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tyre diameter

  • little boghopper
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11 Dec 2016 10:58 #175521 by little boghopper
tyre diameter was created by little boghopper
hello all, apols if this is in the wrong posting area , just tell me where to go in future, on a very steep forum learning curve so please bear with.:blink:
i recently fitted some 205 70 r 15 AT tyres to my little bog hopper and it turned out they were about 50mm diameter larger , so i changed
the rear tyres to match, my question is. if i get a puncture and change it for the tailgate spare which is a standard road tyre 205 70 r 15
(smaller diameter) driving with two diff size wheels will knacker the rear diff right? so i now need a spare which is the AT size?
hope this does sound like a stupid to obvious question ,cheers Liam.

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11 Dec 2016 12:00 #175529 by Keithy
Replied by Keithy on topic tyre diameter
I always thought when I had an odd size spare I'd put it on the front.....problem with using online tyre rolling diameter charts is the remoulds are usually "fikker" as a kid said to me the other day....makes it tricky to guess.


Just jack one side of the car and put the oddball on the front to get you home......or carry a puncture repair kit and a pump?

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11 Dec 2016 12:37 #175532 by Busta
Replied by Busta on topic tyre diameter
It won't knacker the diff any more than driving around a corner does. Maybe if you left it on for 50,000 miles it would cause accelerated wear, but nothing exciting will happen.
A bigger concern would be fitting it on the front if you have ABS. The different speed of rotation will confuse things.

And avoid using 4wd unless the going is really slippery. The smaller tyre will lead to more transmission windup than usual.

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  • wombat
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11 Dec 2016 16:57 #175545 by wombat
Replied by wombat on topic tyre diameter
if you check out a car with a *space saver* spare wheel they are always a smaller diameter than the roadwheels fitted, so as Busta says it won,t knacker the diff unless you drive silly mileage on it :)

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11 Dec 2016 17:50 #175549 by Riccy
Replied by Riccy on topic tyre diameter
Its fine to use as a spare as they all say. Any diff will allow a bit of 'diff'erence between wheels. Thats what they are for (unless locked).

have a look at this for size comparisons:

tiresize.com/tyre-size-calculator/

Riccy.

J999 MNY, ULYSSES M18 VVT with ITB's Dyno tested at 130hp

Pickup/tipper, R7me gearbox & 6.4 Rocklobster, 31" Toyo MT, 2x ARB air locker 3.9 diffs in braced axles, 6" total lift, Floating rear conversion, Raptor painted, CB, Recaro's, Caged, etc, etc...

www.youtube.com/user/riclemus

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  • little boghopper
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11 Dec 2016 21:14 #175554 by little boghopper
Replied by little boghopper on topic tyre diameter
cheers fellas, thanks for your advice/info, i,ll keep my fingers crossed for no nails, but ok if that happens!
where would a man make a post about gear box solenoid wiring , in the tech post side of things on here ?
L, looks like mine wouldnt like going under water for long, might cover it in silicone!

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