I'm just wondering what you guys are pulling, RPM-wise, at 55, 60, 65, 70, and 75mph. I'm not quite sure if my speedo is correct or not and need some other opinions.

BTW, I'm running 265's on the stock wheels.

Thanks:)

265's should actually keep it pretty accurate. with the predator that you have in your sig you can change the speedo to the correct one anyways.

I thought that might be the case. I bought it 2 weeks ago and while following my dad home, it was reading about 4-5mph slow on the interstate compared to our Jeep Liberty (he was going 80, mine read 75ish). Just a couple days ago, my girlfriend was riding with me around town and had her dad's GPS out. It was reading almost 100% accurate in town, but I didn't get the chance to get above 35 or 40.

Thanks

When I put 265 BFG KO's on, my speedo was dead on, verified by GPS. With stock 245's, off a few mph.

I thought that might be the case. I bought it 2 weeks ago and while following my dad home, it was reading about 4-5mph slow on the interstate compared to our Jeep Liberty (he was going 80, mine read 75ish). Just a couple days ago, my girlfriend was riding with me around town and had her dad's GPS out. It was reading almost 100% accurate in town, but I didn't get the chance to get above 35 or 40.

Thanks
im runin bf mud 265/75 on stock wheels and my speedo is off past 45ish with my gps till 47ish then at 65(on gps)the speedo is @58mph rpms @1800ish ,75mph(on gps)68ishmph on speedo ,rpms 2200ish ,122mph on gps 92on speedo 3200ish dont know if thats helps but i know mine is off bc at 75 on speedo im passing way to many ppl for just 75mph and 75on speedo is 2400ish,so i go off the gps,

go here and it'll help w/ all your ??

speed spreadsheet (http://www.dieselplace.com/forum/showthread.php?t=187516)

save it to your computer and it's easy to use or change.

BTW, I moved it over here.

Thanks, I didn't know where exactly I should put it since there seem to be plenty of different forums on here. I'll have to see how closely the RPM's match to my speed. I can't remember off-hand what speed I'm going at what RPM right now.

Thanks guys

73mph at approx. 200rpm 285's