Bigger wheels = ???
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Elder User
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From: San Diego
Bigger wheels = ???
O.K. this may be a stupid question but I have been trying to figure this out and it's kicking my butt!
If you put bigger wheels/tires on without correcting for it, does that make your MPH read slower or faster? If it reads slower then effectivly you are logging less miles on the odometer than you are actually traveling, correct? But also effectivly showing lower MPG results, correct? So, by correcting for the larger wheels, you will get more accurate MPG and MPH readings but also, run up more miles on the odometer. Someone please confirm this or set me straight, it is boggling my mind right now!!! Thanks!
If you put bigger wheels/tires on without correcting for it, does that make your MPH read slower or faster? If it reads slower then effectivly you are logging less miles on the odometer than you are actually traveling, correct? But also effectivly showing lower MPG results, correct? So, by correcting for the larger wheels, you will get more accurate MPG and MPH readings but also, run up more miles on the odometer. Someone please confirm this or set me straight, it is boggling my mind right now!!! Thanks!
Last edited by Onespeed24; Jun 28, 2005 at 11:05 PM.
Lead Driver
Joined: Feb 2003
Posts: 8,140
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From: Oak Harbor, OH
If the tire size stays the same, then there is no effect. You actually have up to about a 3% margin before the speedo will not be correct. The way it works is the taller the tire slower the reading, the smaller the tire the faster the reading.
Posting Guru
Joined: Apr 2005
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From: covington wa.
well i had it backwards. How would that relate to rpms and fuel
mileage. meaning if im actually going slower are the rpms down
also thus saving fuel?? need some schoolin. and being a gemini
i tend to over analize then confuse myself silly.
mileage. meaning if im actually going slower are the rpms down
also thus saving fuel?? need some schoolin. and being a gemini
i tend to over analize then confuse myself silly.
Hotshot
Joined: Jun 2003
Posts: 12,353
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From: SW VA
If you install larger tires without changing your axle gear ratios, then your RPM's will be lower. However, there will be extra strain on your transmission/clutch, and you will notice a big difference in power depending on the size of the tires.
As for the saving fuel part...your engine has to work harder to turn those larger tires, so fuel will either stay about the same or drop considerably depending on the size of the tires.
Now, if you put a lower (numerically higher) gear set in your axles, then you can bring your RPM's back up to where they would be close to stock. This will also help reduce the strain on the tranny/clutch. You will also regain that "lost" horsepower and torque.
As for the saving fuel part...your engine has to work harder to turn those larger tires, so fuel will either stay about the same or drop considerably depending on the size of the tires.
Now, if you put a lower (numerically higher) gear set in your axles, then you can bring your RPM's back up to where they would be close to stock. This will also help reduce the strain on the tranny/clutch. You will also regain that "lost" horsepower and torque.
Last edited by ATC Crazy; Jun 29, 2005 at 12:35 PM.
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speedo reads 55 but im actually going about 65-70. my rpm's hang around 1700 going about 70. as far as the power part, thats why i got a diesel, it isnt as bad of a power loss but im in the process of chipping it etc etc so ill have much more power, can never have too much of that.
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From: covington wa.
We robbed this conversation from onespeed24. anyhow i have a
89' F250 460 c6 stock tires i believe were 265-75-16 with my
lift im going to 315-75-16 what would be a good gear axle ratio?
I have no idea as to what i have now. and can you do it yourself?
I want the best fuel mileage, but also dont want low power.
89' F250 460 c6 stock tires i believe were 265-75-16 with my
lift im going to 315-75-16 what would be a good gear axle ratio?
I have no idea as to what i have now. and can you do it yourself?
I want the best fuel mileage, but also dont want low power.
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Elder User
Joined: Jun 2005
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From: San Diego
No biggie! It's all about the same subject. As far as doing the gears yourself, that's a tough job. Not so much physically, but you gotta get the backlash just right or it will whine or gnash your gears up really quick. Best to let a pro handle stuff like that.