Tecnomagnesio Wheel Fitment on Pre-A

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Frank Hood
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Tecnomagnesio Wheel Fitment on Pre-A

#1 Post by Frank Hood » Wed Dec 27, 2017 11:55 pm

I have a set of Tecnomagnesio wheels and I would like to know if anyone has them on their Pre-A. I am currently running 15X6 Fuch wheels with disc brakes and I want to go back to drum brakes with 15X5 Tecnomagnesio wheels. Before I swap everything back and find out I have to deflate the tires to install them please let me know if they will fit. The Fuchs fit without any issues due to the rotor/hub being smaller than the original brake drum and I fear I will not be able to get the Tecnos on/off without deflating the tires.

Thanks in advance for your help!
Frank

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Jules Dielen
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Re: Tecnomagnesio Wheel Fitment on Pre-A

#2 Post by Jules Dielen » Sun Dec 31, 2017 9:49 am

Hey frank, depends on what size tire you are installing. The rim itself will fit just fine but you'll have troule installing even a 155 size width tire. (That's about a 5.50 on a 16). 145R15 would most likely clear the rear fenders but it will look silly on a 5" rim.
Jules

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Frank Hood
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Re: Tecnomagnesio Wheel Fitment on Pre-A

#3 Post by Frank Hood » Sun Dec 31, 2017 7:21 pm

Jules

I'm thinking about 185/65/15 tires and have come to realize I may have to carry a portable compressor just in case.

Many thanks
Frank

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Jules Dielen
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Re: Tecnomagnesio Wheel Fitment on Pre-A

#4 Post by Jules Dielen » Sun Dec 31, 2017 9:52 pm

Frank,

with 99% certainty those will not clear even when completely deflated. There is simply not enough clearance between the drum and the rear wheel arch.
iI had to deflate thr 5.50x16s to get them to clear on my 52 (with stock 280mm drums), and that is about the width of a 155 radial. Highly doubt you will be able to squeeze a 185 in there. I have 185/70 15 on my 57A and those barely clear.

Happy New year to all!
Jules

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Randy Kaplin
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Re: Tecnomagnesio Wheel Fitment on Pre-A

#5 Post by Randy Kaplin » Mon Jan 01, 2018 12:41 pm

Have 5" alloy wheels (purchased from Wilhiot a few years ago) installed and the tires are Michelin 165 - 15". They are not Tecnomagnesio wheels but sure look similar. Pretty sure the tires need to be deflated to fit on the rear ... very tight clearance. Have to agree with Jules that you are dreaming to think 185 would ever clear the body, the 165 is really tight.
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Bob Slayden
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Re: Tecnomagnesio Wheel Fitment on Pre-A

#6 Post by Bob Slayden » Mon Jan 01, 2018 2:44 pm

Here are original 6" Technomagnesio's we just had installed on my son's '56 sunroof coupe by Franz Blam. (Look him up, Franz Blam Racing, 84 y/o Porsche factory trained back in the day.) It was quite a task, longer studs, spacers and the holes in the wheels had to be drilled to fit the standard diameter studs. No clearance issues except slight rub on full lock, a common issue with P185/65/15R tires.

Happy New Year,
Bob Slayden
Keep 'em on the road
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20180101_130033.jpg
Sorry about upside down image, it turns over when you click on it.
Technomagnesio 6inch on 1956 356a 2.jpg
They look super
Technomagnesio 6inch on 1956 356a 3.jpg
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Technomagnesio 6inch on 1956 356a.jpg
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20180101_130740.jpg
Tight but no rub. Can't get your little finger in there.

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Jules Dielen
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Re: Tecnomagnesio Wheel Fitment on Pre-A

#7 Post by Jules Dielen » Mon Jan 01, 2018 9:58 pm

Pre A's are a different animal, Bob. I ran 5.5x15 with 185/70/15 on my T1 with no problems. The rear axle goemetry on a pre A is different from a T1/ A
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Vic Skirmants
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Re: Tecnomagnesio Wheel Fitment on Pre-A

#8 Post by Vic Skirmants » Mon Jan 01, 2018 10:30 pm

Jules Dielen wrote:Pre A's are a different animal, Bob. I ran 5.5x15 with 185/70/15 on my T1 with no problems. The rear axle goemetry on a pre A is different from a T1/ A
The geometry is not different. The fender opening is much tighter.

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Jules Dielen
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Re: Tecnomagnesio Wheel Fitment on Pre-A

#9 Post by Jules Dielen » Tue Jan 02, 2018 1:25 am

Doesnt the lower bump stop for the spring plate limit travel a lot more on the pre A?
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Vic Skirmants
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Re: Tecnomagnesio Wheel Fitment on Pre-A

#10 Post by Vic Skirmants » Tue Jan 02, 2018 8:24 am

Yes. it limits the travel. That does not change the basic geometry.

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Jules Dielen
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Re: Tecnomagnesio Wheel Fitment on Pre-A

#11 Post by Jules Dielen » Tue Jan 02, 2018 12:36 pm

ok that is what i meant. Less travel, not as big an angle when you lift the car, so less room for a tire (in addition to the fender arch)
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Vic Skirmants
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Re: Tecnomagnesio Wheel Fitment on Pre-A

#12 Post by Vic Skirmants » Tue Jan 02, 2018 1:59 pm

Jules Dielen wrote:ok that is what i meant. Less travel, not as big an angle when you lift the car, so less room for a tire (in addition to the fender arch)
Exactly right.

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Steve Harrison
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Re: Tecnomagnesio Wheel Fitment on Pre-A

#13 Post by Steve Harrison » Wed Jan 03, 2018 2:21 am

Just knock a little off that stop where the spring plate hits with a small ziz wheel and it makes things a whole heck-o-a-lot easier as far as tires going on the rear. It doesn’t take much,...just a little bit because the stop is fairly close to the pivot point so by the time the extra travel gets out to the axle point the drop is magnified.

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Frank Hood
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Re: Tecnomagnesio Wheel Fitment on Pre-A

#14 Post by Frank Hood » Thu Jan 04, 2018 1:05 am

Thank you all for your knowledge and suggestions!

Not sure when I'll be going back to drum brakes but I'll be sure to post the outcome.

Thanks again
Frank

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Jules Dielen
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Re: Tecnomagnesio Wheel Fitment on Pre-A

#15 Post by Jules Dielen » Thu Jan 04, 2018 10:47 am

just go with the early Pre A 230mm drums. Easy access, but complete lack of stopping power. Can't win them all :(
Jules

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