Anonymous
6/22/2025, 6:04:37 PM No.28472500
>capable of getting you unstuck from unstable terrain
>can't handle one tire being different from the others
How?
>can't handle one tire being different from the others
How?
Replies:
Thread 28472500 - /o/ [Archived: 959 hours ago]
Anonymous
6/22/2025, 6:11:32 PM No.28472515
I'm 6 9% beers and a lot of hallucinogens deep so I can't go into detail but it does make sense. Learn about differentials. If you want your car to respond rapidly and do what you tell it to then you've got to make sacrifices like replacing 2 tires at a time. It's nothing to get mad about.
Replies:
Anonymous
6/22/2025, 6:15:05 PM No.28472520
>>28472500 (OP)
Different size tires have different diameters, so at any given vehicle speed, the two tire sizes will be spinning at different speeds. The differentials are there to make up for this to some extent, but only really for turning (and when all of your tires are the same diameter). If you have different size tires, the differentials are working overtime to make up for the difference in speed constantly, even while you're going straight. This puts more friction and thus more heat into them, wearing them out faster. Tires are cheaper than transmission rebuilds.
https://youtu.be/yYAw79386WI
Different size tires have different diameters, so at any given vehicle speed, the two tire sizes will be spinning at different speeds. The differentials are there to make up for this to some extent, but only really for turning (and when all of your tires are the same diameter). If you have different size tires, the differentials are working overtime to make up for the difference in speed constantly, even while you're going straight. This puts more friction and thus more heat into them, wearing them out faster. Tires are cheaper than transmission rebuilds.
https://youtu.be/yYAw79386WI
Replies:
Anonymous
6/22/2025, 6:17:05 PM No.28472527
>>28472500 (OP)
During ww2 essentially, Germans tried to make everything too precise. It’s nice if your tank can shoot a dime at 2000 meters, but all it has to do is shoot another tank. And a tank that is just accurate enough to hit another tank is going to have a simpler, more robust gun system than a sniper rifle masquerading as a tank.
Do you understand the analogies ?
https://www.quora.com/I-often-read-that-German-tanks-were-over-engineered-in-WW2-What-exactly-does-this-mean
During ww2 essentially, Germans tried to make everything too precise. It’s nice if your tank can shoot a dime at 2000 meters, but all it has to do is shoot another tank. And a tank that is just accurate enough to hit another tank is going to have a simpler, more robust gun system than a sniper rifle masquerading as a tank.
Do you understand the analogies ?
https://www.quora.com/I-often-read-that-German-tanks-were-over-engineered-in-WW2-What-exactly-does-this-mean
Replies:
Anonymous
6/22/2025, 6:18:49 PM No.28472533
>>28472515
Damn nigga, what time is it where you're at? Isn't even noon where I live yet. Hope you're doing alright.
Damn nigga, what time is it where you're at? Isn't even noon where I live yet. Hope you're doing alright.
Replies:
Anonymous
6/22/2025, 6:21:17 PM No.28472537
Replies:
Anonymous
6/22/2025, 6:24:13 PM No.28472545
>>28472533
I've been tripping 20 years now I'm fine. I also took some things that inhibited certain cyp450 enzymes to make it last longer. Science yo. Totally legal btw, no I won't tell you.
I've been tripping 20 years now I'm fine. I also took some things that inhibited certain cyp450 enzymes to make it last longer. Science yo. Totally legal btw, no I won't tell you.
Anonymous
6/23/2025, 4:16:14 AM No.28473789
Why don’t they call them samerentials if they need the same tire then?
Anonymous
6/23/2025, 4:41:24 AM No.28473822
>>28473814
The tranny doesn't care about the different tire sizes, the differentials and transfer case do.
The tranny doesn't care about the different tire sizes, the differentials and transfer case do.
Replies:
Anonymous
6/23/2025, 4:48:05 AM No.28473832
>>28473822
Yep. I got my subie at an auto auction unseen over 100k miles. Some ricer had owned it before and after 15 min of driving the whole front end would "chunk" and rock the car synced to the speed. Front diff was blown, PO probably didn't know about much more than engine oil changes.
Yep. I got my subie at an auto auction unseen over 100k miles. Some ricer had owned it before and after 15 min of driving the whole front end would "chunk" and rock the car synced to the speed. Front diff was blown, PO probably didn't know about much more than engine oil changes.
Anonymous
6/23/2025, 5:03:20 PM No.28474595
Do you mean if i have to drive with a donut spare tire in my full time awd car it will fuck the transfer case/differential?
Replies:
Anonymous
6/23/2025, 5:07:50 PM No.28474601
>>28474595
the donuts on subarus are usually large enough that this doesn't happen,
but yes, you will.
the donuts on subarus are usually large enough that this doesn't happen,
but yes, you will.
Replies:
Anonymous
6/23/2025, 5:11:19 PM No.28474606
>>28474595
Not immediately. It will be fine to drive a short distance (under 50 mph, which is the same recommended limit for any other drivetrain layout as well) with a donut on to get you to a tire shop to fix or replace the real tire. They do come with donut spares (for the most part) anyway. It would only be a problem if you left the donut on for days/weeks/months and just kept driving like that (which again, you shouldn't do in a 2WD either).
Not immediately. It will be fine to drive a short distance (under 50 mph, which is the same recommended limit for any other drivetrain layout as well) with a donut on to get you to a tire shop to fix or replace the real tire. They do come with donut spares (for the most part) anyway. It would only be a problem if you left the donut on for days/weeks/months and just kept driving like that (which again, you shouldn't do in a 2WD either).
Replies:
Anonymous
6/23/2025, 6:50:45 PM No.28474797
>>28474601
>>28474606
Thanks, I was using the donut spare only on the rear axle (rotating the tires as needed), assuming a fwd biased awd transmission will not engage the rear differential until really needed and up to 50mph.
>>28474606
Thanks, I was using the donut spare only on the rear axle (rotating the tires as needed), assuming a fwd biased awd transmission will not engage the rear differential until really needed and up to 50mph.
Anonymous
6/24/2025, 10:35:56 AM No.28476278
it's not designed to account for it
Anonymous
6/24/2025, 5:49:56 PM No.28476690
>>28472500 (OP)
It's not really that big of a deal with AWD systems, as they use open and/or slip-type differentials, they can usually manage it fairly well as long as it's not for an extended period of time.
Where it is actually a problem is when you have a 4WD vehicle with locking differentials (or a locking transfer case). A locked differential with different diameter tires on either side will wear the tires out extremely fast and there's a high potential to cause serious damage to the differential.
Same goes for having a locked transfer case with different sized tires front and back. Unless the front & rear differentials have been set up with different gear ratios to do this purposely with is extremely uncommon.
It's not really that big of a deal with AWD systems, as they use open and/or slip-type differentials, they can usually manage it fairly well as long as it's not for an extended period of time.
Where it is actually a problem is when you have a 4WD vehicle with locking differentials (or a locking transfer case). A locked differential with different diameter tires on either side will wear the tires out extremely fast and there's a high potential to cause serious damage to the differential.
Same goes for having a locked transfer case with different sized tires front and back. Unless the front & rear differentials have been set up with different gear ratios to do this purposely with is extremely uncommon.
Anonymous
6/24/2025, 5:50:35 PM No.28476693