Walt1967 Posted May 26, 2017 Share Posted May 26, 2017 Hi guys I have a problem.there is a nice Mack I want to buy but I think it's gonna be to slow.the truck is 1993 cl series with a 425 cat 13 speed rtlo14713 b.it has 4.42 rears.how fast will this truck go with 11r22.5,295.22.5 low pros,or 11r24.5 tires .the speedo is not working right now and it has the 295 22.5 low pros on it now.any info would be helpful thanks Quote Link to comment https://www.bigmacktrucks.com/topic/49972-engine-speed-and-tire-size/ Share on other sites More sharing options...
RedBullDog Posted May 26, 2017 Share Posted May 26, 2017 http://www.csgnetwork.com/rpmcalc.html Try that link, 11 r 24.5 tires should figure around 44 inch tall, 42 for lo 24.5s and 11 22.5. dont recall tire height for lowpro 22.5s. B designation means the OD is .75:1 IIRC. Just plug in your numbers and figure out where you want to be RPM wise. I run tall 24.5 rubber with 4.42 rears and run 65 to 70 comfortably. Quote Link to comment https://www.bigmacktrucks.com/topic/49972-engine-speed-and-tire-size/#findComment-370749 Share on other sites More sharing options...
Truck Shop Posted May 26, 2017 Share Posted May 26, 2017 Eaton road speed calculator http://www.roadranger.com/rr/CustomerSupport/Support/Calculators/index.htm Truck Shop Quote One ping only Link to comment https://www.bigmacktrucks.com/topic/49972-engine-speed-and-tire-size/#findComment-370750 Share on other sites More sharing options...
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