Grande Punto T jet tyres!!

[Sticky235]

My t-jet came with 205 45 17 tyres and I'm wondering if I changed to 205 40 17 would this make a significant difference to ride comfort etc?

 

[scout]

Would make a difference to your speedo

 

[Sticky235]

A lot of difference or not a lot?

 

[Ziggy122]

Not alot
Itdbover reait says 30mph but ud be doing 25mph for example

Also will the speed and weight rating match / be higher?

Ziggy

 

[GYoung87]

There are speedometer calibration calculators online. It may be out but not by much. Not as much as 20% out, as someone suggested.

 

[Sweex]

Here.


1mph difference at 30mph.
Playerd around a bit and it is 2mph slower at 40/50.
3mph slower at 60/70/80.
Considring all speedos over read, then it wont matter too much, plud youre going slower not faster.

 

[jameshobiecat]

The ride will also be slightly firmer and it will be a bit easier to kerb the wheel.

Look out for the load index too, the t-jet requires a higher 88 rating which is less common.