Tires for a 68 1100C

Discussion in 'General IH Tech' started by TheCrazyFarmer, Sep 24, 2019.


  1. Bill Bennett

    Bill Bennett High Wheeler

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    This 4x4 does have the stock 2 1/2" 'lift' blocks plus the extra 3/4" overload leaf, for the rear axles from the factory. The front springs were 're-arched' and one extra leaf was added about 1975 because the springs had sagged so much it was bottoming out too easily. Otherwise, no extra lift and the body has not been lifted either.
     
  2. TheCrazyFarmer

    TheCrazyFarmer Binder Driver

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    Will do that in the morning, thanks!:cowboy::thumbs up:
     
  3. Gunfighter97

    Gunfighter97 Farmall Cub

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    No prob. These trucks do sit surprisingly tall with 4x4, mine has the original HD 1100 front springs, standard rear with 1200 helpers; basically stock stance with 1.5" body lift(IMO for most practical offroading it doesnt need any more, body lift kinda helps with fender clearance although its proving to be more trouble than its worth in regards to side effects like how bowed my unsupported bed floor is)

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  4. TheCrazyFarmer

    TheCrazyFarmer Binder Driver

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    Does anyone know what kind of a change I would see if any, going from 27s to 32s? Will it make much difference?

    I am not doing anything crazy with this truck, just a little more clearance would be nice.
     
  5. mallen

    mallen High Wheeler

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    Should be considerable. That's 2.5" extra. If they fit. You will need to change the drive gear on the tranny to make the speedeter read right. Unless the tires are free, I'd save that for after you have we verythingbelse running right though.
     
  6. jeff campbell

    jeff campbell Lives in an IH Dealership

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    20190912_100219.jpg 20190917_125803.jpg 20190912_100139.jpg Went from 7:50-16 to 9:00-16" on 72-1210. Not sure on height yet, not measured it. It did raise it a bit and threw speedo of 10-11 mph slower.
     
  7. Gringo Gomez

    Gringo Gomez Farmall Cub

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  8. Jeff Jamison

    Jeff Jamison Lives in an IH Dealership

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  9. jeff campbell

    jeff campbell Lives in an IH Dealership

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    Only so many hours in the day jeffrey !
     
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  10. Gunfighter97

    Gunfighter97 Farmall Cub

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    Can confirm, tires drastically effect the speedo(like A LOT more than you might think). Mine reads 50 at 65mph.

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  11. TheCrazyFarmer

    TheCrazyFarmer Binder Driver

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    What kind of process would I have to go through to get the speedometer right? Or do I just leave it, and make note of how fast I'm really going?
     
  12. Gunfighter97

    Gunfighter97 Farmall Cub

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    The easiest way would be to get the correction gear box from IHPA, you send in your gps speed and the speed on the speedometer and they make a small gear box that mounts in the dash on the back of the speedo where the cable attaches. The cable then attaches to the box. OR take apart your transmission and hope you find the right worm gear to swap in.

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  13. kdsmit

    kdsmit Farmall Cub

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    Ok, my 1960, B120, 2wd has 7.50 - 16 tires on it and they do not rub. 7.50 -16's are 31 inches tall. They are bias, not radial. They are also the 5 bolt rim, I assume that they are the same bolt pattern as yours. If you do a search online there are tire size converters, so you can find a radial that is similar, if you want radials. I have a gear ratio converter on my computer at work, that I can post tomorrow. There is also a handy converter on the Summit racing web-site in the tire section.
     
  14. Gunfighter97

    Gunfighter97 Farmall Cub

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    Note above, thats the one where i got my wheels not speedway. Also correct me if im wrong, dont the b series share the same cab? Or am I thinking of a different model? If so I would assume the frames are also very similar as well.

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  15. TheCrazyFarmer

    TheCrazyFarmer Binder Driver

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    I don't understand how to read tire sizes, so what do I search for if I want tires that are about 8" wide, 31" or 32" tall, for a 15" or 16" rim?

    I also want it to be okay in the mud, when the rains come this fall. I don't really plan on driving this thing in the snow.

    Thanks!
     
  16. kdsmit

    kdsmit Farmall Cub

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    I think that they call the tire height, the aspect ratio. The 7.50 - 16's do come in a mud/snow lug.
    The gear ratio calculator that I was talking about is a simple formula. New tire diameter divided by old tire diameter X old gear ratio = new gear ratio. So on my C120, I want to switch from 7.50 - 16's (31" tall) to 9.00 - 16's (36.1" tall). 31 divided by 36.1=0.858, 0.858 times 4.10 (my gear ratio) =3.52.
    By increasing the tire height, you take away some of the gearing advantage, but will also decrease your cruising RPM, so it could increase your gas mileage a bit. I would say, that you kind of know what you want, tell your tire guy this and he can walk you through it.
     
  17. TheCrazyFarmer

    TheCrazyFarmer Binder Driver

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    You just spoke a different language to me!

    You said all kinds of mathy things.:cornfused:
     
  18. Bill Bennett

    Bill Bennett High Wheeler

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    Going with taller tires = like a 31" diameter, will also require more effort to get the truck stopped quickly. Acceleration will be a bit slower and pulling a hill will require more throttle or possibly 'downshifting'. Basically like changing the final drive gear from a 4.09 to a 3.3 gear.
     
  19. TheCrazyFarmer

    TheCrazyFarmer Binder Driver

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    I that's what kdsmit was talking about. You just dumbed it down a bit, and now I understand.

    I automatically start getting confused when anyone starts talking about gear ratios, and a bunch of numbers. I'll get there eventually, but until then, its helpfull when people simplify it for me.

    Thanks!
     
  20. TheCrazyFarmer

    TheCrazyFarmer Binder Driver

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    Here's my LST!

    It looks like a different tire sizing system? What size tires are the ones on my LST?

    Thanks!
     

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