Is the space saver spare wheel "one size fits all"?
01-16-2007, 11:27 AM
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My Ride: F11 535i M-Sport,, Silver, Black Leather, LED Adaptive headlights
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Originally Posted by the-oneil' post='378640' date='Jan 15 2007, 09:46 PM
so those with 19" alloys will have the same space saving spare as 17" or 18" rims. How will it fit? Am I missing something?Circumference of 245/40x18 = 2052.09 mm
Circumference of 245/45x17 = 2049.26 mm
Circumference of 135/80x17 = 2035.45mm (According to my dodgy maths)
A difference of less than 1%, well within the limits of safety.
Probably no more than the difference in circumference of one tyre being under-inflated by a couple of pounds.
So the overall diameter of wheel + tyre is almost the same no matter what wheel size you have on your car.
It is just how much tyre or how much wheel you can see. As wheels tend to look better than tyres we often go for bigger wheeel, shallower tyre options, but the overall size is about the same.
if it were not your speedo would be inaccurate and your brakes degraded.
01-16-2007, 12:01 PM
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My Ride: My ex-ride: EU '08 LCI 520dA. Space Grey, Sport Seats in Black Leather/Fabric Anthracite, Sport Steering Wheel, A/C with Extended Features, Hi-Fi Speakers, Cup Holders, Cruise with Braking function, Folding Rear Seats, Xenons, Park Distance Control.
The wheel radius should be the same no matter even how wide the wheel is!
From OEM 16" to 19"
- to even 20" or 21" bling-blings 
The OEM spare is it!
From OEM 16" to 19"
- to even 20" or 21" bling-blings The OEM spare is it!
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