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Discussion Starter #1
Standard tyre size is 235/35/18 on the GTA....most, including me, went for 225/40/18 as a cheaper replacement.

Just wondered if anyone had tried 235/40/18?

235/35 -> 225/40 is a 2.5% increase in circumference, putting the speedo out by close to 2mph but giving less tyre width (less grip, but less tramlining?)

235/35 -> 235/40 is is 3.7% increase in circumference, and putting the speedo out by 2.7mph. More grip, more tramlining.


My reason is, I don't like the "strech" on 225s, both in terms of look and rim exposure, plus the extra grip from 235's could be quite useful.

Anyone tried it?
 

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Standard tyre size is 235/35/18 on the GTA....most, including me, went for 225/40/18 as a cheaper replacement.
The 156GTA was always 225/40R18, the GT too.
Only the 147GTA had the totally unobtainable 235/35R18
 

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Discussion Starter #3
Bump on this as I'm due!

I see Trailbraker (used to?) use 235/40/18's, but if anyone has tried it, info appriciated as I don't want an expensive mistake!
 
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Yes, they will fit and look better than 225 imho. Hopefully you have some normal ET wheels and no spacers ;)
 

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Bump on this as I'm due!

I see Trailbraker (used to?) use 235/40/18's, but if anyone has tried it, info appriciated as I don't want an expensive mistake!
In the registration papers to my GTA I have 225/40 R18 and 235/35 R18 as aproved sizes. However as David says, you must be really lucky to get 235/35 as there is almost no choice and no stock.

I think 235/40 MAY need spacers but I am not sure. I bought the GTA with 235/35 R19 and they didnt scratch anything but needed 15mm spacers. However, I dont remeber what ET they were as they were not Alfa wheels....
 

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...However as David says, you must be really lucky to get 235/35 as there is almost no choice and no stock.
I checked on mytyres.co.uk today and they have Dunlop in that size for £244 each...!!!
 

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Discussion Starter #8
You can get the 35's, but they're stupidly expensive.

Don't see any reason why the 235/40's would cause serious issues in terms of clearance. I'm on coilovers on the Alfa (GT) multispoke wheels, but they're fairly recessed (I was considering spacers). Its not a massive increase in size.

I guess I'll just have to suck it and see ;)
 

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I agree there is no point looking at 235/35R18, availability and price makes it a crazy option and by the way that Dunlop is a Runflat so you can't use that unless to fit pressure monitoring anyway.

235/40R18 may fit, but what size rims are you putting them on?
 

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It's a no-brainer isn't it for the GT multispokes?
225/40/18, loads of choice, much cheaper and they definately fit with no rubbing etc.
 

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Discussion Starter #12
I've got the GT Multispokes as Alexandrus mentions.

Prices aren't that much more - my reasoning is down to looks and alloy protection, as the 225's are stretched over the rim.
 
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Plus, 235/40/18 is getting more and more common, most german manufacturers are switching from 225/40 to 235/40 so tyre manufacturers will follow ;)
 
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