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Thread: Wheel advice

  1. #11
    Ravi, I just fitted the Maxi 7R's on my 72, I had to grind some off the calipers for clearance. Used 5/8ths spacer in rear, and 16 mm in front.
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  2. #12
    Senior Member NorthernThrux's Avatar
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    Quote Originally Posted by edmayo View Post
    Ravi, I just fitted the Maxi 7R's on my 72, I had to grind some off the calipers for clearance. Used 5/8ths spacer in rear, and 16 mm in front.
    That's useful info Ed. Did you have to grind the rear callipers for the 7R? I'd be surprised, but in which case it is a no go for me. Or are you only grinding at the front with the bigger caliper? I can easily insert a finger around front and rear callipers and wheel with my S callipers and Flat 6s. So surprised that grinding is needed anywhere. Not going to do mods that I can't reverse easily. 5/8" is essentially 16 mm. Why the different spacers front and rear? And finally 16 mm seems a lot, with a risk of fender rubbing. What was the min clearance you needed in the rear? Did you just want the face of the tires to match front to rear? Is that why you chose the same spacers (effectively)?

    Sorry for the barrage of questions.

    Ravi
    Early 911S Registry # 2395
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    2015 Porsche Macan S in agate grey 7sp PDK

  3. #13
    Had to grind both front and rear calipers, just seems to be too much material in the inner barrel of the wheels, maybe because they're cast instead of forged and rolled. Have to admit I wasn't expecting that, I wanted to stop using the modified steel wheels because they don't balance well, and I need to drive on these wheels to Parade and I need the sevens for my autocross tires. Yes, basically same spacer frt/rr. but using what I had laying around, solid rear, combos in front. Of course longer studs are also needed.
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  4. #14
    Serial old car rescuer Arne's Avatar
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    OK, that's very disappointing. If caliper mods (even a slight clearancing) are required, these vendors (especially a Porsche specialist like Stoddard) should make that obvious before selling them.
    - Arne
    Current - 2018 718 Cayman, Rhodium Silver, PDK

    Sold - 1972 911T coupe, Silver Metallic; 1984 911 Carrera coupe, Chiffon white; 1973 914 2.0, Saturn Yellow; 1984 944, Silver Metallic

  5. #15
    Senior Member NorthernThrux's Avatar
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    Quote Originally Posted by Arne View Post
    OK, that's very disappointing. If caliper mods (even a slight clearancing) are required, these vendors (especially a Porsche specialist like Stoddard) should make that obvious before selling them.
    Indeed, very disappointing. I also see why some people extend Deep 6s by an inch inboard to make a 7R. That probably solves the caliper clearance issue. I need to call Stoddard and cancel my order if this is the case. Being Memorial day, I imagine they are closed.

    It's really odd that I've not read about this 7R issue elsewhere and I have scoured the internet. But maybe most of those 7Rs are originals or the extended barrel 6s?


    EDIT: I guess an alternative is that if the Maxi Deep6 fits fine is I can still do CN36 in the 185/70 and 215/60 on that rim according to Pirelli's allowable rim widths. No fuss, no muss with spacers and pressing in new 7 mm longer lugs. But if their 7R doesn't fit in diameter, who knows if their Deep 6 does?
    Last edited by NorthernThrux; 06-01-2021 at 02:11 AM.
    Early 911S Registry # 2395
    1973 Porsche 911S in ivory white 5sp MT
    2015 Porsche Macan S in agate grey 7sp PDK

  6. #16
    Senior Member frederik's Avatar
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    I have a set of 6" Maxilite wheels on my Targa, unfortunately not with the nice satin finish. My restorer didn't mention anything about grinding down the calipers and they seem to clear very well. I am on a slow hunt for a nice set of original 6" Fuchs wheels because they just look better.

    Ravi, why use 7" in the back, and not 6" all around for a more stock look?

    Another thought: your lovely XWX tires will need replacing after 5-6 years anyway even if you don't use them.
    Last edited by frederik; 06-01-2021 at 04:04 AM. Reason: More thoughts
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  7. #17
    Senior Member NorthernThrux's Avatar
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    Frederick, that is a good point about the XWXs. Time flies. I bought them 7 years ago using money my dad gave me for my 50th birthday. At the time they were 2 plus years old (date code 3812) so their lifetime is rapidly coming to an end. I’m very attached to them because my dad never gave me a penny my entire life, so it was odd that he wrote me a cheque for 5 tires on this one occasion. But at some point they won’t be any good, especially for enthusiastic driving.

    I had a call this morning from my local tire guy who said the CN36 N4s I ordered online are no longer made and out of stock in Canada even at Pirelli. N5s won’t be available for a few months. So that may be the option to pursue for next springs driving season.
    Last edited by NorthernThrux; 06-01-2021 at 04:40 AM.
    Early 911S Registry # 2395
    1973 Porsche 911S in ivory white 5sp MT
    2015 Porsche Macan S in agate grey 7sp PDK

  8. #18
    Senior Member NorthernThrux's Avatar
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    Longstone in the UK has fresh CN36 185/70R15s, date codes in the past few months.

    One last question for the experienced. The 215/60R15 CN36 has a range of allowable rim widths from 6"-7.5". Which means that in theory it can go on my 6" rims and since it will protrude 15 mm further inside and out, it should fit. Haven't found any info on this anywhere.

    I do spin my rear wheels accelerating out of tight corners sometimes, so this is why I keep coming back to a slightly wider rear tire. But the better solution may be a LSD and keep the stock widths.

    Thoughts?
    Early 911S Registry # 2395
    1973 Porsche 911S in ivory white 5sp MT
    2015 Porsche Macan S in agate grey 7sp PDK

  9. #19
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    A little late to the party, but I switched to the 6Rs/7r set-up over the winter. Real 7Rs though. Maybe bad logic, but I figured the maxlites would just be burning money, while it seems like the 7Rs hold their value pretty well. Roth sport sells some insane CNC’d 7Rs, but the price is pretty much the same as a “reasonable” set of real 7Rs. I was told the flat 7s would be fine in back with either a little higher ride height or modest amount of rolling, so maybe flat 6’s and 7’s would be the best approach?

    I ran into the same problem with the CN36, so I had the sprint classics put on. Lots of moving parts, but relative to where I was last year, the grip level is nuts. I’ve been on the track, and generally drive like a lunatic, but haven’t reached the point where I am losing grip yet (I’ll be on the skid pad Saturday, so trust me, it will be found!)

    You’ll also see I am running 185 front and back. The 215 in the rear would require rolling the fender at my ride height, and the whole point of the 7Rs was to look stock and have a very stealth hot rod that looks more like a dentist’s car (not that there is anything wrong with that). The 185 on 6Rs rubs against my oil cooler (aftermarket) at extreme angles - I am confident that a 215 wouldn’t fit in the front unless the fenders were heavily rolled.

    Not certain any of that is helpful, but figured you might like to see how the car looks. To date, only one person - a total track rat - noticed that I have 7Rs.

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    MBR #3926
    '71 911 T Targa "Rick White"
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  10. #20
    Serial old car rescuer Arne's Avatar
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    Ravi, the 215/60s in back will change the handling balance of the car, giving a little more understeer. Hard to say how much, but a bit anyway. Whether that change is worth the possibility of less wheelspin and a slightly more aggressive look from the wider tires is a personal preference.
    - Arne
    Current - 2018 718 Cayman, Rhodium Silver, PDK

    Sold - 1972 911T coupe, Silver Metallic; 1984 911 Carrera coupe, Chiffon white; 1973 914 2.0, Saturn Yellow; 1984 944, Silver Metallic

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