I have a 99 Dodge Ram 1500 Quad cab 5.9L and the original tires are listed on the tag is 225/ 75 /R16xl and the tires that are on it right now 245 /75 /R16 and that makes my speedometer is already 4 mph slower than I am actually going, so my question is how bad would my Speedometer be off if I put on 265 /70 /R17 tires and rims on this truck ? I don't think there would be any clearance problems putting these tires and rims on my truck.


Thanks for any help you can come up with

 

I have 265/70/17 on my 2wd, up from 245/x/16 (can't remember), I think I'm around 5mph faster than speedo at certain speeds, been awhile since I paid enough attention.

 

Get your build sheet, (link to form in faq section.) What the tag says, and what the build sheet says, are sometimes two entirely different things. Believe the build sheet.

Welcome to DF!

 

I think my door sticker shows 225/x/16 as well. I'm willing to bet 245/x/16 was a normal size though...

From my build sheet:

TYV P245/75R16 OWL All Season Tires

 

My truck had a perfect speedo reading with 245/75 R16s when I went to 265/70 R17s it made my speedo 5mph slower.

So I'm guessing if you have 245/75 R16s and it's already 4mph slower I'd say it might be close to 9-10mph slower.

 

I have 265/75/R16's on my 98 1500 and compared it to a traffic speed signal and my gps, it makes the speedometer exactly 5 mph slower in all speeds. If you have a smart phone download one of the speedometer apps to help verify your speedometer. I have to remind myself to go slower to avoid those pesky tickets!

 

If your speedo is 5 mph slower than actual, your already under the speed limit.....

 

^ If the speedo is 5mph slower than actual, he's doing 65 when his speedo says he's doing 60....

 

Yeah, I meant he can say he was doing under the speed limit to the cop.....

 

225s are awful small tires for these trucks. I'm not sure I've seen any around with that size