My MK3 1.6tdi Superb has 215/55R17 P7 Cinturatos with W speed rating. They are very hard and i feel every small bump on the road (Even with 2.1bar front and 2.2 rear) 

I never make speed so I think of replacing them with H rating but H tires mostly exist in 215/60R17 size.  Would this size fit the car? Any ideas?

1 hour ago, eksa said:

My MK3 1.6tdi Superb has 215/55R17 P7 Cinturatos with W speed rating. They are very hard and i feel every small bump on the road (Even with 2.1bar front and 2.2 rear) 

I never make speed so I think of replacing them with H rating but H tires mostly exist in 215/60R17 size.  Would this size fit the car? Any ideas?

Hi they would fit but going up a profile is going to throw out your rolling radius and make the speedo inaccurate unfortunately.

5 hours ago, Smirnoff1977 said:

and make the speedo inaccurate unfortunately

in most cases opposite,
value on car speedometer will become more accurate
with stock 215/55r17 it were +5km on 100kmh (+10km on 200kmh)
with 225/55r17 speedo shows just +2km when compared to GPS

 

@eksa

visit https://tiresize.com/comparison/

Changing the tyres size and speed rating from the manufacturer specified one would require approval form the insurance company. It would be classed as a modification and failure to notify (and get approval) would almost certainly result in no insurance should the worst happen. Checking the tyres (not only for tread) is one of the first things the assessor does. they are not only costing the repairs they are looking for a "get out of jail free card".

 

But why you find the 215 55 17' P7's hard is beyond me. Same tyre on ours and they are fine, did 430 miles on Saturday with no complaints. If you want hard try a 40 profile tyre.

2 hours ago, MartiniB said:

in most cases opposite,
value on car speedometer will become more accurate
with stock 215/55r17 it were +5km on 100kmh (+10km on 200kmh)
with 225/55r17 speedo shows just +2km when compared to GPS

 

@eksa

visit https://tiresize.com/comparison/

Yes but all you have done increase the width the original post asked about changing the profile height from 55 to 60 hence increasing the rolling radius.

45 minutes ago, Smirnoff1977 said:

all you have done increase the width

wrong!
i have increased width for 10mm and height for 10mm(height of car +5mm)
second number "55" means percentage from width not exact height

1 minute ago, MartiniB said:

wrong!
i have increased width for 10mm and height for 10mm(height of car +5mm)
second number "55" means percentage from width not exact height

Wrong the original post has not changed the width just the height? I wasn't referring to you all I did was answer the original post and you changed it to yourself?? If he changed the profile height without the width it will affect the rolling radius end of 

@Smirnoff1977

will write slowly
changing the width does change also height
best way to see how exact is visit https://tiresize.com/comparison/

 

producer accepted tires for different modifications of Superb III
2.0TSI    217hp    Diameter
215/55r17 -    26.3"    0%    ****
235/45r18 -    26.3"    0%
235/40r19 -    26.4"    +0.4%
255/35r19 -    26.0"    -1.1%
245/35r20 -    26.8"    +1.9%
2.0TSI    276hp 4x4
255/30r20 -    26.0"    -1.1%
1.4TSI    123hp
215/60r16 -    26.2"    -0.4%
1.4TSI    148hp ACT
215/50r18 -    26.5"    +0.8%
1.8TSI    177hp
235/50r17 -    26.3"    0%
2.0TDI    188hp
235/35r20 -    26.5"    +0.8%

 

as you can see from -1.1% to +1.9%

then common sense also allows these sizes
225/55r17 -    26.7"    +1.5% (my choice)
235/50r17 -    26.3"    0%
245/45r18 -    26.7"    +1.5%
245/40r19 -    26.7"    +1.5%

 

and yes, choose 215/60r17 instead 215/55r17 is absolutely wrong idea -
Diameter will increase for +3.4% +23mm

4 minutes ago, MartiniB said:

@Smirnoff1977

will write slowly
changing the width does change also height
best way to see how exact is visit https://tiresize.com/comparison/

 

producer accepted tires for different modifications of Superb III
2.0TSI    217hp    Diameter
215/55r17 -    26.3"    0%    ****
235/45r18 -    26.3"    0%
235/40r19 -    26.4"    +0.4%
255/35r19 -    26.0"    -1.1%
245/35r20 -    26.8"    +1.9%
2.0TSI    276hp 4x4
255/30r20 -    26.0"    -1.1%
1.4TSI    123hp
215/60r16 -    26.2"    -0.4%
1.4TSI    148hp ACT
215/50r18 -    26.5"    +0.8%
1.8TSI    177hp
235/50r17 -    26.3"    0%
2.0TDI    188hp
235/35r20 -    26.5"    +0.8%

 

as you can see from -1.1% to +1.9%

then common sense also allows these sizes
225/55r17 -    26.7"    +1.5% (my choice)
235/50r17 -    26.3"    0%
245/45r18 -    26.7"    +1.5%
245/40r19 -    26.7"    +1.5%

 

I will w r i t e  e v e n  s l o w e r  t h e  o r i g i n a l  p o s t  a s k e d  a b o u t  i n c r e a s i n g  t h e  t y r e  h e i g h t  w i t h o u t  c h a n g i n g   t h e   w i d t h.

 

You clearly like to say what you have done so not worth wasting my time. I know what the tyres symbols mean and that changing the width will also change the height slightly but this is not what the person wanted to do!! 

9 minutes ago, MartiniB said:

and yes, choose 215/60r17 instead 215/55r17 is absolutely wrong idea -
Diameter will increase for +3.4% +23mm

This is what I was getting at!!