Compact spare in the rear

[TheVoiceOfReason]

Look at what kind of rear wheel is on this crashed BRZ a few years ago.

http://www.newsday.com/long-island/s...?firstfree=yes

[mdm]

Originally Posted by TheVoiceOfReason

Look at what kind of rear wheel is on this crashed BRZ a few years ago.

Yeah, but even if the donut contrubuted to the crash (we don't know this, right?), that's a different reason for not putting the donut on the drive axle, than "your diff will overheat and die"

[Romanov]

If you drive with a spare tire on your rear wheels..

[FLESH KILLA]

Really? Didn't know this... My car didn't come with manual 😢

Sent from my Nexus 6P using Tapatalk

[Swagopopotamus]

Originally Posted by guybo

Don't be a lazy ass. Just put the donut on the front. If you are a lazy ass and call aaa to come change your tire 1) shame on you 2) if you insist that the aaa man install the donut on the front you had BETTER give him a good tip ya ****.

-your friendly AAA man who's sick of changing tires for snotty lazy asses

This is the exact reason we pay for AAA. Not sure why you're complaining. It keeps you employed.


-your friendly snotty lazy ass who creates jobs for AAA men.




But seriously folks, tip the driver when you call AAA.

[guybo]

Originally Posted by TheVoiceOfReason

Look at what kind of rear wheel is on this crashed BRZ a few years ago.

http://www.newsday.com/long-island/s...?firstfree=yes

Looks like that person was going faster than the recommended 50 MPH though

Originally Posted by mdm

I have never seen an FWD manual saying so.

I've seen it before, but I can't remember what car it was. Maybe an SI? But some FWD cars do recommend doing the switch. But a lot of high end cars with LSD don't have this requirement (non-square wheels) so I don't think it's a big thing esp. if you use the donut for what it's meant for- short distance slow drive to get the tire taken care of.

[PandaSPUR]

Originally Posted by mdm

By my calculation, the [nominal] difference in diameter between the T135/80D16 spare and the 215/45R17 regular tire is 0.5%.


That's equivalent to the difference caused by a 300-m radius turn. Is that massive?


Or is the actual difference in diameter larger than the nominal difference, e.g. becuase the spare and the regular tire compress very differently?

You're also forgetting the difference in width... that spare tire has a lot less grip than your full size tire.

EDIT: using this: https://tiresize.com/calculator/

There is a 60.4% difference in width and .4% difference in circumference

[mdm]

Originally Posted by PandaSPUR

You're also forgetting the difference in width... that spare tire has a lot less grip than your full size tire.

No I am not, difference in the contact patch size should not cause any additional strain on the differential (in normal driving, I am not talking launching or attempting donuts), difference in diameter theoretically could, but I am not sure how if it's only 0.5% or 0.4%.

[PandaSPUR]

Originally Posted by mdm

No I am not, difference in the contact patch size should not cause any additional strain on the differential (in normal driving, I am not talking launching or attempting donuts), difference in diameter theoretically could, but I am not sure how if it's only 0.5% or 0.4%.

60% is a huge difference, I doubt you need to be launching the car to cause that spare to slip.

I'm curious myself, but I personally do not plan on ever testing it out myself.

[Mr.ac]

You "can" drive with the spare on the rear with zero problems, if you're smart about it.

Toyota just wants to cover their as$ because people are retarded. They assume retards will drive 80mph with all the nannies off and then complain the rear end is making funny sounds after a flat. Or worse case some retard will get the rear end lose and plow into (insert verb) and kill damage.

If I get a flat in the rear, in town and a tire shop is only 10 minutes away, and I'll never go over 40 mph. I'll do it.
Now if I'm the middle of bumfuck vill, and I'm 2-3 hours to the nearest city, I'll swap out the good front tire put it in the rear and drive under 60mph.

[bhmax]

My guess is so the car will understeer instead of oversteer.

[FR-Sky]

I think a spare tire mean get you to some place safe ASAP or closest place you can replace your tire. I dont think it meant for more than 10-20 miles.

It depends on how flat the tire is. If it still has 15-20 PSI,,i would just drive to a gas station within 1-5 miles radius. If the sidewall got damaged and i cant put air, then i will follow what the manual said and call road side. If the car manual said u need a swap,, i think the road side would have to do it for you.

[Mr.ac]

Originally Posted by FR-Sky

I think a spare tire mean get you to some place safe ASAP or closest place you can replace your tire. I dont think it meant for more than 10-20 miles.

It depends on how flat the tire is. If it still has 15-20 PSI,,i would just drive to a gas station within 1-5 miles radius. If the sidewall got damaged and i cant put air, then i will follow what the manual said and call road side. If the car manual said u need a swap,, i think the road side would have to do it for you.

Lol you think....

You can drive on a spare for more than 100+ miles, as long as you don't go over 60 mph. I have when I was in the middle of the of a road trip. Perfectly safe. But the sooner you fix a normal tire the better.


I would not advise you to drive on low psi tire. I have killed a tire that way. You know how? The rim rolled over the edge of the side wall just inside the tire. Made a gash that no tire shop would repair.
It looked like some one took an ice scream scoop and cut out a 2" gash. It didn't cut through but there was little protection.

There was only one turn I made that did that damage. The local tire shop was only 2 miles away in town.

[FR-Sky]

Originally Posted by Mr.ac

Lol you think....

You can drive on a spare for more than 100+ miles, as long as you don't go over 60 mph. I have when I was in the middle of the of a road trip. Perfectly safe. But the sooner you fix a normal tire the better.


I would not advise you to drive on low psi tire. I have killed a tire that way. You know how? The rim rolled over the edge of the side wall just inside the tire. Made a gash that no tire shop would repair.
It looked like some one took an ice scream scoop and cut out a 2" gash. It didn't cut through but there was little protection.

There was only one turn I made that did that damage. The local tire shop was only 2 miles away in town.

Thats why i said: "I think a spare tire mean get you to some place safe ASAP or closest place you can replace your tire ". What i really meant is fix or replace tire ASAP.

I mean up to you if you continue to drive more than 50 miles with your spare or so. Its your choice. I cant force you

Last time i had a flat tire, it was 20 psi left. I went to America tires just 2.5 miles away and had it fix right away. Nothing was damage.

I mean thats up to you too, if you like to wait for the tow or rotate the spare yourself. Mine was a flat rear tire.