Tire Question
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New User
Joined: Feb 2008
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Tire Question
Just came across a deal for (2) BFG 35"/12.5/16.5 Mud Terrains 90% tread and (3) General Grabber Mud Terrains 35"/12.5/16.5 with 75% tread.. $350 for all... is this a good deal? Is there a considerable difference in General M/T's and BFG M/T's that I shouldn't run both kinds of tires on my truck?
Elder User
Joined: May 2003
Posts: 818
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From: Mobile, AL
What am I missing here they are both 35/12.5/16.5s right. Short of the wear of the BFGs vs the Generals being a estimated 15% wear difference which equals @ .1" difference. If you are worried about it stay off the dry pavement in 4X4. If you need tires I say go for it, it's not like you are running 33"s and 35"s.
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Post Fiend
Joined: May 2006
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From: Central Florida
Just because they are labeled as 315 whatever, manufacture tolerances are well over 10% in some cases. You could have a full 1" difference between any two manufactures and I wouldn't be surprised if you measured a 1/4" difference from the same manufacture and batch and 1/2" difference in different batches.
Elder User
Joined: May 2003
Posts: 818
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From: Mobile, AL
Just because they are labeled as 315 whatever, manufacture tolerances are well over 10% in some cases. You could have a full 1" difference between any two manufactures and I wouldn't be surprised if you measured a 1/4" difference from the same manufacture and batch and 1/2" difference in different batches.
Post Fiend
Joined: May 2006
Posts: 10,007
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From: Central Florida
A 35" diameter tire is 109.9 or 9.15ft in circumference and 577 revolutions per mile. A 34" tire is 106.7 or 8.89 ft and 593 revolutions per mile. So for every mile traveled 1" makes a difference of 16 revolutions per mile. So the smaller tire has to skip 142.2 ft because they are both revolving at the same rate but the larger tire goes further per rev. Sure it's only 2.5%, but 142ft is still quite a bit of lost traction.
Elder User
Joined: May 2003
Posts: 818
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From: Mobile, AL
I was off by .1" on my estimate darn... I'd do it, you can have that much difference with the same brand and a lapsed rotation. Though I am sure some one will say otherwise. You don't want to be in 4X4 in the situations that this would matter anyways.
Postmaster
Joined: Jan 2005
Posts: 4,743
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From: Peoria, IL
I say it depends on how he drives his truck, I know I personally wouldn't have an issue with this. The only time I have my truck in 4x4 is when I am off road, or when the roads are really bad. If the roads aren't too bad I usually just use 4x4 to get going from a stop and then shift back into 2 wheel drive. I don't drive more than a few hundred feet, so the little bit of difference in ratio won't matter.
Also, I was thinking that there was already a tiny bit of difference in the gear ratios as it is. I though i remember reading that if you have the 3:73 rear gears your front gears are actually 3.72:1 or something like that. This was because they are from two different manufacturers (Sterling and Dana). I could be totally mistaken on this though.
Also, I was thinking that there was already a tiny bit of difference in the gear ratios as it is. I though i remember reading that if you have the 3:73 rear gears your front gears are actually 3.72:1 or something like that. This was because they are from two different manufacturers (Sterling and Dana). I could be totally mistaken on this though.