Tyres

[neilbauer]

Sorry if this is in the wrong place!

I have 205 40 17 tyres on my car and i'm fed up with the bumpy ride and pot hole risk!

My question is can I go from a 205 40 17 to a 205 45 or 50 17 on the same wheel?

[TheHeretic]

Yes, but your speedo will be out.

[neilbauer]

TheHeretic said:

Yes, but your speedo will be out.

Hi I went from a 16 to 17 wheel so my speedo is out already

[TheHeretic]

neilbauer said:

Hi I went from a 16 to 17 wheel so my speedo is out already

It needn't have been. Why not go back to 16 inch?

[neilbauer]

I prefer the bigger wheel but my 40 profile is way too bumpy!

[Defcon5]

I assume you have put ST wheels on your Fiesta? Be careful that they dont scrub - maybe a more specialist Fiesta forum can tell you?

[R300will]

If you increase profile then drop your rim size back down to 16. Speedo should be more accurate. Or just hook up a sat nav they are pretty accurate at speed measuring.

[tonys]

I don't thimk 45s will make that much difference from 40s, 50s will be more noticeable though. Whether they are any good, or will fit your car, might be a different issue.

[thebigmacmoomin]

I used to have 205/40/17 on my Mk1 Focus. Found the ride too hard so went for 215/45/17 which was a lot better but they didnt look quite as good. Should have got 215/40/17. The car as lowered 30mm on eibachs aswell.

[neilbauer]

I have a cheap after market set of wheels, there is plenty of room at present. I don't really want to go back to a 16" wheel but I do want a bit more rubber between me and the road (if that makes sense)

[Defcon5]

Get them changed. They handle better and accelerate faster on the 16s anyway

[R300will]

Defcon5 said:

Get them changed. They handle better and accelerate faster on the 16s anyway

acceleration due to relatively slightly shorter gear ratio's due to smaller wheel size and tyre profile?

[neilbauer]

Would there be much difference in handling from 16's to 17's? I wouldn't have thought it would have been much!

[R300will]

neilbauer said:

Would there be much difference in handling from 16's to 17's? I wouldn't have thought it would have been much!

I think tyre choice would matter more in that situation

[Techn0]

Go here:

http://www.tyresave.co.uk/tyresize.html

Input your original tyre size then select various sizes @ 17 inches until you have one with a more accurate Speedo and a bigger profile.


The profile or aspect ratio is linked to the width of the tyre.

Eg. Standard 195/55/16 >>>>> aftermarket 215/45/17 only .84% different

[kaf]

Also have a look here http://www.carbibles.com/tyre_bible_pg4.html

Use the calculator to check that your preferred tyre width is compatible with the rim size.

[neilbauer]

Thanks for all your replies