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Sergio
Alfa Sprint
Joined: 13 Mar 2003
Posts: 150
Location: Portugal
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 Posted: Thu Mar 13, 2003 7:13 pm Post subject: 15" wheels on 33 16v Qv |
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 I'm the first to post here
lol
Anyway, I was wondering what kind of offset would I need to fit 15" wheels (7" wide) with some 195/50r15 rubber, so that no involuntary rubbing goes around...
all the best
Sergio |
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Marcin
Alfa Sprint
Joined: 13 Mar 2003
Posts: 117
Location: Amsterdam
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| Posted: Thu Mar 13, 2003 7:22 pm Post subject: |
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Hi,
I had the wheels and tires you mentioned on my alfa for some time without any mods to the car. However you could use some stiffer rear springs, especially with two people on the back seat, not to mention anythink (anyone?) in the trunk.
Marcin
need to use to the new form of this forum... but it looks great! |
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Admin
Site Admin
Joined: 19 Feb 2003
Posts: 1223
Location: Stafford, UK
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| Posted: Thu Mar 13, 2003 8:30 pm Post subject: |
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Hi
Although there isnt a link to it, there is a list of the offsets for wheels on the 33 site:-
http://www.alfa-pages.co.uk/offset.htm
Just try and keep it about standard
All the best
Keith |
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Sergio
Alfa Sprint
Joined: 13 Mar 2003
Posts: 150
Location: Portugal
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| Posted: Fri Mar 14, 2003 11:13 am Post subject: Offsets |
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 Please correct me if I'm wrong.
The 33 has an original offset of 39mm, so if I place some 15"x7" wheels with a 35mm offset I shouldn't get any problems with rubbing on the inner parts like struts, shocks, etc. On the other hand if I decide to fit some wheels (teledials 15"x6") off a 145 QV (50mm) I will need some wheel spacers (about 15mm wide) to fit the wheels...
I'm not very sure about this...
All the Best
Sérgio |
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Admin
Site Admin
Joined: 19 Feb 2003
Posts: 1223
Location: Stafford, UK
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| Posted: Fri Mar 14, 2003 12:28 pm Post subject: |
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Hi
Pretty much. You want to keep the offset about standard, not only because of the tyres rubbing but also to avoid screwing up the suspension geometry. As I understand it, if you change the offset then you are changing where the stresses from the wheels are acting on the suspension (ie, if the wheels offset is 50mm different then the centre of the wheel is moved 50mm in towards the car, which will cause a large bending force on the suspension arms, along with extra stress on the wheel bearings)
All the best
Keith |
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Sergio
Alfa Sprint
Joined: 13 Mar 2003
Posts: 150
Location: Portugal
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| Posted: Fri Mar 14, 2003 12:55 pm Post subject: offsets |
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Thanks Keith,
Is it pretty much i'm right or pretty much I'm wrong?
Do you think a 35mm offset wheel to much? Sorry I'm bothering you... It's just a matter I don't understand very well, and I'm thinking of fitting 15" wheels because My rear wheels are squarish...
By the way, as I said in the email I sent you, I'll mail you on Monday.
Thanks again
All the Best
Sérgio |
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Admin
Site Admin
Joined: 19 Feb 2003
Posts: 1223
Location: Stafford, UK
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| Posted: Fri Mar 14, 2003 1:13 pm Post subject: |
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Hi
I am no expert on this, but I would think that only a 4mm difference would be acceptable, and should not cause any problems.
However it is probably worth keeping an eye on tyre wear and the wheel bearings for a while
All the best
Keith |
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Sergio
Alfa Sprint
Joined: 13 Mar 2003
Posts: 150
Location: Portugal
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| Posted: Fri Mar 14, 2003 1:17 pm Post subject: Offsets |
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Thank again Keith
All the Best
Sergio |
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micap
Alfasud
Joined: 14 Mar 2003
Posts: 62
Location: Denmark
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| Posted: Fri Mar 14, 2003 7:43 pm Post subject: |
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The offset on my Azev 7x15 rims is 30 mm, and it works just fine. But if I were you I would go with a slightly smaller offset, maybe 25, to get the rims all the way out in the arches. There are pictures of my car in the gallery.
Cheers
Michael
_________________
/Michael
ex 89 1.7 QV
now 85 1.5 QV with 1.7 engine. |
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Sergio
Alfa Sprint
Joined: 13 Mar 2003
Posts: 150
Location: Portugal
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| Posted: Sat Mar 15, 2003 7:41 pm Post subject: Offsets |
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Hi Michael
I'm sorry to ask you a stupid question but what do you mean by " to get the rims all the way out in the arches"?
Best regards
Sergio |
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sslim
Alfa Arna
Joined: 15 Mar 2003
Posts: 10
Location: hot, sunny singapore
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| Posted: Sat Mar 15, 2003 8:59 pm Post subject: Re: Offsets |
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you are right. 
original 33 14" wheels are 39mm offset, and the rear tyres are already quite close to rubbing the suspension.
so you can't run the 15" 145QV wheels with 49.5mm offset. if you want to run those wheels you will need to get a set of 12-15mm spacers for all 4 wheels, to get the offset out to about 34.5mm. give a few more mm of clearance because you will be running wider tyres, and the 145QV is also wider.
by the way, the lower the number in offset, it means how far the wheel will protrude out of the wheels arch. so if you run a 10mm offset wheel, your wheels and tyres will be out of the car body. 
i am running 15" wheels with 35mm offset, and 195/50R15 tyres, everything works great. my friend's 33 is running the 145QV wheels and he need spacers.
hope that helps. |
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Sergio
Alfa Sprint
Joined: 13 Mar 2003
Posts: 150
Location: Portugal
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| Posted: Sat Mar 15, 2003 10:18 pm Post subject: 15" wheels on 33 16v Qv |
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Thanks sslim, thats what I wanted to hear 
All the Best
Sergio |
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Admin
Site Admin
Joined: 19 Feb 2003
Posts: 1223
Location: Stafford, UK
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| Posted: Sun Mar 16, 2003 12:22 pm Post subject: |
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Hi
Some rwd cars will have negative offset wheels.
As I mentioned earlier it is important to keep the offset about correct, no because of clearance problems but to avoid overstressing suspension components
All the best
Keith |
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Sergio
Alfa Sprint
Joined: 13 Mar 2003
Posts: 150
Location: Portugal
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| Posted: Sun Mar 16, 2003 6:39 pm Post subject: |
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Hi Keith
Thanks again, I'll keep that in mind.
All the best
Sergio |
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Zep
Alfa Arna
Joined: 16 Mar 2003
Posts: 1
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| Posted: Tue Mar 18, 2003 11:20 am Post subject: |
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Guys,
I have fitted 7 x 17 plus 205/40/17 tyres. My offset is ET35, and the wheel is pretty close to the forward arm of the rear suspension.
There has been little adverse effect to the handling (in fact the extra grip is great), but a little tram linning can be felt on poor surfaces.
The effect on the handling should be your number one consideration. The additional stress, if any, is going to be well within the design limits of the suspension set up. The standard parts are well up to the stress of racing on slicks, so a little bit of offset will not make any difference.
Zep |
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Admin
Site Admin
Joined: 19 Feb 2003
Posts: 1223
Location: Stafford, UK
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| Posted: Tue Mar 18, 2003 12:08 pm Post subject: |
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| Zep wrote: |
| The additional stress, if any, is going to be well within the design limits of the suspension set up. The standard parts are well up to the stress of racing on slicks, so a little bit of offset will not make any difference. |
Hi
To an extent I think you are correct. However if the offset gets too far out then what would be an acceptable normal stress becomes a bending force on the suspension. Various parts of the geometry are designed to conicide around the centre of the wheel where it meets the road, and changing the offset means this will no longer be true. It will put extra stress on the wheel bearings and ball joint (along with stuff like the suspension arms that generally do not give problems on the 33).
While they can take the stress of racing on slicks, this is only for a tiny number of miles. For example there are loads of lightweight race wheels available for motorcycles which are fine for track use but cannot take the stress of road use for very long.
With a 35mm offset you are fairly close to standard and I would not expect that to cause a major problem
Some cars have had problems with collapsing suspension arms (Vauxhall / Opal Calibra for example I think) which are often blamed on poor quality replacement suspension arms. However it still takes a hell of alot of force to bend these arms
All the best
Keith |
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Guest
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| Posted: Tue Mar 18, 2003 12:39 pm Post subject: |
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Kieth,
I completely agree, and I think that in the end, the two go hand in hand.
If the offset is miles out, the handling will be crap, the forces will be going in the wrong places and the wheels will be hitting into all sorts of suspension parts or body work.
Zep |
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tvatavuk
Gold Cloverleaf
Joined: 13 Mar 2003
Posts: 673
Location: Split, Croatia
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| Posted: Thu Mar 20, 2003 4:09 pm Post subject: Re: offsets |
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| Sergio wrote: |
Do you think a 35mm offset wheel to much? Sorry I'm bothering you... It's just a matter I don't understand very well, and I'm thinking of fitting 15" wheels because My rear wheels are squarish...
Sérgio |
Hi Sergio,
I have 7x15" OZ Superleggeras ET 35 on my 33 16v Permanent 4, also friend of mine had 33 1.5 i.e with Momo 7x15 et 35mm rims. 195/50/15 tires
We both had problems with rear tire and even rim rubbing while very hard cornering of fully loaded, on to inner part of wheel spring mount.
3mm-5mm spacers did them almost right.
I say almost because now when fully loaded and hard cornering or bigger hole while speeding outer side of tire rubs wheel arch, or inner part rubs spring mount.
In any case with worn shocks even with distancers, it would touch.
Tino
_________________
Tino Vatavuk
Little black dress which replaced Alfa Romeo 33 S 16v Permanent 4 GMo |
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Sergio
Alfa Sprint
Joined: 13 Mar 2003
Posts: 150
Location: Portugal
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| Posted: Wed Mar 26, 2003 2:51 pm Post subject: offsets |
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Hi Tino
I'm thinking of fitting some tecnomagnesio Indianapolis wheels, that are 6,5x15" in size (I don't know the ET, but probably will be ET 35).
I was also thinking about fitting som michelins exalto 195/50R15.
Do you think I'll have any trouble?
BTW, I have new shocks all round (Monroe Reflex - Gas charged)
All the BEst
Sérgio |
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sslim
Alfa Arna
Joined: 15 Mar 2003
Posts: 10
Location: hot, sunny singapore
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| Posted: Wed Mar 26, 2003 8:42 pm Post subject: Re: offsets |
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"I have 7x15" OZ Superleggeras ET 35 on my 33 16v Permanent 4, also friend of mine had 33 1.5 i.e with Momo 7x15 et 35mm rims. 195/50/15 tires
We both had problems with rear tire and even rim rubbing while very hard cornering of fully loaded, on to inner part of wheel spring mount ...."
hi tvatavuk,
may i know if your car is lowered?
on my 33 16v sw, i am running the exact same size wheels, with same offset, and same size tyres but i don't think i have that problem. my car is not lowered.
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tvatavuk
Gold Cloverleaf
Joined: 13 Mar 2003
Posts: 673
Location: Split, Croatia
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| Posted: Thu Mar 27, 2003 10:50 am Post subject: Re: offsets |
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| sslim wrote: |
hi tvatavuk,
may i know if your car is lowered?
on my 33 16v sw, i am running the exact same size wheels, with same offset, and same size tyres but i don't think i have that problem. my car is not lowered.
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Hi SlimShady  ,
P4 has by factory settings highest rear, even higher then 8v 33s.
On the other hand next month it will be 11 years old, so springs aren't what they used to be.
As I said I had problems only with extrime cornering.
SW is somewhat different from Berinle version so that could be also reason why you don't have any problems.
Do you have problems or not is easy to see.
Take go to back of car, and take a look, at upper spring mount (or tube above which protects shock arm ), if you can see that part and it is polished or black, it is place where tire is rubbing.
Tino
_________________
Tino Vatavuk
Little black dress which replaced Alfa Romeo 33 S 16v Permanent 4 GMo |
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tvatavuk
Gold Cloverleaf
Joined: 13 Mar 2003
Posts: 673
Location: Split, Croatia
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| Posted: Thu Mar 27, 2003 11:07 am Post subject: Re: offsets |
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| Sergio wrote: |
Hi Tino
I'm thinking of fitting some tecnomagnesio Indianapolis wheels, that are 6,5x15" in size (I don't know the ET, but probably will be ET 35).
I was also thinking about fitting som michelins exalto 195/50R15.
Do you think I'll have any trouble?
BTW, I have new shocks all round (Monroe Reflex - Gas charged)
All the BEst
Sérgio |
Hi Sergio,
will they rub or not I can't tell you, rims of that size are usualy 7", but 195 tire will fit nicely on 6.5 also, because for 195 tire recomended rim is 6.0".
In case you experiance tire rubbing at back, with ET35, you could need some 3-5mm of spacers (i would recomend with hub ring for better centering)
I had Monroe gas-o-matic at rear  , and there is nothing good I can say about them, my rear bounced like basketball when new, and they failed in less then 3 years.
At the moment I have Koni sport (yellow at mid setting) at rear, and 2 problems I have with them is that they are oil kind (so compared to gas type they don't hold car at some level), and I can hear them "breath" when driving over bumps.
Of corse someone could say that they are to stiff 
About Pilot Exalto, some people here change them on half of their life time, not because they don't have grip any more, but because lagre amount of them at some point start to produce, terrible humming noise.
This of course depends on type of road surface.
Tino
_________________
Tino Vatavuk
Little black dress which replaced Alfa Romeo 33 S 16v Permanent 4 GMo |
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RpmHead
Alfasud
Joined: 13 Mar 2003
Posts: 52
Location: Oslo, Norway
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| Posted: Tue May 06, 2003 12:06 pm Post subject: Ronal A1 |
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What about 7x15" Ronal A1 on a 1992 33 QV 16V? 
Any experiences with that? The rims have a ET of 25mm...
The rims just suits the 33 so perfect, but I don't want to
destroy my bushings and bearings.
Regards,
_________________
Stian Henriksen, Norway
'92 33 QV S 16V
'66 Giulia Sprint GT Veloce
'69 Giulia Super |
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