Changing tyre profile on 17" rim from 50 to 55

Wheels, Tyres, Suspension, Chassis
rmcamps
Posts: 9
Joined: Sat Nov 11, 2017 11:50 pm

Changing tyre profile on 17" rim from 50 to 55

Post by rmcamps » Sat Nov 11, 2017 11:54 pm

Hello,
I want to change c4 cactus shine edition tyres (205/50 R17) to 205/55 R17 because on my country routes & highways are bad.
Do you think car stability and general driveability will be affected?
Thank you everybody for your answers.


Prestone
Posts: 16
Joined: Sun Feb 19, 2017 4:10 pm

Re: Changing tyre profile on 17" rim from 50 to 55

Post by Prestone » Sun Nov 12, 2017 5:54 am

I did it on my cactus and it works just fine, as a bonus your speedo will show your true speed with a 55.


Hammy
Posts: 36
Joined: Sat Apr 29, 2017 3:19 pm

Re: Changing tyre profile on 17" rim from 50 to 55

Post by Hammy » Sun Nov 12, 2017 8:08 am

I would also inform/Check with your insurance...any modification no matter how small will invalidate your cover.


xireland
Posts: 45
Joined: Thu Nov 03, 2016 3:38 pm

Re: Changing tyre profile on 17" rim from 50 to 55

Post by xireland » Sun Nov 12, 2017 2:23 pm

sorry maybe my question sounds stupid but
do you have to change the alloys wheels or only the tires ?
cause sounds good for me too


rmcamps
Posts: 9
Joined: Sat Nov 11, 2017 11:50 pm

Re: Changing tyre profile on 17" rim from 50 to 55

Post by rmcamps » Sun Nov 12, 2017 3:05 pm

I will only change tyres from 50 to 55 grip.
17" alloy whells will remain the same.

Will result in a wheel rolling diameter change from 637 millimeters to 657 (an increment of 3,22%).


rmcamps
Posts: 9
Joined: Sat Nov 11, 2017 11:50 pm

Re: Changing tyre profile on 17" rim from 50 to 55

Post by rmcamps » Sun Nov 12, 2017 3:10 pm

Thank you Prestone,

did the change affect fuel consumption? Or the difference is negligible?
Is the ride smoother and more comfortable?
Did it change road noise?

Thank you!


Prestone
Posts: 16
Joined: Sun Feb 19, 2017 4:10 pm

Re: Changing tyre profile on 17" rim from 50 to 55

Post by Prestone » Sun Nov 12, 2017 3:32 pm

It uses a bit more fuel, but the shown MPG will fall some since it is now showing the real MPG.

Im getting 60 MPG, and that is only on small roads with a lot of stop and go.

I think they are more comfortable, no change i noise, noise is largely a tire thing, some are more noisy than others.


rmcamps
Posts: 9
Joined: Sat Nov 11, 2017 11:50 pm

Re: Changing tyre profile on 17" rim from 50 to 55

Post by rmcamps » Sun Nov 12, 2017 3:51 pm

Thank you Hammy. I will check with insurance company.
I guess will depend on each country regulations of vehicle modifications (I wonder if 3.22% of rolling diameter change is accepted by law)


rmcamps
Posts: 9
Joined: Sat Nov 11, 2017 11:50 pm

Re: Changing tyre profile on 17" rim from 50 to 55

Post by rmcamps » Sun Nov 12, 2017 5:06 pm

Thank you Prestone,

I suspect it will be good decision for off-road or farm roads..

That is great fuel consumption, do you have Puretech 110 with EAT6 automatic transmission?


Prestone
Posts: 16
Joined: Sun Feb 19, 2017 4:10 pm

Re: Changing tyre profile on 17" rim from 50 to 55

Post by Prestone » Sun Nov 12, 2017 7:29 pm

No i have a 100hp diesel :)


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