Pirate 4x4 banner

1 - 20 of 29 Posts

·
Registered
Joined
·
2,564 Posts
Discussion Starter #1
OK, heres the deal. My brother and I bet a case of Sierra Nevada that 5.29's with 35's or 33's bring the gearing back down to about what stock would be. So is it 33's or 35's? Thanks. <IMG SRC="smilies/beer.gif" border="0"> <IMG SRC="smilies/beer.gif" border="0"> <IMG SRC="smilies/beer.gif" border="0">

[ 09-07-2001: Message edited by: Disco ]
 

·
Registered
Joined
·
1,181 Posts
i say 35's,

DSI says he had 33's and his speedo was 7 fast and with 35's its pretty much dead on.
but he is <IMG SRC="smilies/rainbow.gif" border="0">
 

·
Super Moderator
'82 Scrambler, '14 Rzr
Joined
·
62,007 Posts
33's - 4.88's
35's - 5.29's
 

·
Registered
Joined
·
2,560 Posts
The greatest part is that this whole debate can be settled with (are you ready...) MATH!

Stock gears varied, but 4.10s were the most common. Likewise tire sizes varied, but we'll use the common 235/75R15, which is 29 inches tall. Now you take 29/4.10 = 7.07. Now take that number and multiply is by your 5.29s and you get... 37!

Of course this doesn't take into account additional weight or rolling resistance, but math can still be fun. <IMG SRC="smilies/tongue.gif" border="0">
 

·
Registered
Joined
·
2,564 Posts
Discussion Starter #8
I just have to convince my brother that I'm right. I think I need Seans opinion.

DRM: I'll agree with you since it gets me a case. <IMG SRC="smilies/biggrin.gif" border="0"> <IMG SRC="smilies/biggrin.gif" border="0"> <IMG SRC="smilies/biggrin.gif" border="0">
 

·
Registered
Joined
·
2,560 Posts
Originally posted by Disco:
<STRONG>I just have to convince my brother that I'm right. I think I need Seans opinion.
</STRONG>
Just out of curiosity, what does your bro say Disco? Does he think that 5.29s are too low, or not low enough to bring it back to stock?
 

·
Registered
Joined
·
1,232 Posts
Originally posted by Dirty Harry:
<STRONG>The greatest part is that this whole debate can be settled with (are you ready...) MATH!

Stock gears varied, but 4.10s were the most common. Likewise tire sizes varied, but we'll use the common 235/75R15, which is 29 inches tall. Now you take 29/4.10 = 7.07. Now take that number and multiply is by your 5.29s and you get... 37!

Of course this doesn't take into account additional weight or rolling resistance, but math can still be fun. <IMG SRC="smilies/tongue.gif" border="0"></STRONG>
What is the rolling radius of a 29 inch tall tire compared to the 37 inch tall tire. The gears see the rolling radius not the diameter.

Also the stament was made that "the gearing back down to about what stock would be". Is this the speedometer reading or the engine torque required to move the vehicle. The gearing to bring the speedometer back to correct will still require much more torque to move the vehicle as well as to keep it moving.

The extra rolling resistance of the tires, the extra wind resistance from the lift and larger tires, the extra squirm from the larger tires all take more torque. I have 35's with 4.88. This is not low enough. I am into 3rd and 4th gear alot going up 50 to the con. A friend I wheel with has 33's with 4.88's and he is 200 to 300 RPM higher than I am as well as one gear higher in the hills. If I'm in 3rd, he is in 4th. If I had a choice with 35's, I'd run 5.71's. Too bad they break too easy in realtion to 5.29's

Just my .02. Do what you want with it.
 

·
Registered
Joined
·
2,564 Posts
Discussion Starter #11
Originally posted by Dirty Harry:
<STRONG>Just out of curiosity, what does your bro say Disco? Does he think that 5.29s are too low, or not low enough to bring it back to stock?</STRONG>
He say's 33's and 5.29's.
 

·
Registered
Joined
·
2,560 Posts
Originally posted by incontrol:
<STRONG>What is the rolling radius of a 29 inch tall tire compared to the 37 inch tall tire. The gears see the rolling radius not the diameter.
</STRONG>
Grrr... James knows more about math than me. <IMG SRC="smilies/mad.gif" border="0"> Aw hell, just go to 4lo.com.
 

·
Registered
Joined
·
1,464 Posts
new 35" bfg m/t at 24 psi at 5000' elevetion
indicated 65mph on speedo, construction site radar shows 61mph. had the wife set the cruz on the '99 runner at 65, the truck shows 59 to 61mph. thats pretty close to 6.5% under geared
 

·
Registered
Joined
·
1,988 Posts
Stock tires with 4.10's were 225/75R15 which are about 28". Stock with 4.56's were 31". They both come out about 36" with 5.29's.

x=5.29*(28/4.10) x=36.13
x=5.29*(31/4.56) x=35.96

But that don't account for weight, rolling resistance, wind resistance, etc.
 

·
Registered
Joined
·
1,024 Posts
35's, 35's, 35's <IMG SRC="smilies/biggrin.gif" border="0"> <IMG SRC="smilies/biggrin.gif" border="0"> I have an electric speedo on my rear diff so it automatically reads the correct speed ( had a cop check for me). But when my rig had 31's (stock), I wrote down the rpm at 60 mph. Then when I jumped to 33's I wrote down the number (way off). And finally with 35's, the rpm reads as it did with stock 31's. <IMG SRC="smilies/bounce.gif" border="0">
 

·
Registered
Joined
·
34,267 Posts
easy answer 5.29's, now about 5.71's, I ran them with 33's 35's 36's and 38.5 x16x15TSL's and lockrights F & R, did the con 10 times, not one broken birfield, as most know me and DRM have never broke a birf <IMG SRC="smilies/wink.gif" border="0"> No broken 5.71's either, so weak......maybe, but I had no trouble, would I recomend 5.71's to anyone......uh NO, people drive to differently to say they won't break <IMG SRC="smilies/wink.gif" border="0">
 

·
Registered
Joined
·
3,402 Posts
I run 4:88's and 36's and speedo is slow by 15 mph. It's a dawg on the highway too. I do have a fresh 22r, so it's not too bad. I'd say 5:29's and 35's are a good match for correct speedo calibration.
 

·
Registered
Joined
·
3,010 Posts
mt-toy

where do you live?

i'm here in billings!

where do you wheel? <IMG SRC="smilies/biggrin.gif" border="0">
 
1 - 20 of 29 Posts
Top