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Taller tires and power, aka importance of gearing

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Taller tires and power, aka importance of gearing

 
  #1  
Old 11-18-2005, 09:31 PM
aurgathor
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Taller tires and power, aka importance of gearing

I just got some new, slightly taller tires today (LT245/75R16 vs. the old LT235/75R15) and to much of my surprise, the difference in power and acceleration is unmistakable and easily noticeable. I didn't expect a mere 1.7" or so difference in diameter to make that much of a difference in acceleration, but apparently it did. So I may need to regear sooner than later, though I have to see first what effect this will have on my mpg.
 
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Old 11-19-2005, 01:31 AM
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Welcome to the club of taller tire replacements.
 
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Old 11-19-2005, 01:02 PM
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also larger tires are heavier so that to must be taken into account. thats why we always say 33's = 4.10's and 35"s get 4.56 at least. if you have an od tranny you can get away with even lower gears.
 
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Old 11-19-2005, 05:19 PM
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What gearing do you have in the truck right now?
33s and 4.10s would make for some high RPMs with my 400 and C6 on the high way. For descent mileage and good perfomance 33s and 3.73s would be a good combination.
 
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Old 11-19-2005, 07:41 PM
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It's stock, 3.55LS. Since I have an E4OD, that can provide a somewhat lower RPM on highway.
As for weight difference, unless a tire is really big, i.e. 35"+ or so, I think that's negligible compared to the truck's weight.
 

Last edited by aurgathor; 11-19-2005 at 07:44 PM.
  #6  
Old 11-19-2005, 08:01 PM
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aurgathor, the tire weight is looked at a bit more closely moreover because its part of the unsprung weight and has more effect on the stress put on the axle/suspension components. Until you get into some of the much larger rubber, the added weight is as you say negligible.

MBB, 4.10's would be the max. for 33's with an auto that has no OD. But as Kem, said an OD tranny like the E4OD will allow you some more leaway by virtue of the OD gearing. I do agree that I would not necessarily like to run 33's with 4.10's on the highway for extended periods of time without the OD. But for some the torque is more important at the bottom end than the cruising speed. It just means your highway speeds would have to top out below the typical 65-70 mph that many drivers have become acustomed to.
 
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Old 11-19-2005, 08:17 PM
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I had a 94 bronco xlt 5.0 with 3.55's on it and switched to bfg all terrians 33x10.5s after about a year and loved them to death with only a slight diff in power but it was noticable but nothing that that truck couldn't handle
 
 
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