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Author: Subject: 18 inch vs 20 inch rims
BajaParrothead
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[*] posted on 9-20-2019 at 12:42 PM




"My new Ford came with 18s and I and too cheap to switch to 17s. If I would switch to 17s I would try to keep the tire the same diameter to avoid new gearing."
=== === =

I found on my 2019 Ram that they went to a 20" wheel to accommodate the larger brake rotors and calipers. Even if I wanted to go down to a 16" or 17", I can't.





[Edited on 9-19-2019 by JZ][/rquote][/rquote]
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[*] posted on 9-20-2019 at 01:17 PM


Quote: Originally posted by PaulW  

My new Ford came with 18s and I and too cheap to switch to 17s. If I would switch to 17s I would try to keep the tire the same diameter to avoid new gearing.


when i bought my new F-150 a couple years ago, wheel size was an option, and I wanted 17" for better ride quality on rough roads and offroad, and was pleased that 17" was cheapest option of available wheels.

the trend of large rims on full size pickups is a fad that for shallow posers. if that fad of blingy wheels is your thing, why are you buying a pickup?




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matthew_mangus
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[*] posted on 10-4-2019 at 08:12 PM


I've learned over the years (often the hard way) that going big is for rookies and posers. I'm now trending the other way and going just large enough to get the job done. My primary rig ( I have 4 ) is running 285/75/17s and I'll likely downsize again to 70s the next time I buy tires.

I also have learned to be critical of tire / wheel sizes when other rigs are joining in on an adventure. A Range Rover sport w/ turbo on 20's w/ a Brembo big brake kit may be miles ahead of the convoy when on pavement, but then falls way behind and becomes a liability when we are aired down and he doesn't have enough sidewall to be able to float over the rocks. I have two friends who have been politely notified that they are no longer welcome on trips where we typically air down.
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[*] posted on 10-5-2019 at 08:17 AM


Quote: Originally posted by matthew_mangus  
I've learned over the years (often the hard way) that going big is for rookies and posers. I'm now trending the other way and going just large enough to get the job done. My primary rig ( I have 4 ) is running 285/75/17s and I'll likely downsize again to 70s the next time I buy tires.

I also have learned to be critical of tire / wheel sizes when other rigs are joining in on an adventure. A Range Rover sport w/ turbo on 20's w/ a Brembo big brake kit may be miles ahead of the convoy when on pavement, but then falls way behind and becomes a liability when we are aired down and he doesn't have enough sidewall to be able to float over the rocks. I have two friends who have been politely notified that they are no longer welcome on trips where we typically air down.


Man, that's awesome! I would like to wheel with you! ;D




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[*] posted on 10-5-2019 at 09:48 AM


"My primary rig ( I have 4 ) is running 285/75/17s and I'll likely downsize again to 70s the next time I buy tires. "

My choice would be to stick with the 75 aspect, and lose some width. A 265/75 aired down should have plenty of surface area for flotation, and would be a better handling tire on the road, especially wet roads!




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[*] posted on 10-5-2019 at 05:34 PM


My recently purchased 2006 Toyota 4Runner has 18 inch rims. I tried to put one of my 04 Tacoma 16 inch rim on and it was too small.It would go on but not rotate, locked against the rotor. In 2006 Toyota made three versions of the 4Runner two with 16 inch rims and the Limited with 18 inch. I haven't decide how much I'll do to it for off road That's why I have my Tacoma. I think I'll put rock slider on it and get rid of the goofy step board.
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[*] posted on 10-5-2019 at 11:12 PM


I have 35"x12.5r15s on the little Jeep.
Currently, LT285 17's on the Jeep (Gladiator) truck.
Next size up for the Gladiator JT is either 37" or 38"
A 2". Daystar spacer lift is sitting in the garage :bounce:
Aftermarket 17x8" (beadlocks) wheels are part of the plan.
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PaulW
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[*] posted on 10-6-2019 at 05:46 AM


Check into using a spacer. It is a common solution to caliper to wheel interference. If you go that way be sure you do not cheap out. Buy a quality spacer. Your vehicle specific forums will guide you.

Quote: Originally posted by TMW  
My recently purchased 2006 Toyota 4Runner has 18 inch rims. I tried to put one of my 04 Tacoma 16 inch rim on and it was too small.It would go on but not rotate, locked against the rotor. In 2006 Toyota made three versions of the 4Runner two with 16 inch rims and the Limited with 18 inch. I haven't decide how much I'll do to it for off road That's why I have my Tacoma. I think I'll put rock slider on it and get rid of the goofy step board.
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[*] posted on 10-6-2019 at 11:07 AM


Thanks Paul, I never considered that.
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matthew_mangus
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[*] posted on 10-6-2019 at 10:54 PM


Quote: Originally posted by David K  


Man, that's awesome! I would like to wheel with you! ;D


Hmmm, I dunno. After your latest adventures in Raptors, we'd probably be pretty boring to you. :lol:
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[*] posted on 10-7-2019 at 09:47 AM


Nope, I respect your four-wheeling style. I love going to places in low range and where lockers or traction control gets you there safely with minimal body damage.
The road to Mission Santa María is a favorite trip of mine as it combines many things that make Baja special for me. Riding in a Raptor driven by Curt LeDuc or Cameron Steele is fun but not the way I normally drive in Baja (in my Off-Road TRD Tacoma 4x4).




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[*] posted on 10-7-2019 at 07:18 PM


Quote: Originally posted by David K  
Nope, I respect your four-wheeling style. I love going to places in low range and where lockers or traction control gets you there safely with minimal body damage.
The road to Mission Santa María is a favorite trip of mine as it combines many things that make Baja special for me. Riding in a Raptor driven by Curt LeDuc or Cameron Steele is fun but not the way I normally drive in Baja (in my Off-Road TRD Tacoma 4x4).


Right on. I'll have to coordinate an adventure with you some time.

Is the Mision de Santa Maria accessed via the dirt track that starts in the NW corner of the Ranch Santa Ynes airstrip? Also, do you reach the Oasis Santa Maria by following the same track until it eventually disssapears in the riverbed?
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[*] posted on 10-13-2019 at 07:59 AM


My 05 F-250 has 18s. True, not a big choice of tires in that size rim. But I've settled on Nitto Trail Grappler M/Ts on LT285x75x18. I'd prefer 17s but have been too cheap to replace the wheels/tires and I like to look of the factory 18s. The 285s are pretty close to 35".
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[*] posted on 10-13-2019 at 09:17 AM


Doug. That tire is almost exactly a 34" diameter tire @ 592 rev/mile
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[*] posted on 10-13-2019 at 09:40 AM


Quote: Originally posted by matthew_mangus  
Quote: Originally posted by David K  
Nope, I respect your four-wheeling style. I love going to places in low range and where lockers or traction control gets you there safely with minimal body damage.
The road to Mission Santa María is a favorite trip of mine as it combines many things that make Baja special for me. Riding in a Raptor driven by Curt LeDuc or Cameron Steele is fun but not the way I normally drive in Baja (in my Off-Road TRD Tacoma 4x4).


Right on. I'll have to coordinate an adventure with you some time.

Is the Mision de Santa Maria accessed via the dirt track that starts in the NW corner of the Ranch Santa Ynes airstrip? Also, do you reach the Oasis Santa Maria by following the same track until it eventually disssapears in the riverbed?


The road to the mission begins at the far left gate (as seen when driving to the ranch from Hwy. 1) from the old restaurant/ ranch of Santa Ynez... the opposite side from the airport. See it on Google Earth.

There are two oasis locations associated with Santa María, perhaps three:

a) The first palms you drive through, below the 'widowmaker' grade, about 1 mile before the mission.

b) The oasis we camped next to in 2007 is a mile past the mission and then back up the arroyo from the road. This is where the bighorn sheep visited us.

c) The "La Poza de Escuadra" as some have called it which is in the canyon maybe 3 miles beyond the mission... a long, steep hike is required to the end of the bulldozed road, then down into the canyon on the Indian Trail (El Camino Real before 1768, replaced by a new route on the north rim of the canyon). This is the oasis on my map...



Here are my last two trip webpages, to the mission. The 2007 one contains a road log:

2007: http://vivabaja.com/msm/
2010: http://vivabaja.com/msm2010/


ROAD LOG
0.0 Rancho Santa Ynez, take road through left gate, north of ranch.
0.9 FORK, go left/ uphill.
1.8 Deep Gully, 4WD climb out (if this scares you, go back!).
2.4 Rock pile, a road to left, go straight/ right fork.
4.7 Cement monument off to left (tracks continue past monument).
5.6 Arroyo crossing with palms.
9.9 Peninsular Divide, view of Punta Final on the gulf.
13.3 Top of the 'Widowmaker' grade.
14.4 MISION SANTA MARIA
15.4 Road enters sandy Arroyo Santa Maria, after very steep downgrade. (Bighorn oasis to the left)
15.7 Turn left, out of arroyo (may be hidden by plants). Tracks ahead in arroyo end in 1/4 mile.
15.9 El Camino Real climbs to the left, up hillside. The mission trail stays out of the canyon, along the north ridge and returns to the arroyo at the east end of the canyon.
16.0 Roadbed washed out. Park and hike on to end of bulldozed grade to see petroglyphs, canyon view, Indian trail to canyon bottom.





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[*] posted on 10-13-2019 at 10:53 AM


Quote: Originally posted by PaulW  
Doug. That tire is almost exactly a 34" diameter tire @ 592 rev/mile


It's almost 35. 34.83.




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[*] posted on 10-13-2019 at 08:55 PM


Details, details. :-)
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[*] posted on 10-13-2019 at 09:12 PM


Quote: Originally posted by JZ  
Quote: Originally posted by PaulW  
Doug. That tire is almost exactly a 34" diameter tire @ 592 rev/mile


It's almost 35. 34.83.


35.08”




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[*] posted on 10-13-2019 at 09:19 PM


Quote: Originally posted by mtgoat666  


35.08”


Your calculator is no bueno.




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[*] posted on 10-14-2019 at 07:50 AM


For those failing math education or forgetting how to do the math
Tire diameter = 63360/(pi*RPM)
Or 63360/(3.1416 * 592)=34.07”
Here is the derivation 5280(12)/Pi(RPM)=diameter in inches
Pi = 3.1416 and RPM is manufacturers rev per mile.
For better understanding go read
https://sciencing.com/calculate-tire-turns-per-mile-7797454....

What you get from various tables from the web just ignore because they are just approximations.

You might want to know that using the science and correct math when I adjusted my speedo via the ECU I used the math above and got exact MPH on my speedo. Math and science never fails.



[Edited on 10-14-2019 by PaulW]
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