering to pay more attention next time. [head desk]
EDIT 1: Tire type is Falken Wildpeak AT3W LT285/70R17
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You are pressing me on two points where I currently do not offer advice:
1. I only recommend RCTIP for LC200-series vehicles.
2. I no longer engage in any discussions, no matter how hypothetical, about tire pressures for vehicles that are running over the GVWR.
That said, I must admire your dedication to getting to a solution on your own. I can only guess you used my favorite online Load and Inflation Table Guidelines as a source: Toyo Guide for Load and Inflation Tables
Based on your work, and your correct understanding that no LT-Metric tire should be run lower than 35psi on road, I can agree with your conclusion that if your rig were stock, the RCTIP would be 35psi F/R.
As comments on your work, and in no way to be construed as any kind of recommendation or agreement that it is OK to run any vehicle above its GVWR, I can suggest you might want to look more closely at these two points:
1. Any calculated GVW above the GVWR should be evaluated for its impact on 4 wheels - it appears you are assuming 5 in your calcs. You should be dividing by 4, not 5.
2. GVWR "upgrades" are performed by government licensed shops in Australia. There are no such shops for GX470's in the U.S., so you will see no GVWR upgrades for your vehicle in the U.S. Any shops that do work on other types of vehicles such as heavy trucks, etc. and have a working relationship with the manufacturer of that truck, can apply for and be granted permission to change a vehicle's GVWR - even then, this is almost exclusively done when a vehicle is new and before it is delivered to its first owner.
HTH
Thanks in advance. I am both an old LC owner 1996 and a new HE owner. What is the RCIP for Nitto Ridge Grappler LT285/60/18 for a 2020 LC?
Thank YouThe RCTIP for the LT285/60R18 E 122/119Q Nitto Ridge Grappler tires on your 2020 LC200 is 46psi F/R.
HTH
Hey Gaijin! It took me ages to figure out how tire sizing works and now i'm out here in the dark googling tire pressures. Head about to explode...
Recommended tire pressure on LT 285/55/20 Geolander G015's? Load index "122", Speed rating "S".... ?
THANK YOU!
I'm guessing these aren't going on your Prius, but can you please tell me what vehicle these are going on?
Hey Gaijin! It took me ages to figure out how tire sizing works and now i'm out here in the dark googling tire pressures. Head about to explode...
Recommended tire pressure on LT 285/55/20 Geolander G015's? Load index "122", Speed rating "S".... ?
THANK YOU!
lol nah not the Prius! Its the other "eco-friendly save the planet" vehicle.....the 2014 LX570, no trailer being pulled and usually pretty empty inside.