canter rims
- Thread starter alan
- Start date
blackduck
Explorer
engineer
Adventurer
LOL!!!!
yabanja
Explorer
I have been following all of the wheel tire posts with interest. I want to do a single wheel conversion and am resigned to having custom wheels built. I don't want the rough ride associated with the 19.5 rims as I will be spending a lot of time in rough terrain. However, they have just increased the speed limits in Utah on the freeway to 80 MPH! It is a real safety issue to be able to travel at least 70 mph here so you don't get run down and the military spec tires are not adequate. My vehicle is a 2000 short wheel base FG 4x4 (I measure 110"). It has a rear axle rating of 8600 pounds. The only tire I have found with a high enough rating that is not a 19.5" is the Toyo Open Country M/T http://toyotires.com/tire/pattern/open-country-mt-off-road-maximum-traction-tires in a 37x13.5R17LT. These tires have a 131Q rating which meets my load requirements for single wheel. So the questions are: does anyone have experience with this tire? How about with anything this wide? I haven't seen anyone propose any alternatives in this thread that have an adequate load rating other than 19.5's? Did I miss something?
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mog
Kodiak Buckaroo
Yup, unless you are running empty, with no high camper on the back, going down hill, with a tailwind, a cruising speed of 70 mph is a pipe-dream in a 2000 FG SWB (from my experience with my 2002 LWB, I sure hope I’m wrong and others are going to chime in that they hit 70mph on the flats no problem).
Since I've gone to super singles (36.7") I can 'hit' 65mph or so, but an everyday realistic speed is 55 mph. Yes, I can go faster downhill, and do, trying to build up speed for the next hill. But 'blasting' along at that 65 mph seems more unsafe then having someone riding my a** when I'm cruising at 55mph. Heck once I hit 6% hills (very common in my area), I’m down to 4th gear and 35-45mph. That is at 12,000 lbs (empty weight is 10,000) and if I am towing my dune buggy, then it is sometimes down to 3rd gear and 35mph (ahhhhhh).
The 2005 and later trucks have it a little easier with a higher final ratio (4.875 vs. 5.714) and another 62 lb-ft of torque. (FYI-max HP is at 2900 rpm, max rpm is 3400 on our era trucks)
Also remember when you are running the high RPMs to get to higher speeds, your fuel mileage is going to take a huge hit. I know you are running a flatbed now, but drag is a killer if/once you have a camper higher then your cab on. My truck in it’s current configuration (it will be lower in the future) it takes 37.7 hp to overcome aerodynamic drag at 50mph, 50.2 hp to overcome aerodynamic drag at 55 mph (for 10% more speed, 33% more HP), 65.3 hp to overcome aerodynamic drag at 60 mph (for 20% more speed, 73% more HP) and 82.9 hp to overcome aerodynamic drag at 65 mph (for 30% more speed, 120% more HP).*
Speed is a losing goal in a Fuso, IMO:ylsmoke:
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*Drag/HP calculations using: External Flow Analysis of a Truck for Drag Reduction Subrata Roy1 and Pradeep Srinivasan2,Kettering University, Flint, MI 48504-4898 Copyright © 2000 Society of Automotive Engineers, Inc. 2000-01-3500
yabanja
Explorer
"Yup, unless you are running empty, with no high camper on the back, going down hill, with a tailwind, a cruising speed of 70 mph is a pipe-dream in a 2000 FG SWB (from my experience with my 2002 LWB, I sure hope I'm wrong and others are going to chime in that they hit 70mph on the flats no problem)."
I'm glad you brought this up. I have had no problem achieving 68 mph on flat terrain in the current configuration of a stock flatbed at 9k lbs. I was under the impression that going to the larger diameter of a 37" tire would bring first gear into play off the line and make the rpm's more acceptable at 70 mph on the flats in fourth gear. Does increasing the tire diameter actually reduce maximum speed capability?
Allan
I'm glad you brought this up. I have had no problem achieving 68 mph on flat terrain in the current configuration of a stock flatbed at 9k lbs. I was under the impression that going to the larger diameter of a 37" tire would bring first gear into play off the line and make the rpm's more acceptable at 70 mph on the flats in fourth gear. Does increasing the tire diameter actually reduce maximum speed capability?
Allan
whatcharterboat
Supporting Sponsor, Overland Certified OC0018
How many posts has there been from guys who actually own 19.5's complaining of rough ride?
As for the load 131 load rated Toyo.......sounds great. Wish we could use it here in Australia. Have pushing for Toyo for it for the last couple of years but that size is not legal here. Can't understand why either but it would be great to offer a proper 17.5 mud terrain with a half decent load rating as an option to the bombproof 19.5 Toyo mud'n'snow (more allterrain IMO) .
mog
Kodiak Buckaroo
Yes, increasing your tire diameter will reduce your rpm. If you can run at 68 mph on the flats with stock tires (should be about 31.7 inch) then it sounds like a piece of cake for you when you have 37" and even better if you use 5th since it is an overdrive.
1st -5.389
2nd - 3.028
3rd- 1.700
4th - 1.009
5th - 0.722
BTW- we might be on a difference page between 'cruising' and 'achieving'. I can achieve 70mph, but neither the Fuso or I am happy/comfortable at that speed. It could be my truck's configuration (CG & drag component).
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Also on the subject of 'custom wheels', see post #90 in this Expo Portal thread (humm. . . easy access to the suspension!) :Wow1:
http://www.expeditionportal.com/forum/threads/84721-GOVE-Global-Overland-Vehicle-Economical-build?p=1435284#post1435284
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How about conti MPT81s on 20" rims, the 275/80 is 134K rated and 37.5" tall. K rating is 68mph (i think) or 110km/h.
mog
Kodiak Buckaroo
Reference - 2007 so 4.875 final drive (vs. 5.714) and 4.9 liter 4M50 engine with 347 lb-ft of torques (26% more then the 4D34-3AT3A)
mog
Kodiak Buckaroo
If you have not read it yet, make sure to check out micklongley's thread on his Humvee-Fuso wheel experience.
http://www.expeditionportal.com/forum/threads/86579-My-Hummer-wheelset-experience
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Just my opinion, since I looked into that route, is I don't think that is the way to go. One of the benefits of super singles is a match track (or very close track) of the front and rear axles. There is no way to be anywhere near close using Humvee wheels with only a 4.5” backspacing (max with flat centers). Also you would want to go with 24 bolt even spaced or better, 24 bolt paired spacing (the rim bolts not center bolts) for the rim rating so costs would go up. And 16.5 inch tires are becoming dinosaurs. The 90% military surplus is drying up and selection in commercial tires is getting tougher.
Someone like Stockton is going to charge in the range of ATW-Alan-EC-etc approved rims. So I do not see an upside if you are going to spend the $$ it might as well be on a certified/proven rim.