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Thread: Wheel size and spacer for 7R ET49 fuchs

  1. #1
    Member A_Alfa's Avatar
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    Wheel size and spacer for 7R ET49 fuchs

    I want to put my 7R ET49 fuchs into the rear of my 1972 911E.

    I currently have standard ET36 fuchs and 195/65/15 Continental Premium Contact 2 tyres front and rear.

    I am deciding between 215/60/15 and 205/60/15, I would prefer 215 size.

    My car has standard flares and is a little bit lowered vs european height, I do not want to modify the flares.

    Did some research and:

    A. The 215/60/15 is 0,8% larger and considering also the ET change the edge of the new tyre will be 23mm closer to the inside of the wheel well and suspension components, and 3mm further in from the edge of the bodywork.

    B. The 205/60/15 is 1,1% smaller and considering also the ET change the edge of the new tyre will be 18mm closer to the inside of the wheel well and suspension components, and 8mm further in from the edge of the bodywork.

    My Porsche mechanics says 215 will work with 7mm spacers.

    What are your opinion experience with this change, will 215 work or will it rub with the 7Rs?

    thx. Arturo
    Early S Reg. #1263
    72911E
    95993
    02986S

  2. #2
    Tires of the same size can actually be a few millimeters different in width. One brand might work where another won't. But measure your existing clearance. If you will need 23mm clearance on the inside with that spacer, and you have 30mm, all should be well. There remains the possibility that the 215 will rub on the outside because of your lowering. Probably best to mount the tires, glue a bit of sponge or something similar to the inside of the fender up 30-50mm from the lip and drive carefully around the block. Check the sponge. If ok, take another slightly more vigorous ride and check again. Keep checking till you know the tire isn't going to rub. If it does rub, you need to raise the body, or add some negative camber, or get smaller tires or a thinner spacer (if you have space to the inside).
    There will need to be some testing to be sure you're ok.
    Last edited by jameshtaylor; 07-15-2014 at 10:58 AM. Reason: add info
    jhtaylor
    santa barbara
    74 911 coupe. 2.7 redone by Competition Engineering; ported to 36mm, shuffle-pinned, boat-tailed, Elgin mod-S cams, J&E 9.5's, PMO's.
    73 Targa (much beloved, sold and off to a fine new home in San Francisco)

  3. #3
    Arturo with a non-flared narrowbody LWB the conventional wisdom is to use a 225 tire with a 10mm spacer for ET -39. Whether it rubs is also a function of how much negative camber you are accomodating in the rear.
    1966 911 #304065 Irischgruen

  4. #4
    good advice from jameshtaylor.

    From experience in trying to use 7Rs or 8" rims at the rear of my narrowbody '72 - I ended up road testing a series of spacer and camber combinations to make sure there wasn't a rub. What looked ok on the hoist wasn't always the case when we road tested it. I used a combination of chalk on the tire and cloth tape against the body (both fender lip and inside frame) to test it but a sponge may also work.
    1972 911 Narrow-Body Group 4 Project - On The Road.

  5. #5
    I am also about to put 7R rims with 215/60-15 tires (Avon CR6-ZZ) on a 1970 Coupe. The final test will be done next week but a first trial on another car showed that with an 11 mm spacer the tire got very close to the inner fender, while with 15-18 mm is would rub the outer fender. However, as said before this is closely related to camber and individual body tolerances.

  6. #6
    Member #226 R Gruppe Life Member #147
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    I installed the factory +10mm wheel studs, the factory 7mm wheel spacers and 205/60 tires. Not the biggest tire combo but it worked great. Also no need to remove dust covers on front struts. Gled

  7. #7
    Senior Member Harvey Weidman's Avatar
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    We have used 15mm spacers on dozens of 7Rs with 215/60 street tires (NOT AVON-way bigger tire) on LWBs.
    The ideal is 12mm but we use bolt to bolt spacers and the smallest they come in is 15mm...17mm rubs...
    12mm with long bolts is the best if you are going to use longer studs.
    Less than 12mm and you have to watch out for oil lines and alignment bolts.
    IMHO
    H

  8. #8
    Senior Member 210bhp's Avatar
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    I have 7R's with 15mm wheel adapters and Avon cr6zz 215/60 tyres on the rear of my 73E with no modifications. Just been to Cassic Le Mans and back, 1500 miles. Great run.

    Regards
    Mike
    RS#1551(sold)
    67S
    73E (home after 25 years) and sold again
    Early S reg. #681

  9. #9
    Member A_Alfa's Avatar
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    This is a great place. Thanks all for the really useful input as always.

    I am going to start with the 7mm and 205/60 as I have the spacers and do not want to change the bolts now, and in the next change once the new front oil cooler lines are installed will consider 215/60 new bolts and 12 spacers or bolt on 15mm spacers.

    thx. Arturo
    Early S Reg. #1263
    72911E
    95993
    02986S

  10. #10
    Quote Originally Posted by Harvey Weidman View Post
    We have used 15mm spacers on dozens of 7Rs with 215/60 street tires (NOT AVON-way bigger tire) on LWBs.
    The ideal is 12mm but we use bolt to bolt spacers and the smallest they come in is 15mm...17mm rubs...
    12mm with long bolts is the best if you are going to use longer studs.
    Less than 12mm and you have to watch out for oil lines and alignment bolts.
    IMHO
    H
    Harvey, what's your experience with 7Rs w/ 12mm spacers and Avon 215/60 on a SWB with rolled rear fenders?

    -M

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