I am due a tyre change soon. Would uprating my 225 x 45 R17 to say 235 (or wider) x 45 R17 give me a smoother ride in my 2017 1.5 TSi DSG Octavia?

 

Also would this help reduce the occasional tramping when pulling away on slightly greasy surfaces?

1 hour ago, YMe said:

I am due a tyre change soon. Would uprating my 225 x 45 R17 to say 235 (or wider) x 45 R17 give me a smoother ride in my 2017 1.5 TSi DSG Octavia?

 

Also would this help reduce the occasional tramping when pulling away on slightly greasy surfaces?

 

Most Octavia MK3s use 7Jx17 rims as you can see from the below link.

 

https://eshop.skoda-auto.cz/cs_CZ/hlinikove-disky/c/alloyWheels?sort=priceAsc&q=%3AscoreDesc%3AcarType%3AOctavia%2BIII%2B%282017%2B%29&show=Page#

 

If you do have 7J rims, then the 235/45R17 size is not an allowed fitment as you need at least a 7.5J rim according to the tyre industry body called ETRTO (European Tyre and Rim Technical Organisation).

 

VW/Skoda online parts catalogue

http://www.oemepc.com/skoda/part_single/catalog/sk/markt/CZ/modell/OCT/year/2016/drive_standart/753/hg_ug/601/subcategory/601070/part_id/2543668/lang/e

 

In any case, 235/45R17 won't significantly improved ride comfort compare to 225/45R17. For a noticeably better ride, you need to go down to 205/55R16 wheels.

 

The Toyo link below shows that you need a rim at least 7.5J for the 235/45R17 tyre size. The tyre manufacturers don't decide what rim width any given tyre size can be fitted to, as that's ETRTO's job.

PROXES CF2

New Proxes CF2 has been created to take advantage of the latest materials, structures and tread pattern design in order to guarantee a high level of safety, durability, savings, and comfort.

	Tire Size	Tread Depth (mm)	Overall Diameter (mm)	Overall Width (mm)	Approved Rim Width Range (inch)
	235/45 R17 94V	8.3	644	236	7.5-8-9.0

 

https://www.toyo.co.uk/tirefinder/index/width/235/aspect/45/rim/17

 

A good all-season tyre such as Vredestein Quatrac will help stop the tyres spinning when pulling away in greasy conditions, although this is a known problem with some 1.5TSI DSG cars.

 

https://www.camskill.co.uk/m139b0s8003p202105/Vredestein_Tyres_All_Season_Car_Vredestein_Quatrac_6_-_205_55_R16_91V_TL_Fuel_Eff_%3A_C_Wet_Grip%3A_B_NoiseClass%3A_2_Noise%3A_70dB

 

Edited 5 July, 20214 yr by Carlston

9 hours ago, YMe said:

I am due a tyre change soon. Would uprating my 225 x 45 R17 to say 235 (or wider) x 45 R17 give me a smoother ride in my 2017 1.5 TSi DSG Octavia?

Also would this help reduce the occasional tramping when pulling away on slightly greasy surfaces?

 

No

 

Picking a tyre more suited to the conditions will help traction. A softer tyre, 16" wheels or better dampers may help the ride but it is well known there is not a great deal to be done to the torsion beam suspension. 

 

If you go outside the standard tyre size be sure to check your insurance don't consider it a modification

There's more to it than simply having a wider tyre.  Go too wide and the height will go up too much so you have to compensate by dropping the profile.  Often when going lower profile the sidewall will be stiffer making it harsher.  Also the bigger tyre will weight more so may feel harsher.  You could consider going smaller.  205/50/17 is similar in rolling diameter to the stock 225/45/17 and may well have a softer sidewall.  It would also fit the 7inch wide rims/

 

If comfort is your priority then go down a load rating while keeping it within the specs for the car and maybe choose a tyre that is know for being softer.  Uniroyal rainsports are quite soft I think.  Just be ready for higher fuel usage and faster wear.

Ideally you need to alter your dampers to something that is better damped. Ideally you want a firm dampers with softer spring to get a comfortable ride. However that isn't possible unless you get springs made to your spec and that will be costly. 

I fitted Koni FSD on my Fabia VRS along with eibach springs and that made the ride very compliant on bumpy roads. But you could still push on and they would firm up. Mighy be an option to think about but it will cost just under a grand to sort it.

As for axle tramping try not to apply too much power with the wheels all at once and best as you can, feed the power in. I know it is not as easy as wired throttles of old. You could also consider a remap with a linear throttle map.