Ah thank you for the info. Keep me honest, 41psi RCTIP for that same tire for a LC200?
BFG AT KO2 LT275/70R/18 125/122R load range E
Tire Pressure BFG KO2's
- Thread starter Bendcruiser
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BFG AT KO2 LT275/70R/18 125/122R load range E
gaijin
GOLD Star
Glad to!
The RCTIP for those LT275/70R/18 tires on your LC200 is (indeed) 41psi F/R.
Happy Thanksgiving!
I have a 2013 LX570 and just installed BFG KO2s. What's the RCTIP for LT275/65R18 123/120R (Load Range E)? Costco filled them to 40psi. Thanks!
gaijin
GOLD Star
Kudus to Costco! They must have taken the time to read (and understand) the book - very rare for any tire shop.
The RCTIP for those LT275/65R18 E 123/120R tires on your LX570 is 40psi F/R.
HTH
gaijin
GOLD Star
Sure!
The RCTIP for those LT275/65R20/E 126/123S KO2's on your LX570 is 36psi F/R.
What did the tire shop inflate them to?
HTH
36 psi! So Discount Tire was doing something right...although they’re hovering around 32lbs with the temps in CO so I may bump them up a few psi during the winter! Thanks!
gaijin
GOLD Star
Yes, you should bump them up to 36psi. RCTIP means the pressure the tires are inflated to AT AMBIENT AIR TEMP. So, if it's 15 degrees out, the tires should be at 36psi when they are at 15 degrees.
ANyway, kudos to Discount Tire - good to hear at least some tire sellers are following the book.
HTH
gaijin
GOLD Star
Thanks for the kind words!
The RCTIP for those Nokian Hakkapeliita R2 SUV 285/60R18 116R SL tires on your LC200 is 33psi F/R.
Consider yourself double checked
Thanks for the kind words!
The RCTIP for those Nokian Hakkapeliita R2 SUV 285/60R18 116R SL tires on your LC200 is 33psi F/R.
Consider yourself double checked
Thanks. Discount Tire set them to 38 and that seemed wrong. Glad I checked. I certainly don't want my snow tires overinflated.
gaijin
GOLD Star
Sure!
The RCTIP for those P275/65R18 114T tires on your 2013 LX570 is 28psi F/R.
Toyo tires published an excellent monograph on how to calculate the RCTIP for non-stock tires - find it here: Guidelines for the Application of Load and Inflation Tables
HTH
Thank you sir.
gaijin
GOLD Star
Because that would be wrong.
ETA (because I don't want to appear arbitrary):
Try an example of your theory just to see if it even comes anywhere close.
What would your theory suggest is the RCTIP for P285/60R18 tires on your LC200?
If attempting to "satisfy" GVWR, then what would you do? Divide the GVWR by 4 (7385 / 4 = 1846 lbs) and then inflate each tire to that value? If so, then the tire pressure would be something well below the minimum 26psi required for that tire size. But the door jamb sticker states that the RCTIP is 33psi, so your theory does not stand up.
If attempting to "satisfy" the GAWR, then you are presented with two possibilities: 3595 / 2 = 1798 lbs -or- 4300 / 2 = 2150 lbs. Both of those would also dictate tire pressures well below the required minimum of 26psi for that tire size. Again, your theory is a catastrophic fail.
So... your theory is wrong.
HTH
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gaijin,I think this might be discussion for another thread, however since we're already on the subject I'll continue here.
On a different thread you referred me to a link for Guidelines for the Application of Load and Inflation Tables.
I understand the fundamentals of setting the LT tire pressure based on how the manufacturer set the OEM loading for LC 200.
OEM Dunlops 285/60/18 116V @ 33psi set to 2555/1.10= 2322lb per tire. Based on this, same size LT tires would have be inflated to 46-47 psi.
Having said all this if there is something that does not make sense to me I rather ask.
Isn't there a direct coloration between tire loading and axel loading?
if LC 200 has a GVWR of 7385lb, GAWR FRT are rated @ 3595, RR @ 4300lb why are the OEM tires are so much above the necessary capacity?
On a different note when I called BFG for inflation recommendation I was told to inflate KO2s to 33 psi, that didn't make any sense to me either since LT tires are not rated under 35psi.
On a different thread you referred me to a link for Guidelines for the Application of Load and Inflation Tables.
I understand the fundamentals of setting the LT tire pressure based on how the manufacturer set the OEM loading for LC 200.
OEM Dunlops 285/60/18 116V @ 33psi set to 2555/1.10= 2322lb per tire. Based on this, same size LT tires would have be inflated to 46-47 psi.
Having said all this if there is something that does not make sense to me I rather ask.
Isn't there a direct coloration between tire loading and axel loading?
if LC 200 has a GVWR of 7385lb, GAWR FRT are rated @ 3595, RR @ 4300lb why are the OEM tires are so much above the necessary capacity?
On a different note when I called BFG for inflation recommendation I was told to inflate KO2s to 33 psi, that didn't make any sense to me either since LT tires are not rated under 35psi.
gaijin
GOLD Star
I think this is where you are going astray. GVWR/GAWR are static load ratings - good to know so you can weigh your truck and determine if you are within design limits.
Tires, on the other hand, are subjected to transient dynamic loads like hitting a pothole, running over a curb, performing an emergency maneuver, etc. which require a Load Limit that exceeds your "necessary capacity" to support a static load.
HTH
gaijin
GOLD Star
Sure, as much as I can without any more info than is in the quote...
I have no idea who the OP talked to at "BFG," but on the face of it the info obtained appears to be bogus. All BFG All-Terrain T/A KO2 tires are either Flotation size or LT-Metric size. OP made no reference to Flotation sizes, so we might assume OP was asking about an LT-Metric size tire. ALL LT-Metric tires, for ALL vehicle applications, require a MINIMUM RCTIP of 35psi, so a recommendation from "BFG" to inflate an LT-Metric tire to 33psi would be incorrect.
You will have to ask @oneofew what size and construction tire he was asking about, but if it was a Flotation size tire, e.g. 35x12.50R18LT, it would be possible to receive a RCTIP from "BFG" of 33psi, but that's a lot of if's and unfounded assumptions to make much sense.
Does that cover what you were curious about, or did I totally miss your point?
HTH
