Tyre profile

[F1fan]

Currently on 215/45/17.

 

Am thinking of changing to profile 50 or 55 when my tyres are due for change. Any significant differences in terms of

 

1) Comfort

2) Noise

3) Weight of tyres

 

when comparing to profile 45?

[Joe_Legal]

Assuming you are going to use back the same tyre, just with a bigger profile of 50 or 55 compared to the current 45, what will be a lil more significant will be

a lil more comfortable, but handling will suffer a little, the car may take just a lil longer to turn.

[Shull]

sorry to hijack thread..but since it's similar questions, i would like to post my questions too..

 

i'm currently on 195/60/15 and i wanna change to a lower profile tyres..prolly around 55..can i use back my rim or must i buy new rims to fit the new profile?

 

and will the error in speedo reading be significant?

Edited October 30, 2007 by Shull

[Joe_Legal]

I am assuming that you are talking about changing from 195/60/15 to 195/55/15

If so: yes, you can use back your same rims.

And the speedo will read approx 1.0327 times faster than your actual speed.

 

e.g after the change, your car is really travelling only at 100.0 km/h when the speedo read about 103.27 km/h, theoretically speaking

[Shull]

ok..the diff is -3% leh..is it adviseable to have such a big diff?

 

other than speedo haywire..any effect in performance or safety?

Edited October 30, 2007 by Shull

[Joe_Legal]

well, the diff being significant or not, I think up to individual judgement.

IMO, the difference not big. Coz usually I give myself bigger safety buffer when got TP or camera arounf

 

Just changing the sidewall height from 60% to 55% with all other specs being the same, there should not be any significant safety issues on Singapore roads. Performance-wise the car handling should improve a lil, steering a lil more crisp. But ride might be more harsh, less comfortable.

Edited October 30, 2007 by Joe_Legal

[Shull]

i read any diff more than 3% will affect the brakes leh..and i go up north quite often..

[Joe_Legal]

hmm.. I've never heard of that before, that reducing the profile of more than 3% will affect braking adversely.. if anything, I'd guess reducing the profile improves rather than reduce braking ability. Well, if there're more info, it'll be interesting theory to learn..