View Poll Results: Would purchase a new set of 6 19.5" tubeless wheels?
Yes, I'd be interested in buying a new set of wheels.
35
62.50%
No, I'll keep looking for a used set
3
5.36%
I already have a set of safe wheels
11
19.64%
I'll take my chances with my Widow Makers.
7
12.50%
Voters: 56. You may not vote on this poll
Group purchase of big truck wheels
#166
09-24-2009, 08:49 AM
Havi~
One thing to consider when going to a 19.5 or even a 22.5 tubeless rim are tire sizes available, and what you want to do with the truck. How fast would you like to be able to drive and how hard do you want to work the engine. Look at the diameter of the tire sizes available in 19.5, vs a 20" tire. It's the reason I searched hard for useable 20" lock ring wheels. Picking at random, an 8r19.5 is 33 - 33.5", a 285/70/19.5 is 35". A 255/70r/22.5 is 36.7 (and requires a 7.5 or 8.25" wide rim). The 9.00-20's I picked up are 40" and are fine on a 6.5 or 7" rim (8.25-20's are roughly 38.5). This figures prominately with your gearing and desired engine rpm in setting your top speed. Here's a link with a calculator to play with the numbers:
http://www.csgnetwork.com/rpmcalc.html
And yes, there are other factors that have been discussed and need to be considered in a wheel decision; convenience of tubeless over tube and ease of mounting / safety issue. Safety is why I will not be using the perectly clean WM's that came with my truck.
One thing to consider when going to a 19.5 or even a 22.5 tubeless rim are tire sizes available, and what you want to do with the truck. How fast would you like to be able to drive and how hard do you want to work the engine. Look at the diameter of the tire sizes available in 19.5, vs a 20" tire. It's the reason I searched hard for useable 20" lock ring wheels. Picking at random, an 8r19.5 is 33 - 33.5", a 285/70/19.5 is 35". A 255/70r/22.5 is 36.7 (and requires a 7.5 or 8.25" wide rim). The 9.00-20's I picked up are 40" and are fine on a 6.5 or 7" rim (8.25-20's are roughly 38.5). This figures prominately with your gearing and desired engine rpm in setting your top speed. Here's a link with a calculator to play with the numbers:
http://www.csgnetwork.com/rpmcalc.html
And yes, there are other factors that have been discussed and need to be considered in a wheel decision; convenience of tubeless over tube and ease of mounting / safety issue. Safety is why I will not be using the perectly clean WM's that came with my truck.
#167
09-24-2009, 06:57 PM
Well, actually I just want to sustain 55mph safely. More in my wrecker thread.
#168
09-24-2009, 10:40 PM
Logistics Pro
Havi~
One thing to consider when going to a 19.5 or even a 22.5 tubeless rim are tire sizes available, and what you want to do with the truck. How fast would you like to be able to drive and how hard do you want to work the engine. Look at the diameter of the tire sizes available in 19.5, vs a 20" tire. It's the reason I searched hard for useable 20" lock ring wheels. Picking at random, an 8r19.5 is 33 - 33.5", a 285/70/19.5 is 35". A 255/70r/22.5 is 36.7 (and requires a 7.5 or 8.25" wide rim). The 9.00-20's I picked up are 40" and are fine on a 6.5 or 7" rim (8.25-20's are roughly 38.5). This figures prominately with your gearing and desired engine rpm in setting your top speed. Here's a link with a calculator to play with the numbers:
http://www.csgnetwork.com/rpmcalc.html
And yes, there are other factors that have been discussed and need to be considered in a wheel decision; convenience of tubeless over tube and ease of mounting / safety issue. Safety is why I will not be using the perectly clean WM's that came with my truck.
One thing to consider when going to a 19.5 or even a 22.5 tubeless rim are tire sizes available, and what you want to do with the truck. How fast would you like to be able to drive and how hard do you want to work the engine. Look at the diameter of the tire sizes available in 19.5, vs a 20" tire. It's the reason I searched hard for useable 20" lock ring wheels. Picking at random, an 8r19.5 is 33 - 33.5", a 285/70/19.5 is 35". A 255/70r/22.5 is 36.7 (and requires a 7.5 or 8.25" wide rim). The 9.00-20's I picked up are 40" and are fine on a 6.5 or 7" rim (8.25-20's are roughly 38.5). This figures prominately with your gearing and desired engine rpm in setting your top speed. Here's a link with a calculator to play with the numbers:
http://www.csgnetwork.com/rpmcalc.html
And yes, there are other factors that have been discussed and need to be considered in a wheel decision; convenience of tubeless over tube and ease of mounting / safety issue. Safety is why I will not be using the perectly clean WM's that came with my truck.
This is exactly why I went with the 9.00-20 TOYO radials on the front and 9.00-20 recapped radials on the back.
With my 5.83:1 --2 speed axle and my E4OD I should be able to do 70mph on the freeway and have my 292 only turn about 2400 RPM.
Just right!
You don't have to calculate what it'll be.........
With 40 inch dia tires, at 60mph, the rear wheel RPM will be 504.
Just multiply that times your rear axle ratio (and times OD if you have it) and you get engine RPM at 60mph.
Cheers,
Rick
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