tire size .vs. gear ratio

[bike-maker]

When doing calculations, keep in mind the ACTUAL tire size.
My 35" BFG's are actually 34"
The military 37's are actually somewhere around 35 1/2"
So the difference between the 2 isn't as much as it seems.

Edit: looks like Bob beat me to it

 

[dizdak]

thanks guys, i got the springs on tonight.. i am thinking my springs are 4" cause now the front only sits about in inch higher than the rear.. probably end up going with the 35s range..

 

[riotwarrior]

thanks guys, i got the springs on tonight.. i am thinking my springs are 4" cause now the front only sits about in inch higher than the rear.. probably end up going with the 35s range..

THIS THREAD IS USELESS WITHOUT PICS

just sayin....

 

[dizdak]

i will get a picture up of the new stance..

 

[dizdak]

anyone know why my avatar doesn't show anymore? i tried to update it and now nothing shows

 

[racin460]

(ACTUAL) tire size is found by measuring the circumference and divide by pie (3.14)

 

[GOOSE]

I'm running 285-75-16's and wouldn't mind 4:56 gears for towing. I know most guys like getting the rpm's down for fuel economy but these trucks really need gear to tow. 4:56's and a brownie would be optimal.

 

[mblaney]

anyone know why my avatar doesn't show anymore? i tried to update it and now nothing shows

Probably because you spilled the beans and said it was a pic of a Toyota - this is a real truck forum, you have been moderated???

 

[dizdak]

lol.. fortunately the only thing left toyota is the cab and bed, the rest is custom frame, military rockwell axles, transfer case, big block chevy, and a slew of other goodies..

 

[riotwarrior]

lol.. fortunately the only thing left toyota is the cab and bed, the rest is custom frame, military rockwell axles, transfer case, big block chevy, and a slew of other goodies..

Who ever said a BBC was a goodie...this is an IDI forum here not BBC

 

[dizdak]

true true, but my IDI gets the toy where it needs to be thats the important part!!

 

[jaluhn83]

I'm running 33x12.50r16.5s on my rig with no lift and they fit pretty good.

Remember those military tires are 16.5s and they may be bias ply. 16.5s are getting to be harder to come by so you'd be limiting you're options without changing the rims. Not a big deal, just food for thought.

I've got 3.55s in my rig and they work decently. I'd like to move to a 3.73 but 3.55 works. Granted I've got a turbo so the powerband is a bit different. I tow ~6k commonly and up to ~10+ rarely.

Personally I like the lower ratio to get cruise rpms down. With my setup I'm running ~2100 rpm at 70 in 5th which is a good unloaded truck speed/rpm combo - I dislike running at higher rpm and feel 18-2100 is about optimal for power and economy. For towing I'm usually in 4th doing ~2300 rpm at 55-60 which is also a pretty good combo.

 

[dizdak]

my truck is also factory turbo'd with 3.55s.. but with bgger tires, an hauing the heavier loads on a semi-regulare basis i think 35s and 4.56s may be good..