Downsizing Rims

[sheffield]

I am thinking about down sizing the 300's 19" rims to 18", am i correct that changing from;

235/35 R19 Tyres on 8Jx19 ET50 Rims (OEM)

to

235/40 R18 Tyres on 8Jx18 ET?? -

Rims would maintain the overall diameter, and therefore wouldn't cause any errors in speedo reading etc.

Does anyone know if I would need to keep the offset the same, or what offset I would need to clear the brakes with 18" rims?

Has anyone changed their mk3 down from 19 to 18s?

 

[weasley]

Those two tyre sizes are pretty much exactly the same circumference (0.3% theoretical difference).

Offset is another matter. Ideally you would stay with the OEM offset, because this is about more than just brake and bodywork clearance, it is a part of the overall steering and suspension geometry and going away from OEM could lead to unexpected handling, especially in the case of a tyre deflation or blowout.

 

[JohnWB87]

Would be worth trying to find out what the 18s on the 265 where.


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[sheffield]

Those two tyre sizes are pretty much exactly the same circumference (0.3% theoretical difference).

Offset is another matter. Ideally you would stay with the OEM offset, because this is about more than just brake and bodywork clearance, it is a part of the overall steering and suspension geometry and going away from OEM could lead to unexpected handling, especially in the case of a tyre deflation or blowout.

Thanks, I currently have one of the OEM rims off the car as has a blowout down the m1 ayesterday, where would I be able to find the offset value?

Thanks

 

[Curtly]

Would be worth trying to find out what the 18s on the 265 where.


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225/40 r18 taking off the brochure

 

[Curtly]

I'll happily swap my 18's lol

 

[misiakupatego]

Check Borbet BS5 18"

ET50, 8Jx18, 225/40

On Cupra 265:

Anybody see noticeable comfort change when swapping from 19" to 18" in Cupra?

 

[sheffield]

Check Borbet BS5 18"

ET50, 8Jx18, 225/40

Is the ST your car? Have you changed down?

 

[misiakupatego]

No, I have Cupra 300, photo from https://www.seat-online.nl/showthre...-verfraaiingen&p=417690&viewfull=1#post417690

I think about these Borbet for winter setup.

 

[billman]

According to this it's 225/40/18 7.5×18 ET51 for the cupra 265.

https://www.wheel-size.com/size/seat/leon/2014/#trim-20tsi-cupra-265-eudm

 

[mardon]

Here's an image of my 265 rims.

I'm comfort mode the car rides very nicely.

 

[sheffield]

According to this it's 225/40/18 7.5×18 ET51 for the cupra 265.

Thanks, useful website! I was planning on keeping the width the same at 8" to keep the grip!

 

[rryans11]

Thanks, useful website! I was planning on keeping the width the same at 8" to keep the grip!

I've been running my 280 on 18's from purchase and I've no problems at all. She's running on 225/40/18 tyres, wheels are 18x8j ET45 BBS SRs'

Also no real issues with grip, she lifts well from a standstill with no axle tramp unless you mash the throttle to the floor in first.

 

[Walone]

Thanks, I currently have one of the OEM rims off the car as has a blowout down the m1 ayesterday, where would I be able to find the offset value?

Thanks

Should be on the inside of wheel, usually on the spokes, with the wheel size etc.

 

[sheffield]

If dropping from a 50 ET to a 45 ET, how beneficial/needed would 5mm spacers be?

Both rims being 8" diameter.

 

[eltawater]

If you go from ET50 to ET45, doesn't that mean the rims will stick out more from the wheel arch? So adding spacers is going to stick out even further?

 

[g_berserk]

Would be worth trying to find out what the 18s on the 265 where.


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225/40/18 tires and 18x7.5J et+51 for stock wheels on the 265

 

[sheffield]

If you go from ET50 to ET45, doesn't that mean the rims will stick out more from the wheel arch? So adding spacers is going to stick out even further?

I thought the larger the offset, the further away from the car the centre line of the rim would be?

Am I getting it the wrong way round?

 

[eltawater]

https://shopdap.com/wheel-offset-explained/

 

[Biker]

If you go from ET50 to ET45, doesn't that mean the rims will stick out more from the wheel arch? So adding spacers is going to stick out even further?

Absolutely spot on mate!

It seems wheel offsets is a subject that confuses many........