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01-06-2018, 08:16 PM | #1 |
Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008
Location: nj
Posts: 4,790
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What effect Would a donut spare have on a differential?
Assuming you put your doughnut spare tire on one of the front wheels with that tend to mess up the differential? I mean it’s not as big in diameter as a regular wheel and my understanding is the differential needs to wheels of the same diameter to work properlly.
Or is it in fact perfectly OK to put that spare opposite a regular wheel on the front end?
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Synthetic Oil: Its All In Your Head |
01-06-2018, 08:53 PM | #2 |
Drives: 2016 SE Join Date: Nov 2015
Location: Silicon Valley
Posts: 1,137
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the manual does not prohibit
■When the compact spare tire is attached The vehicle speed may not be correctly detected, and the following systems may not operate correctly: ●ABS ●Brake assist ●VSC ●TRAC ●Cruise control (if equipped) ■Speed limit when using the compact spare tire Do not drive at speeds in excess of 50 mph (80 km/h) when a compact spare tire is installed on the vehicle. The compact spare tire is not designed for driving at high speeds. Failure to observe this precaution may lead to an accident causing death or serious injury. since its not a limited slip diff there should be no problem i remember on some of the performance cars i had with limited slip diffs the spare had to be in front so a rear flat meant demounting 2 wheels on those rwd cars imagine a posi rear end forced to slip continuously by mismatched tire heights ouch! |
01-07-2018, 01:07 AM | #3 |
Drives: 2013 NCP130 Join Date: Nov 2015
Location: Sydney, Australia
Posts: 376
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The compact spare will have less grip than a standard size tyre. On the front, it wil affect youe steering, acceleration and braking. If you are only going to use it to get to the nearest tyre repairer, fine. If you have to go any sort of distance, it's probably better to put the space saver on the rear of the Yaris.
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Running on standard AU 14" steel wheels (14x5 rims, 175/70R14 tyres). Added reversing camera and touch screen radio, cruise control, 16" rear wiper blade, tow bar and dash cam. |
01-07-2018, 08:33 AM | #4 |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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With a regular open diff it will no effect. You should not if you have a limited slip diff.
However as others have said, you really shouldn't ever use a space saver on the front as 75%ish of your stopping power comes from the two front wheel. As well as steering. |
01-08-2018, 05:00 AM | #5 | |
Drives: 2014 Icon+ 1.33l Multidrive Join Date: Nov 2010
Location: Staffordshire Moorlands, UK
Posts: 145
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Quote:
But if you are some distance from the nearest place where the flat tyre can be repaired or replaced, or home for access to another jack (if owned)or some means of supporting the car and only have the vehicle jack, there really is no other option. How many of us carry around a trolley jack, axle stands etc.? Hence, I would suspect the 50mph limit to allow for the smaller width tyre. I have been in that situation and, if driven sensibly, it does not pose a problem. e.g. take corners much slower, think ahead, remain a longer distance from vehicles in front etc. |
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01-08-2018, 07:29 AM | #6 | |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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Quote:
Jack up the rear and replace the rear tire with the spare. Then jack up the front and put that good tire on the front. Not too difficult |
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01-08-2018, 02:55 PM | #7 |
Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008
Location: nj
Posts: 4,790
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Well i got to try the donut.
Picked up a nail the night befor a 6 inch snow. Went out in the am early to go food shopping and the TPMS ! was on. Flat rear tire. As I have Parkinsons and have trouble moving my hands sometimes I took the wifes car and called AAA to change the tire upon returning from shopping. Then went out driving n the snow. Not bad!
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Synthetic Oil: Its All In Your Head |
01-08-2018, 09:01 PM | #8 | |
Drives: 2007 yaris 3 door Join Date: Sep 2015
Location: Denver, Colorado
Posts: 1,000
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Quote:
you should have learned this in driving class... |
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01-09-2018, 06:51 AM | #9 | |
Drives: 2014 Icon+ 1.33l Multidrive Join Date: Nov 2010
Location: Staffordshire Moorlands, UK
Posts: 145
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Quote:
I still don't think there is a more substantial risk by fitting it to the front IF care is taken when driving. Toyota don't offer any preferences or warnings in the manual either. If it was that impotant, they would surely advise rear fitting only? In the U.K. it is usually avised, when replacing tyres, to fit the new ones on the rear i.e. if changing front tyres, swap the wheels, front to back. So fitting the spacesaver to the rear sort of negates that. We don't rotate tyres/wheels which seems to be common in the U.S. nor is it part of the sevicing schedule. I have an old classic car and all the tyres are no wider than the Yaris's "doughnut" with no limit on speed - however the max speed of the car is not much more than 60mph! |
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01-09-2018, 09:15 AM | #10 | |
1NZ-6spd
Drives: '05 6-Spd Vitz RS Join Date: Oct 2008
Location: Oshawa, Ontario, Canada
Posts: 2,967
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Quote:
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01-09-2018, 09:40 AM | #11 |
Drives: 2009 Base Hatch 2 Dr Auto Join Date: Dec 2008
Location: nj
Posts: 4,790
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Good observation about the cross-section of the donut resembling a motorcycle tire. Food for thought!
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