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05-31-2018, 09:43 PM
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#15
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Senior Member
Join Date: Dec 2015
Posts: 204
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Just want to confirm... Load Range (e.g., Load Range H) is separate nomenclature from a speed range rating - Correct?
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05-31-2018, 10:33 PM
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#16
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Senior Member
Join Date: Apr 2013
Posts: 148
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Load range and speed rating are completely different.
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05-31-2018, 11:57 PM
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#17
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Senior Member
Join Date: Feb 2015
Location: Grapevine, Tx
Posts: 5,634
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My tires have "Max Speed 75mph" molded into the sidewall.
__________________
2004 Fleetwood Southwind 32VS W20 - SOLD!
ReadyBrute Elite towing a 2017 Ford Edge Sport
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06-01-2018, 05:33 AM
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#18
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Senior Member
Monaco Owners Club National RV Owners Club Workhorse Chassis Owner
Join Date: Dec 2013
Location: St. Charles MO
Posts: 4,920
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After reading thru these the point was made about load range and I know I got caught up in the conversation about the letters and I’m pretty sure now that at least on my Toyo’s that it is a load range not a speed rating. I believe it actually says Load Rating on it?
__________________
2002 Monaco Windsor 40PST 2019 Equinox 1.5L, Blue OX Aventa LX tow bar, Roadmaster EZ5 baseplate, SMI Stay-In-Play Duo, TireSafeGuard TPMS
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06-01-2018, 07:25 AM
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#19
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Senior Member
Monaco Owners Club
Join Date: Sep 2014
Location: UK
Posts: 542
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The load rating in the image I posted is the number 148/145, M is the speed rating.
__________________
98/99 (not really sure) Monaco Windsor DP
Engine swapped (yer like all the YouTubers) with ISC 8.3 (not an LS)
Victron Quattro 12/5000/220 with all the bells and Whistles + Hubitat Home Automation
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06-01-2018, 08:29 AM
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#20
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Senior Member
Tiffin Owners Club
Join Date: Apr 2018
Location: Pelham (Birmingham) AL
Posts: 400
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Tires specify both.
For the speed rating, you usually see something like
225/50ZR17
Where the Z is the speed rating. But Z is not very specific so there might be a space, followed by another letter. Such as W, which is more specific.
Load range is sometimes labeled as such "Load range E" for example. But then again, sometimes it is added to the end of the size stuff.
Best bet is to look up the specific tire on the manufacturer's web page and get the numbers directly from them.
Looks like most of the "big wheels" (22.5) are 75mph certified, but load range can vary a bit.
__________________
Bob Hyatt
2018 Tiffin Allegro 32SA
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06-01-2018, 09:25 AM
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#21
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Senior Member
Join Date: Jul 2017
Location: Benton, AR
Posts: 1,062
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Quote:
Originally Posted by Bob Hyatt
Looks like most of the "big wheels" (22.5) are 75mph certified, but load range can vary a bit.
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22.5 tires over 295 width vary quite a lot in speed rating. Fro example my 315 tires come in 55 MPH, 65mph and 75 MPH varieties.
__________________
2009 Country Coach Veranda 400, ISM 500, Aqua Hot 525D
2019 Lincoln Nautilus 2.7L Toad
2020 Lectric XP E-bike (Hybrid)
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06-01-2018, 10:58 AM
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#22
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Registered User
Holiday Rambler Owners Club
Join Date: Nov 2013
Posts: 215
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Quote:
Originally Posted by Bob Hyatt
L = 75mph. What idiot is going to drive a motor home and exceed that rating? 
M = 81mph.
Every letter goes up 6 or 7 mph. All the way up to Y at 186mph or so... |
I've been passed by more than a few while doing 75 in a car! I just hold the steering wheel tighter ready to take evasive action should they have a blow out and loose control of their rig.
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06-01-2018, 11:09 AM
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#23
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Community Moderator
Newmar Owners Club
Join Date: Feb 2011
Location: Point Pleasant Beach, NJ
Posts: 31,546
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I can't believe someone would actually be crazy enough to drive any RV 102 MPH.
__________________
Tony & Ruth........... FMCA#F416727
2016 London Aire 4519, Freightliner chassis, Cummins ISX, 2018 Jeep Wrangler Unlimited, Blue Ox Avail with AF1. TST 507 TPMS
No amount of money can buy you an extra second of time.
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06-01-2018, 11:29 AM
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#24
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Senior Member
Join Date: Nov 2014
Posts: 225
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FWIW Tire pressures need to be where they're supposed to be for the weight they're carrying. Not soft for comfort.
__________________
1992 Foretravel Grand Villa 3600
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06-01-2018, 09:16 PM
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#25
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Senior Member
Join Date: May 2017
Location: Metamora, MI
Posts: 5,525
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Not supporting 102mph in an RV, but I suspect the speed range is for extended driving at that speed max.
The issue is likely heat and centrifugal force. When both go up, that's when trouble starts.
Warm tires probably are more speed capable than once they get hot.
__________________
2002 Newmar Mountain Aire Limited 4370 w/ Spartan K2 and Cummins 500hp
ASE Master Certified (a long.....time ago...)
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