New tyres

[BottomScratcher]

Negative rear camber

Ooops! Yes, negative - the other positive.

[RubAVeeDubDub]

Why not go the other way and consider stretching a 215/40 tyre on your 7.5" rim? Very small stretch. 215/40s are pretty reasonably priced. You can get kumho ku31s in that size for less than $200/corner. The ku31s are a fantastic grip tyre but they are a bit noisy and you'd be lucky to get more than 25,000kms out of a set.

[Diesel_vert]

Why not go the other way and consider stretching a 215/40 tyre on your 7.5" rim? Very small stretch. 215/40s are pretty reasonably priced. You can get kumho ku31s in that size for less than $200/corner. The ku31s are a fantastic grip tyre but they are a bit noisy and you'd be lucky to get more than 25,000kms out of a set.

A 215/40 R18 89Y XL tyre will fit on a 7.5 J wheel quite comfortably (approved wheel widths are 7.0 J to 8.5 J).

However, fitting such a tyre on an Octavia will render the vehicle unroadworthy because of the load index (unless the vehicle manufacturer has approved that particular fitment).

[RubAVeeDubDub]

A 215/40 R18 89Y XL tyre will fit on a 7.5 J wheel quite comfortably (approved wheel widths are 7.0 J to 8.5 J).



However, fitting such a tyre on an Octavia will render the vehicle unroadworthy because of the load index (unless the vehicle manufacturer has approved that particular fitment).

Ahh yes, I forgot that most 215/40r18s have a 89Y load rating.
In reality, how heavy is the Octavia?
I know manufacturers can be a bit OTT with load ratings.

Any chance to slap on a different tyre placard?

[Diesel_vert]

Ahh yes, I forgot that most 215/40r18s have a 89Y load rating.
In reality, how heavy is the Octavia?

On a FWD vehicle, you'd at least have to consider its front GAWR (gross axle weight rating, i.e. the maximum permissible axle load) and the combined maximum load capacity of the tyres fitted on said axle.

A load index of 89 equates to a maximum load capacity of 580 kg per tyre, which is 1160 kg per axle.

If there is a risk of overloading the tyres, you may also have to increase the original tyre inflation pressures (which are only meant for the original tyres) to compensate for the reduction in load capacity of the new tyres, as load capacity (up to its maximum) is proportional to inflation pressure.

I know manufacturers can be a bit OTT with load ratings.

Probably something to do with safety margins.

[Martin]

In reality, how heavy is the Octavia?

The wagon is over 1400kg

[dArK5HaD0w]

Tare Mass (kg)....

147TSI Liftback - 1395
147TSI Liftback DSG - 1415
147TSI Wagon - 1410
147TSI Wagon DSG -1430

125TDI Liftback - 1430
125TDI Liftback DSG -1450
125TDI Wagon - 1445
125TDI Wagon DSG -1465

my build plate shows 1100kg for both front & rear axle....

[pwcar]

235 perhaps?

Yes, of course 235