ALFAGTV6.COM

[fly_lice]

Hi all,
I am looking to fit 225/45-16 tyres to some of the new style alfa alloys- offset 41.5, width 6.5.
The car is to be slightly lowered ~40mm and I will most likely get Yokohama A539 tyres (all tyres are not created equal).

I have read in previous posts that say 225's fit under GTV6 however they do not mention offset or if the vehicle is lowered.

Could you please put my mind at ease and let me know if they will fit, so that I can hand over the cash without fear of rubbing tyres..

Thanks guys, any response is appreciated.

[Micke]

I guess they will fit. Sorry this doesn't ease your decision much. I have two points leaning to the negative side, I'm afraid.

1) The ET is not very nice for the GTV. The tires will be far in especially in the rear.

2) The 6.5" rim is too narrow for the 225 tire. Minimum recommended rim is 7" with the range being 7.0-8.5"

[MD]

fly_lice
I run 225x45x16 on 7.5 wide rims and 35 offset. No problems.

Your rim size is not wide enough for a 225 tyre. Try a 205 should get you there.

[fly_lice]

Thanks for the reply's.

Last week I questioned several tyre fitting shops as to whether 225 would fit on 6.5, (I too did not think it would fit) and they assured me they would.
Hmm.. time to do the ring around again before hitting up Bris tyre shops..


I will look into this further... however, assuming that this size will fit, according to http://www.1010tires.com/WheelOffsetCalculator.asp Comparing MD's dimensions to my own. My wheels should give slightly more inside clearance... and therefore theoretically fit..


Your thoughts gentlemen?

[Micke]

There's fit and there's fit.

Of course they can be mounted on the rim. Even worse combo's can be used by grammy to drive to sunday church.

ETRTO makes the standards which I quoted. Some tire manufacturers don't follow these strict so next is to check with the tire manufacturer. The delers might know what thay are talking about. Then maybe....

Your rim will have more inside clearance, the tire not. I don't think inside is so critical and it's only some mm.

[Maurizio]

Look at
http://www.chris-longhurst.com/carbible ... bible.html

There is somewhere a tyre <-> rim combo calculator.

On my V6 I run 205/45/16 on a 8" wheel in the back and 195/45/16 on a 7" in the front. Choosing a relative small tyre, stretches the tyre wall and makes it less prune to flex over the walls, was my idea behind it.

[Daniel]

I'm with Maurizio on the tyre stretch theory.
I run 215/45R16s on 8" front and rear but I had to do some sculpting on the lower edge of the front wheel arches to give me clearance. My GTV is about 30mm lower.
I think the 225 is too large on a 6.5" wheel.
I am about to put a set of new spyder wheels on my dads GTV6 but will stick with 205 series tyres.
These wheels are 16x6.5" with 30.5 offset.

[fly_lice]

Thanks guys I appreciate the advice.

Yeah I will most likely get 205 series- which good because they are significantly cheaper as well.

Another painful decision for me awaits.. I have the possiblility of purchasing 17x7.5 offset 38. These should fit however to add to the problem they are being sold as a package with 215/45 17 rubber only.

Now I am pretty sure (not certain) that these rims will fit given the right rubber but I fear that with 215 I am going to run into trouble...

Does any one have this combination, or advice?
Sorry for giving this thread a long death.

[Daniel]

I tried running 225/50R16s which are about 630mm OD and nearly blew the guards off the car over a few bumps, admittedly, I have 30 offset.
The 215/45R17s have an OD of about 625mm, so 10-15mm larger than standard for a GTV and with 38 offset, (my standard GTV 15" had 45 offset as did the 90 wheels that I used) they may fit.

[Micke]

As the ET is pretty big they might fit. If you get them for the right price just go for it. Worst case you need to swap smaller tires up front and keep the 2 tires as spare rear tires. There they will fit anyway.

[MD]

Courtesy of Alfaowner.com

Wheel Offset

--------------------------------------------------------------------------------

Some info I found that some of you might like

Here you can see a table with the original off-set sizes:


Giulia (4-d) 42 mm
Bertone (63-76) 38 mm
Spider (66-93) 38 mm
AR Berlina 38 mm
Montreal 25 mm
Alfasud Serie 1 45 mm
Alfasud Super 45 mm
Alfasud ti Ser2 39 mm
Alfasud Serie 3 39 mm
Sprint (Sud) 39 mm
Alfetta, all 45 mm
Giulietta, all 45 mm
Alfa 33, all 39 mm
Alfa 75 1.6-2.0 45 mm
Alfa 75 2.5 40 mm
Alfa 75 TS/Turb 30 mm
Alfa 75 3.0 30 mm
Alfa 90 2.0 45 mm
Alfa 90 2.5 40 mm
Alfa 145/146
1.4/1.6/1.7 16V 43 mm
Alfa 145/146
T. Spark/Q/ti 50 mm
Alfa 155, Serie 1
(first model) 50 mm
Alfa 155, Serie 2
(wide aches) 41 mm
Alfa 156 41 mm
Alfa 164 TS/V6 40 mm
Alfa 164 24V 32 mm
Alfa 166 41 mm
Alfetta GT/GTV 45 mm
GTV 2.0 45 mm
GTV6 2.5 40 mm
Spider T.S./V6 35 mm
Spider V6 24V 31 mm
GTV T. Spark 35 mm
GTV V6 24V 31 mm

But then there is the additional thing about bolt circle.

Old Alfas have 4x108 mm.
Alfasud/33/75/90/145/146 have 4x98 mm
Big engine (TS, Turbo, V6) 75/90 have 5x98 mm
147/156 have 5x98 mm
166 has 5x108 mm

The center hole has a diameter of 58,6 mm, but from the starting of the Fiat aera (1987) this size changed on new models to 58,1 mm.

If you find a new wheel which fits on a new Alfa, and you would like to use it on your Alfa 33, then you have to enlarge the center hole by 0,5 mm.

[Bart Slide]

Hi GTV6 enthousiasts,

The correct ET value for GTV6 2.5 is 45.

I have installed Compomotive CXN with 7.5x16 inch ET27. Tires are 205/50/16 in front and 225/50/16 in rear. With a tuned 3.0 engine and a 75 3.0 QV gearbox it works quite well. I had to make small adjustments to the side wings else the tire would hit the side wing when fully turned the wheel to left or right. In back there are no problems.
I believe 17 inch rims do not match and belong this classic 80-ties car.