| Pages:
1
2 |
Santiago
Ultra Nomad
Posts: 3512
Registered: 8-27-2003
Member Is Offline
|
|
Airing down w/ 20" rims
New trucks seem to come with 20" rims now, anyone have issues airing down with them?
|
|
|
bkbend
Senior Nomad
Posts: 693
Registered: 11-27-2003
Location: central OR or central baja
Member Is Offline
|
|
I'm not a tire guy but I would think it's more the profile of the tire and not the wheel size. I've stopped to help more than one car driver with
sporty low profile tires who had just slammed into a pothole and bent a rim. If you air down you need to maintain some distance between the rims and
the ground. My truck came stock with 70 profile tires and I switched out to 75 profile to add a wee bit of clearance when I air down.
|
|
|
John Harper
Super Nomad
Posts: 2289
Registered: 3-9-2017
Location: SoCal
Member Is Offline
|
|
Yes, I would think the aspect ratio of the individual tire would have some to do with it. 50 series on a 20" rim seems problematic on dirt roads.
John
|
|
|
advrider
Super Nomad
Posts: 1863
Registered: 10-2-2015
Member Is Offline
|
|
I agree with both of the above, I wouldn't do any offroading or airing down with a 50 series. A truck tire on a 20 should not be a problem..
|
|
|
David K
Honored Nomad
Posts: 64857
Registered: 8-30-2002
Location: San Diego County
Member Is Offline
Mood: Have Baja Fever
|
|
No bling in Baja!
|
|
|
BajaTed
Senior Nomad
Posts: 859
Registered: 5-2-2010
Location: Bajamar
Member Is Offline
|
|
Modern cars with 20 inch wheels give tires a larger contact profile to the roadway, great for improved driving on the street, but not good for off
road at all due to the lack of tire sidewall height.
Es Todo Bueno
|
|
|
bajatrailrider
Super Nomad
Posts: 2432
Registered: 1-24-2015
Location: Mexico
Member Is Offline
Mood: Happy
|
|
All info correct . For me 20in rims off road beat you up. Now if you have tall sidewalls it will work ok.
|
|
|
willardguy
Elite Nomad
Posts: 6451
Registered: 9-19-2009
Member Is Offline
|
|
half tire wheel rule.......got 40's?
|
|
|
norte
Super Nomad
Posts: 1163
Registered: 10-8-2008
Member Is Offline
|
|
Its not the wheel that is the issue...Its the tire. modern low profile TIRES are problematic when airing down.
|
|
|
4x4abc
Ultra Nomad
Posts: 4290
Registered: 4-24-2009
Location: La Paz, BCS
Member Is Offline
Mood: happy - always
|
|
Quote: Originally posted by norte  | Its not the wheel that is the issue...Its the tire. modern low profile TIRES are problematic when airing down.
|
main point is that low profile tires hold only a very small amount of air
the amount of air is actually what supports the weight of the car
since you have only a small amount of air in low profile tires, you don't have any flexibility to let some out
low profile is good for performance and speed - and some like their looks
they have absolutely no business beyond pavement
Harald Pietschmann
|
|
|
4x4abc
Ultra Nomad
Posts: 4290
Registered: 4-24-2009
Location: La Paz, BCS
Member Is Offline
Mood: happy - always
|
|
for off road use tires should have about a 10" side wall
that would amount to a 40" combo with 20" wheels
Harald Pietschmann
|
|
|
norte
Super Nomad
Posts: 1163
Registered: 10-8-2008
Member Is Offline
|
|
| Quote: Originally posted by 4x4abc | for off road use tires should have about a 10" side wall
that would amount to a 40" combo with 20" wheels |
You are then saying a minimum 35 inch combo for 15 inch rims? For competition maybe...but 34-35 will get you along on a 20 inch rim...33's on a 15
are great.
|
|
|
mtgoat666
Select Nomad
Posts: 18396
Registered: 9-16-2006
Location: San Diego
Member Is Offline
Mood: Hot n spicy
|
|
Low profile tires are the latest fad on trucks. People think it looks cool. If you want a truck to be a high performance speed machine then you
shouldn't buy a truck, get a bmw or audi
Woke!
“...ask not what your country can do for you – ask what you can do for your country.” “My fellow citizens of the world: ask not what America
will do for you, but what together we can do for the freedom of man.”
Prefered gender pronoun: the royal we
|
|
|
Santiago
Ultra Nomad
Posts: 3512
Registered: 8-27-2003
Member Is Offline
|
|
It's not that easy guys - if you want a top line interior, full electronics and safety features in a 1500 body/frame, then it comes with fancy-pants
20" rims. Maybe just a west-coast thing? Oh, and $60k, sheesh.
|
|
|
PaulW
Ultra Nomad
Posts: 3075
Registered: 5-21-2013
Member Is Offline
|
|
Yes 10" is the goal for off road use. That is an agreed upon standard. 10" from rim to ground. Such as:
15" rim = 35" tire (the preferred setup for a Jeep TJ and many others)
17" rim = 37" tire (the preferred setup for a Jeep JK/JL 4 door)
18" rim = 38" tire
20" rim = 40" tire
Most OEMs have settled on 17" rim for their off road rigs. Such as a Ford Raptor. Larger rims equate to much more expensive tires due to limited
production, especially for the bigger diameter.
Most off road prerunners are choosing the above 35x15" and 37x17" rims. Most full size racers choose bigger.
One can still buy a new truck with 17 or 18" rims even for the high end versions. Probably requires digging pretty hard to find those options, then
special order. Example buy a Ford F350 off the lot then find take off 17" rims that were sold for work trucks and have them power coated to match the
new truck. Guys do it all the time. Result is 37x17" tires. Not inexpensive, but technically correct.
If you test drive a new truck with 20" rims back to back with one with 17 or 18" rims on a wash board or a potholed road you will notice a big
difference in the ride quality. Yes my new truck has the 18" ones. Saved money and got a significantly better ride. It wont be used for significant
off road use because the tire diameter is only 32" (7" rubber to ground a compromise I can live with)
|
|
|
TMW
Select Nomad
Posts: 10659
Registered: 9-1-2003
Location: Bakersfield, CA
Member Is Offline
|
|
How do the class 11 VWs make it thru a race.
|
|
|
4x4abc
Ultra Nomad
Posts: 4290
Registered: 4-24-2009
Location: La Paz, BCS
Member Is Offline
Mood: happy - always
|
|
low vehicle weight
engine weight on axle = more traction
trailing arm from suspension (wishbone)
Harald Pietschmann
|
|
|
4x4abc
Ultra Nomad
Posts: 4290
Registered: 4-24-2009
Location: La Paz, BCS
Member Is Offline
Mood: happy - always
|
|
| Quote: Originally posted by PaulW | Yes 10" is the goal for off road use. That is an agreed upon standard. 10" from rim to ground. Such as:
15" rim = 35" tire (the preferred setup for a Jeep TJ and many others)
17" rim = 37" tire (the preferred setup for a Jeep JK/JL 4 door)
18" rim = 38" tire
20" rim = 40" tire
Most OEMs have settled on 17" rim for their off road rigs. Such as a Ford Raptor. Larger rims equate to much more expensive tires due to limited
production, especially for the bigger diameter.
Most off road prerunners are choosing the above 35x15" and 37x17" rims. Most full size racers choose bigger.
One can still buy a new truck with 17 or 18" rims even for the high end versions. Probably requires digging pretty hard to find those options, then
special order. Example buy a Ford F350 off the lot then find take off 17" rims that were sold for work trucks and have them power coated to match the
new truck. Guys do it all the time. Result is 37x17" tires. Not inexpensive, but technically correct.
If you test drive a new truck with 20" rims back to back with one with 17 or 18" rims on a wash board or a potholed road you will notice a big
difference in the ride quality. Yes my new truck has the 18" ones. Saved money and got a significantly better ride. It wont be used for significant
off road use because the tire diameter is only 32" (7" rubber to ground a compromise I can live with) |
the move from 15" to 17" wheels was actually initiated by the off road racers - they needed bigger brakes for the increased horsepower
with that the tires went to 37"
similar development with many SUVs - more power = larger wheels
but same tire size
that lead to lower profile tires
loss of ability to air down
lousy off road performance
on many SUVs you can't fit any wheel smaller than 17" due to the brake size (in front)
the push to larger than 17" wheels in the private sector has only to do with optics
Harald Pietschmann
|
|
|
StuckSucks
Super Nomad
Posts: 2325
Registered: 10-17-2013
Member Is Offline
|
|
I know a lot of high-horsepower off-road trucks run on 42" tires which can reduce the chance of sidewall issues.
|
|
|
John Harper
Super Nomad
Posts: 2289
Registered: 3-9-2017
Location: SoCal
Member Is Offline
|
|
Looks like more than a few tire plugs to fix that one.
John
|
|
|
| Pages:
1
2 |
![[*]](images/xmbforum/default_icon.gif){kind=icon}
