7" Alloys

RUDDY · Postby **RUDDY** » 16 Sep 2008 21:06

Hi can someone help, what pcd and offset (ET) is required to fit 7" Minilite style alloys to a TR7, what is the recommeneded tyre size 195/55/13 ?

cheers, Paul

jeffremj · Postby **jeffremj** » 16 Sep 2008 22:19

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by RUDDY

Hi can someone help, what pcd and offset (ET) is required to fit 7" Minilite style alloys to a TR7, what is the recommeneded tyre size 195/55/13 ?
<hr height="1" noshade id="quote"></blockquote id="quote">I have ET10 offset with my 7" alloys. This is absolute max and will need the rear arch lip to be 'modified'. OK at front. I would go for 205/60x13 as this:

1) will keep the gearing close to the original 185/70x13
2) is an approved width for 7" - 195 is borderline
3) is an available size (is 195/55x13 available?)
4) is wider than 195 :-)

Beans · Postby **Beans** » 17 Sep 2008 22:05

Dunno ... [8)] Have 195/55x15 and 205/50x15 tyres respectively on both my cars and they both very slightly touch, but on the back of the RH side rear arch only. Rims are 7" wide with original ET of 25mm.

An ET of 10mm will put your wheels 15 mm further out. As for the wheel geometry at the back that won't do any harm. But at the front this will certainly change the suspension geometry and thus the handling characteristics of the car. How much depends on cars setup and your driving style.

<center>

1981 TR7 FHC Sprint (better known as 't Kreng)
1981 TR7 DHC (not very well known yet, but back on the road)
Also a 1980 TR7 DHC, 1980 TR7 DHC FI, 1981 TR7 FHC
http://tr7beans.blogspot.com/</center>

jeffremj · Postby **jeffremj** » 18 Sep 2008 18:32

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Beans

Dunno ... [8)] Have 195/55x15 and 205/50x15 tyres respectively on both my cars and they both very slightly touch, but on the back of the RH side rear arch only. Rims are 7" wide with original ET of 25mm.

An ET of 10mm will put your wheels 15 mm further out. As for the wheel geometry at the back that won't do any harm. But at the front this will certainly change the suspension geometry and thus the handling characteristics of the car. How much depends on cars setup and your driving style.
<hr height="1" noshade id="quote"></blockquote id="quote">Something is seriously wrong here and, unless it is Compomotive, here is the proof:

ET10 is what I am using and I only got slight rubbing at the rear with unmodified arches and unmodified axle. With the lip 'adjusted' there is no rubbing. Don't forget that if a 6 inch rim has ET25 (and just fits without rubbing) and you want to go to 7 inches, an ET25 will push the tyre 12.5mm into the rubbing area - you have to go to ET12.5 to keep the outer edge in the same place. Here is info from the compomotive site:

I rest my case.[8D]

frankman · Postby **frankman** » 18 Sep 2008 21:07

Hi Jeffrem

I do not agree it is 37,5mm ET, to keep the outer edge in the same place!

Hello from Switzerland

Frank

Beans · Postby **Beans** » 18 Sep 2008 21:16

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by Beans

...An ET of 10mm will put your wheels 15 mm further out ...<hr height="1" noshade id="quote"></blockquote id="quote">
The should read "will put the wheels centre line 15mm further out"
B.t.w. I don't doubt that it works on your car, it just won't on mine.

And of course tyre choice (the actual tyre width) is very important here. The 205/50 Yokohama's are actually slightly narrower when measured over the tyre wall then the 195/55 Dunlops ...

<center>

1981 TR7 FHC Sprint (better known as 't Kreng)
1981 TR7 DHC (not very well known yet, but back on the road)
Also a 1980 TR7 DHC, 1980 TR7 DHC FI, 1981 TR7 FHC
http://tr7beans.blogspot.com/</center>

jeffremj · Postby **jeffremj** » 18 Sep 2008 21:36

<blockquote id="quote">quote:<hr height="1" noshade id="quote">I do not agree it is 37,5mm ET, to keep the outer edge in the same place!
<hr height="1" noshade id="quote"></blockquote id="quote">I think you are correct [B)]

Very peculiar, I can't understand how there can be such a discrepancy. Perhaps someone machined my wheels? If so, erring on the side of caution would be to go with Beans' offset.

Beans · Postby **Beans** » 19 Sep 2008 17:52

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by jeffremj

[quote] ... Perhaps someone machined my wheels? ... <hr height="1" noshade id="quote"></blockquote id="quote">
That could be a possibility.
My Revolutions were delivered with the wrong ET (20 instead of 25)when I bought them. Turned out to be easier and cheaper to have 5 mm machined of.
Just measure one of the rims next time you need new tyres if you want to be sure.

Also bear in mind that the tolerances on the bodyshells are pretty large compared to modern standards.

<center>

1981 TR7 FHC Sprint (better known as 't Kreng)
1981 TR7 DHC (not very well known yet, but back on the road)
Also a 1980 TR7 DHC, 1980 TR7 DHC FI, 1981 TR7 FHC
http://tr7beans.blogspot.com/</center>

chuffer16 · Postby **chuffer16** » 26 Sep 2008 15:54

If anybody is interested I have a set of 13 x 7J Minilites I'm about to put on Ebay. I was told they would fit standard arches, and the front ones fitted with 215 Goodrich's do, look great and don't rub. But the rear ones fitted with 235 x 55 BF Goodrich tyres do on full suspension travel. Even with 205 width tyres they would as the rims appear to be flush with the body so extended arches would probably be required at the rear. The T dimension is 90mm and the equivalent front is 110mm. If you require more dimensions or information mail me on chris4elza@yahoo.com.
Cheers
Chris.

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7" Alloys

7" Alloys

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