235/45/17 - Fiat Coupe Club UK

Posted By: Anonymous

235/45/17 - 25/08/2010 20:25

will 235/45/17 be ok on 20vt

Posted By: Anonymous

Re: 235/45/17 - 25/08/2010 21:06

I think it would cause rubbing on full lock, or in compression if your car is lowered.

Std 20vt rim/tyre combo is
205/50r16 - overall diameter 611mm,
225/45r16 - 609mm

so 235/45r17 - 643mm, or +5% over the stock size

I have 215/45r17 (625mm, +2,6%) and it scrubs gently on full lock.

On the other hand, some 16vT came with 205/55r16 (631mm) and don't think anybody had problems (on a 16vT)... must be slightly different suspension geometry...

Posted By: DaveG

Re: 235/45/17 - 26/08/2010 07:49

I've got 225/45x17 and I find on full lock turning left they rub, and sometimes there would be some obvious rubbing npise even when driving in a straight line, but couldn't even see any signs of rubbing on the tyres. The slats in the front part of the wheel arch liners both side have some small signs of wear, however my car is lowered a bit (on FK's) and that might make a difference.

The 225/45x17's are 3.7% larger diameter but one advantage is that the speedo error is much reduced (eg: 70mph by sat nav = 72 on speedo instead of 75 with OE size)

I had 215/45x17 on these wheels before (on standard springs/shocks) and had no problems. 235's are also wider of course and I would say that they would be a step too far, stick with 215/45 or 225/45 as a max.

In fact 225/40x17 are almost the same outer diameter as OE, and in theory 235/40x17 would be OK but you may need spacers.

Posted By: Trappy

Re: 235/45/17 - 26/08/2010 10:12

Here's some data covering most of the tyre sizes thus far mentioned. The assumed inaccuracy of the standard tyre size is a 5% under-read.

Code:

										
Tyre/ wheel size..........	205/50/16	225/45/16	205/50/17	215/40/17	215/45/17	225/40/17	225/45/17	235/35/17	245/40/17	235/45/17
Tyre Width (mm)..........	205	225	205	215	215	225	225	235	245	235
Tyre Profile (%).........	50	45	50	40	45	40	45	35	40	45
Tyre Size (inches).........	16	16	17	17	17	17	17	17	17	17
Tyre Sidewall (mm).......	102.5	101.3	102.5	86.0	96.8	90.0	101.3	82.3	98.0	105.8
Inaccuracy (mph)........	66.5	66.2	69.3	65.6	68.1	66.6	69.0	64.7	68.3	70.0
										
Circumference (inches)	75.6	75.3	78.7	74.6	77.3	75.6	78.4	73.7	77.6	79.5
Circumference (mm)...	1923.3	1915.4	2003.2	1899.6	1967.1	1924.7	1995.4	1876.0	1975.0	2023.7
Diameter (inch)..........	24.1	24.0	25.1	23.8	24.6	24.1	25.0	23.5	24.7	25.3
Diameter (mm)...........	612.2	609.7	637.7	604.7	626.2	612.7	635.2	597.2	628.7	644.2
										
Tyre Size Inaccuracy	0.00%	0.41%	-3.99%	1.25%	-2.23%	-0.07%	-3.61%	2.52%	-2.62%	-4.96%
Combined Inaccuracy	0.0%	5.4%	1.0%	6.2%	2.8%	4.9%	1.4%	7.5%	2.4%	0.0%
Combined Accuracy...	95.0%	94.6%	99.0%	93.8%	97.2%	95.1%	98.6%	92.5%	97.6%	100.0%

Posted By: Rob

Re: 235/45/17 - 30/03/2012 10:40

Originally Posted By: DaveG

I've got 225/45x17 and I find on full lock turning left they rub, and sometimes there would be some obvious rubbing npise even when driving in a straight line, but couldn't even see any signs of rubbing on the tyres. The slats in the front part of the wheel arch liners both side have some small signs of wear, however my car is lowered a bit (on FK's) and that might make a difference.

The 225/45x17's are 3.7% larger diameter but one advantage is that the speedo error is much reduced (eg: 70mph by sat nav = 72 on speedo instead of 75 with OE size)

I had 215/45x17 on these wheels before (on standard springs/shocks) and had no problems. 235's are also wider of course and I would say that they would be a step too far, stick with 215/45 or 225/45 as a max.

In fact 225/40x17 are almost the same outer diameter as OE, and in theory 235/40x17 would be OK but you may need spacers.

Dave, I know this is an old thread but I've been busy with the search all morning and your scenario is the closest to mine that I can find.
I have just fitted a set of wheels which have some rather wide tyres on them. (245/35/17) Although I cannot hear any rubbing at slow speeds, driving in a straight line from 30 ish upward, I can definitely hear some kind of rubbing noise. At 1st I thought it may be the stupidly low profile giving me some road noise, but after driving to work this morning, i'm convinced it is rubbing. I have had a look at the tyres and like you, cannot see any obvious signs of rubbing.... Did you ever get to the bottom of what was causing yours?

It's worth pointing out that I have standard suspension!

Thanks.

Posted By: Rob

Re: 235/45/17 - 30/03/2012 10:44

Also worth pointing out that the wheels are 17x8J - 4x98 no spacers.

Thanks.

Posted By: Per

Re: 235/45/17 - 30/03/2012 12:00

I had 235/40-17 once and they were slightly too large. -45- is a lot bigger...

Posted By: Rob

Re: 235/45/17 - 30/03/2012 13:05

Thanks for your reply Per.
Where is the most common place to find rubbing in a straight line with tyres that are too big? I can't seem to find any evidence of rubbing anywhere.

Posted By: Per

Re: 235/45/17 - 30/03/2012 18:06

Most common should be rear arches.. But once you turn its the front inner liners!

Posted By: paulw

Re: 235/45/17 - 16/04/2012 19:49

I have 225/45/17 fitted on the new alloys (found the 2235/40/17 a little harsh on bumps on the old ones) and I do get some rubbing.

1. The inner liner on the off-side rubs a little on tight lock, but can live with that as it's very little.

2. Pretty sure its the rear wheel arch to rear of wheel that rubs sometimes in a straight line, depending on bumps and road undulations. It's a very close fit at the back compared to front arch!

Posted By: H_R

Re: 235/45/17 - 08/09/2015 22:51

Ok bit of a thread revival

Are there any alternative sizes that "dont Rub" when on B6 shocks and eibach springs for 17x7" pro race 1 alloys not sure of the ET but they clear the Brembos with a small gap but not tiny! (can you decipher the et from the alloy markings?) cannot actually see anything relating to ET

Trappy if you see this didn't quite get the data you posted! im guessing that if the overall diameter and width is the same as the standard 16" wheels there should be no problem
currently have 215/40/17 fitted so could i go up to 45 profile just to get a slight rise to clear ramps?

What have people done i have read a few saying they hear a rubbing noise when driving in a straight line! was there an outcome?
I know the tyre balance and handling thread slightly alluded to this but thought it was best to post here
Cheers