I see many truck /camper type conversions that came with duellies changed to super singles (I think thats the term) better for plowing ect where can you get purchacing info on these tire rim combos.

 

I run Rickson 19.5's............they are rated for 6400 lbs that equivlant to a set of duels

 

How do you like the feel driving the 19.5s, are they the ones pictured in the snow

 

yes......I have the Goodyear G124 on there now, 265/19.5

They are a bit stiff but thats to be expected, they will get me over 100k miles outa them so they justify the cost easily, the heavy payload is why I bought em though

 

dose the extra weight of the tire rim combo affect milage and the feel of your gearing on the highway.

 

.....tricky question

The tire is 35" tall so yes it does effect gear ratio................I had 3:55 gearing and run the 6 speed manual so when cruzing empty my RPM is down compared to regular tires and also whn I tow heavy I run 5th gear and that keeps my RPM up and works very very well...............overall the weight of the tire rim combo is 172 lbs so they are very heavy but I see my milage still running 20-21 on a regular basis so the end result is the extra weight is compensated by the taller tire and its a wash in the end

 

May I help?
To calculate the ideal cruising speed you need:
- the max. torque and its speed example: 650ft.-lbsat 1600rpm
- tire diameter : 30"
- gear ratio of the highest gear : 0.71
- gear ratio of the rear end : 3.73
- constant to get rev's per hour : 336

ideal cruising speed =RPM x tire diameter/gear ratio x336

at our example: 1600 x 30/(.71 x 3.73 x 336)= 53.94mph

you can neglect tire weight, important is tire diameter

Remember: above 55mph areodynamic drag grows strong.

With that calculation you can calculate best efficency. By comparing stock and modification you can see if it is better or worse than the stock combo.

Hope this helps. Michael

 

excellent info Michael........thanks bro

 

Thank you, I use this formula a lot to get better mileage
I forgot to mention, since torque is maximum at this speed and rpm- towing performance is also best here.

 

You guys are too good.