185/65R14 to 195/65R15 Big Difference?

[ionfly]

Hi folks, 

 

I stupidly bought an Octavia estate without checking insurance first (went on assumptions from similar). Bought, taxed and insured similar for less than the difference of insuring the Octavia (which I still can't work out) and am wondering if it's worth taking the old wheels off the Octavia and putting them on the new, which has close to balding tyres and no spare wheel. I know about decreased fuel economy and the loss of power that comes with bigger tyres/wheels but would a jump from 185/65R14 to 195/65R15 really going to make much of a difference, or is it worth forking out on a new set of tyres (+spare)?

 

Cheers,

 

MArk

 

PS: Bear in mind that I'll probably end up driving this motor for a year then PXing for another cheapo run around...

[KenONeill]

You'd be making a significant change to the rolling radius, and hence potentially setting the speedometer to illegal readings.

[octyal]

next to no difference really - only a 2% change

 

[KenONeill]

next to no difference really - only a 2% change

The OP states that the new set is 195/65R15; that's another 12.5mm increase in rolling radius.

[ionfly]

Is that something to be concerned about bearing in mind that it's more than likely going to the scrap heap provided it lasts the remainder of its MOT?

[octyal]

Oops, didn't spot the 15 bit

[KenONeill]

Is that something to be concerned about bearing in mind that it's more than likely going to the scrap heap provided it lasts the remainder of its MOT?

Well, that puts your speedo out far enough that you could get speeding tickets when it says you're doing legal speeds.

[KenONeill]

Oops, didn't spot the 15 bit

I thought that; I'd agree with you about changing size by one width not mattering because the change in diameter is less than the tread depth.

[Rooted]

Back in the real world (driving the car ) your actual speedo might read the real speed as currently it is quite possibly under reading.

But that is easy to check with GPS.

http://kouki.co.uk/utilities/visual-tyre-size-calculator

Edited 29 April, 2016 by GoneOffSKi

[ionfly]

Well, that puts your speedo out far enough that you could get speeding tickets when it says you're doing legal speeds.

 

Ah right, see what you're saying now - nice one; hadn't thought of that...