my son need to drive his bora on it's spare for several days. it's on the front, but before stuffing swapping back to front, then vice versa, is it safe to drive with the spare being only 8.5mm smaller in total wheel circumference 1993.3/2001.8mm, or 3mm diameter?
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driving on a different size tire
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Originally posted by ericcs View Postmy son need to drive his bora on it's spare for several days. it's on the front, but before stuffing swapping back to front, then vice versa, is it safe to drive with the spare being only 8.5mm smaller in total wheel circumference 1993.3/2001.8mm, or 3mm diameter?
Will be just like driving around a large corner and thats what a diff is for isnt it.
A new tyre has approx 8mm of tread on it2021 Kamiq LE 110 , Moon White, BV cameras F & B
Mamba Ebike to replace Tiguan
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Originally posted by Hillbilly View PostIf its only 3mm diameter it wont matter as thats less then the difference between a new and a worn tyre
Will be just like driving around a large corner and thats what a diff is for isnt it.
A new tyre has approx 8mm of tread on it
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Originally posted by ericcs View Posti was thinking along this line also, especially if you have an under inflated tire, the radius can be a lot less than 3mm2021 Kamiq LE 110 , Moon White, BV cameras F & B
Mamba Ebike to replace Tiguan
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im guessing the (y) stands for 'yet'
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Originally posted by Hillbilly View PostRadius doesnt matter its The DIAMETER that does as it does a different number of revs per kilometer and will there fore make the diff work a very slight bit harderResident grumpy old fart
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Originally posted by kaanage View PostDiameter = 2 x radius. I suspect your meant circumference which is the length around the perimeter of the tyre but this = 2 x pi x radius (or pi * diameter), so the difference in radius is directly proportional to the difference in circumference.
195/65/15 v 225/40/18
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Originally posted by ericcs View Postthe diameter difference is only 3mm, and the circumference 8.5mm as per online conversion chart
195/65/15 v 225/40/18
iv seen 4 different size tyres come off a 4mo bora once.
if you did it for long enough there would be odd wear on either the 225/40 or the 195/65
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Originally posted by kaanage View PostDiameter = 2 x radius. I suspect your meant circumference which is the length around the perimeter of the tyre but this = 2 x pi x radius (or pi * diameter), so the difference in radius is directly proportional to the difference in circumference.
In the OP's case it wont make enough difference to matter. Lots of people use an old worn tyre for a spare and have no hesitation using it, if needed the day after putting new tyres on the vehicle. It could therefore have a difference in diameter of up to 12 mm.
Havent heard of any diffs going bang.2021 Kamiq LE 110 , Moon White, BV cameras F & B
Mamba Ebike to replace Tiguan
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2025 - Below Forum
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