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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Wheels / Tires / Suspension / Brakes Effects of switching from 17" 225 to 18" 235 / 275 staggered.
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      02-10-2016, 06:07 PM   #1
dave09a
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Effects of switching from 17" 225 to 18" 235 / 275 staggered.

Its nearly time to change the tires on my car and it seems its cheaper to buy a used set of genuine msport with reasonably good wear on the tires, than it is to buy new tyres.

Should there be any extra wear on the standard suspension in the 520d by switching to a staggered 235/40/18 & 275/40/18 genuine msport alloy?

Still in warranty and I dont want any claims on say the suspension denied on switching the alloys to something they wouldn't sell from factory.

It would be switching from the alloy style numbers; 236 to 350m.

Last edited by dave09a; 02-10-2016 at 06:14 PM..
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      02-10-2016, 07:21 PM   #2
snj1013
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Quote:
Originally Posted by dave09a View Post
Its nearly time to change the tires on my car and it seems its cheaper to buy a used set of genuine msport with reasonably good wear on the tires, than it is to buy new tyres.

Should there be any extra wear on the standard suspension in the 520d by switching to a staggered 235/40/18 & 275/40/18 genuine msport alloy?

Still in warranty and I dont want any claims on say the suspension denied on switching the alloys to something they wouldn't sell from factory.

It would be switching from the alloy style numbers; 236 to 350m.
No problems whatsoever. You could even go with the 19" 351 wheels. The only item you might want to research is the weight of the wheel/tire combination compared to your stock setup. This will likely increase your car's unsprung weight which can adversely impact performance (both acceleration and braking). For example, if the new setup wheels 5lbs more per wheel/tire assembly, the total increase in unsprung weight would be 20 lbs. Adding 20lbs to a 4000lb car seems insignificant, however the general rule of thumb is unsprung weight multiplied by 10 will give you an idea of the overall impact. For the 5lb per assembly example, you would be adding. 200lbs to the vehicle. Some will say the 10/1 ratio is a bit high, but nonetheless you should be aware of this impact.
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