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Old 05-16-2009, 04:41 PM   #1 (permalink)
Eddles
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Join Date: Apr 2009
Location: Sheffield, England
Posts: 142

Eddles's Astra - '01 Vauxhall Astra ECO4
90 day: 61.03 mpg (US)
Thanks: 41
Thanked 3 Times in 2 Posts
Changing wheel size?

Hello all,

On my Astra, I've currently got 175/80/14 tyres on steel rims. I will soon need 2 new front tyres. Should I stick with the same size or should I choose a different size? I imagine I shouldn't be having a smaller overall wheel diameter or it'd increase engine speed at the equivalent speed. Keep in mind, where I live, the roads are full of potholes, however I will be driving on highways 80% of the time and they tend to be well maintained here in the UK. Also, my current wheel covers are fairly aerodynamic and it'd be sad to lose those covers.

Other Astras has the following tyre sizes as standard - Vauxhall usually use unusual rim measurements so it'd be easier to get rims off other Astras rather than trying to find non Vauxhall rims that fits my car, but I will consider other sizes.

165/80/14
175/70/14
185/65/14
185/70/14
185/65/15
195/60/15
205/50/16

Thanks for your time in advance!

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My aim: to achieve 3L/100km.
Best tank @ 65mph: 864.2 miles 69.36MPGus 3.4l/100km
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