Sharing - F10 17" wheel size vs 18" and 19"

[detach8]

Just for sharing...

After switching to 19" I find that my car feels a little less powerful BUT seems to be travelling faster than usual.

So I went to compare my old 17" vs new 19" tyre sizes - the stock 17" tyres seems to be undersized. 18" and 19" are similar.

EDIT: Turns out I got the 17" tyre sizes wrong! It should be 225/55/17!

Specification Sidewall Radius Diameter Circumference Revs/Mile Difference
225/50-17 4.4in 12.9in 25.9in 81.2in 780 0.0%
245/45-18 4.3in 13.3in 26.7in 83.8in 756 3.2%
245/40-19 3.9in 13.4in 26.7in 83.9in 755 3.3% FRONT
275/35-19 3.8in 13.3in 26.6in 83.5in 759 2.8% REAR

Notice the 245 profile tyres (front) for both 18" and 19" seems to have almost the same radius/diameter. The rear wheels are typically slightly smaller, but the 17" is significantly smaller. This means your speedo is actually showing speeds *slower* than you are actually traveling if you are on 17" stocks and that also means your FC will seem *better* than you are actually achieving on your car.

 

[Slow_poke_driver]

Re: Sharing - F10 17" wheel size vs 18" and 19"

You know why the 17" is smaller?

This is because you chose the wrong profile.

F10 stock is 225/55/17 or 245/45/18.

19" got more bumpy and noisy?

 

[detach8]

Re: Sharing - F10 17" wheel size vs 18" and 19"

Har it's 225/55 meh? Then sorry it's my mistake!!

I already left my 17"s at the shop so I thought it's 225/55.

No leh my 19"s surprisingly more quiet and comfortable. Also RFT. Previously on Bridgestone RFT, now on Michelin Primacy HP RFT

 

[douggie]

Re: Sharing - F10 17" wheel size vs 18" and 19"

Har it's 225/55 meh? Then sorry it's my mistake!!

I already left my 17"s at the shop so I thought it's 225/55.

No leh my 19"s surprisingly more quiet and comfortable. Also RFT. Previously on Bridgestone RFT, now on Michelin Primacy HP RFT

Have photos of new rims?

 

[kennypmf]

Re: Sharing - F10 17" wheel size vs 18" and 19"

So for F10 which size is ideal? 19" or 20"?

18" shud be no point as stock is 17" right?

 

[lucas111]

Re: Sharing - F10 17" wheel size vs 18" and 19"

Mine is 20"

Front 245/35/20 Overall diameter 679.5mm
Rear 285/30/20 Overall diameter 679mm

Very evenly matched!

 

[Folerlop]

Re: Sharing - F10 17" wheel size vs 18" and 19"

Ideal size depends on individual perferences and pocket size ($$$)

Whatever the size of rims, just make your tyres overall diameter is same or closest (-+2%)

So for F10 which size is ideal? 19" or 20"?

18" shud be no point as stock is 17" right?

 

[detach8]

Re: Sharing - F10 17" wheel size vs 18" and 19"

I got BMW Style 331 original 19" rims and RFT since I find 20" too low and replacement tyres too expensive. It's like another level of price jump.

AFAIK average prices of tyres

225/55/17 $200+
245/45/18 $250+
245/40/19 $300+
245/35/20 $400+

 

[Folerlop]

Re: Sharing - F10 17" wheel size vs 18" and 19"

not forgetting the rear if on staggered rims.. esp 19" and above....

I got BMW Style 331 original 19" rims and RFT since I find 20" too low and replacement tyres too expensive. It's like another level of price jump.

AFAIK average prices of tyres

225/55/17 $200+
245/45/18 $250+
245/40/19 $300+
245/35/20 $400+