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Thread: Super Singles on C4500?

  1. 02-27-2008, 09:43 #1
    Mark Rinker's Avatar
    Mark Rinker
    Mark Rinker is offline Enthusiast
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    Default Super Singles on C4500?

    Anyone have experience with Super Single drives on a C4500 Kodiak? I have seen a few trucks on the road, looking for feedback and information on rim/tire sizing.

    Would like to maintain load carrying capabilities as the truck is used to haul 100% of the time. Also would like to increase diameter by about 15% to lower cruise RPMs.

    Has the combination of reduced unsprung weight combined with increased diameter improved your fuel mileage? In this 8-9mpg (loaded) game, even 3-5% would be a great improvement!
    2011 Chevrolet Tahoe 5.3L daily driver
    • Previous owner of two 1994 6.5L K3500s, '01, '02, and '05 6.6L K2500s, '04 C4500, '06 K3500 dually, '06 K3500 SRW, '09 K3500HD SRW, '05 Denali
    • Total GM diesel miles to date : ~950K
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  2. 02-27-2008, 20:15 #2
    murphyslaw
    murphyslaw is offline Busting tires
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    What are you using this rig for. my concern with wide base tires on a 19.5 is they are hard to find, and would be very expensive to set up. a 19.5 rim for a wide base is gonna be around 4-500 each. and the tires them selves will be around 1000 each. not to mention if you are ever on the road and get a flat and ruin the tire or have a blow out, good luck finding a replacement. The next step up in the 19.5 tire is 245/75R19.5 That is the size I run on my 5500 service trucks and I love 'em, they ride better and look way better. I personally would never run a wide base(super single) on anything I had that ever left the city. you dont see any over the road rigs with supers on anything but a trailer.
    Last edited by Mark Rinker; 02-27-2008 at 22:15.
    Main rig-1978 chevy 3/4 f/t 4x4 8" lift 38 14.5 16 toyo m/t's. BUILT 350(soon to be 6.2) quad batteries. front and rear 15k winches. lockers F/R. dana60 front full float corp 14 rear. th400/np203.

    donor rig. 1988 GMC K3500 140k miles, th400. IFS(read CRAP) semi float 14 rear. drove it 142 miles home at 17mpg and 1/4 quart of delo 400.
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  3. 02-27-2008, 22:19 #3
    Mark Rinker's Avatar
    Mark Rinker
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    Hauling big boats cross country. I could carry a 'spare' 19.5 with stock rubber on the trailer. No truck spare on board at all today...makes me a little nervous when on the north side of Lake Superior, or crossing the reservations in New Mexico...

    How much larger is that tire diameter over stock, expressed as a percentage? I am looking for as much as 15% total reduction of engine RPM between wheel/tire and possibly even new rear gear selection. This 2300rpm BS at 65mph cruise wastes too much fuel...I need another gear!!!
    Last edited by Mark Rinker; 02-27-2008 at 22:42.
    2011 Chevrolet Tahoe 5.3L daily driver
    • Previous owner of two 1994 6.5L K3500s, '01, '02, and '05 6.6L K2500s, '04 C4500, '06 K3500 dually, '06 K3500 SRW, '09 K3500HD SRW, '05 Denali
    • Total GM diesel miles to date : ~950K
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  4. 02-27-2008, 22:59 #4
    murphyslaw
    murphyslaw is offline Busting tires
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    I will pull out the book and see what the overall size difference is.
    Main rig-1978 chevy 3/4 f/t 4x4 8" lift 38 14.5 16 toyo m/t's. BUILT 350(soon to be 6.2) quad batteries. front and rear 15k winches. lockers F/R. dana60 front full float corp 14 rear. th400/np203.

    donor rig. 1988 GMC K3500 140k miles, th400. IFS(read CRAP) semi float 14 rear. drove it 142 miles home at 17mpg and 1/4 quart of delo 400.
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  5. 02-28-2008, 00:46 #5
    DmaxMaverick's Avatar
    DmaxMaverick
    DmaxMaverick is offline Administrator
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    Mark, for the price of new tires/wheels, you could get real close to the Allison 6 speed upgrade. I'm not sure it would work, but it might. Could be worth looking into.
    1985 Blazer 6.2
    2001 GMC 2500HD D/A
    dmaxmaverick@thedieselpage.com
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  6. 02-28-2008, 11:02 #6
    murphyslaw
    murphyslaw is offline Busting tires
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    acording to my michelin book there 225/75R19.5's are 32.4" tall and the 245/75R19.5's are 33.6 so you are gaining right a bit over an inch. the 245/75R19.5's are also wider so you need to check your rim width. the aproved rim sizes for the 225 are 6-6.75" and for the 245 are 6.75-7.5. so make sure youre rim is wide enough to properly fit the 245/75R19.5 dont wanna see you have unexpected problems with this.
    Main rig-1978 chevy 3/4 f/t 4x4 8" lift 38 14.5 16 toyo m/t's. BUILT 350(soon to be 6.2) quad batteries. front and rear 15k winches. lockers F/R. dana60 front full float corp 14 rear. th400/np203.

    donor rig. 1988 GMC K3500 140k miles, th400. IFS(read CRAP) semi float 14 rear. drove it 142 miles home at 17mpg and 1/4 quart of delo 400.
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