06-29-2019, 09:47 PM | #1 |
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12mm H&R spacers on the rear only
i've had a full set of spacers setting in the garage for over a month as i couldnt decide if i wanted them at all, and if I did, which ones would I put on the front and which ones would i put on the back.
i searched all threads and read and researched... porsche sells some of their hi-perf cars with spacers, so i was like "ok ill do this"... but what seems to be most popular and "correct" on our car is larger spacers in the front and smaller spacers in the rear. i've seen maybe one post of pics of 10mm all around. but the 12fr/10rr seems to be whats done the most and has the most photos by far but my instincts told me i would either want the same size spacer on each wheel to keep it oem ratio, as some guys commented, or that i would want a wider track in the back only. when i saw BMS's advert with 12fr/15rr, i knew a wider rear was the call... the 12/15 looks pretty good but just a lil too froggy i think. and i have to pat myself on the back, 12mm only on the rear is perfect. - the rear wheels are flush with the fender, it looks much better.. and after 150 miles i can say that the rear track is only a hair wider and it handles just a hair better. a lil sturdier feeling. nothing negative and no compromise to report with my research i also found the reason guys do 12front 10 rear or even 15mm front and 12rear is not for performance at all. it is just to be flush with the fenders and the front fenders flare out a bit more than the rear so they push the front wheels out more with larger spacers to be flush in the front, too... but nobody else has said it, so i will: that is nonsense it is an example of "not seeing the forest for the trees", - meaning the guys are aiming to be flush with the fender so much so that they forget the rear needs to be the same width or wider as the front, not narrower, for handling. if all wheels are flush with their respective fender, but the front fenders of the car(like our f10m5's) are a bit farther out, you then mess up the wheelbase geometry of the car for the worse to chase a look that ironically ends up skewing the overall look - Aesthethically a wider track in the back is better and more athletic looking but they betray that fundamental aesthetic for an auxiliary aesthetic and then it has the wheelbase geometry of a forklift and sticking the fronts wheels out will sling everything up your sides, side mirrors and side windows.. i know that from other cars ive had. I couldn't find any pics of spacers only on the rear, so enjoy H&R 12mm rear only. stock suspension non-cp |
06-30-2019, 09:31 PM | #2 |
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Agreed. 12mm on the rear and nothing on the front actually looks quite good. My preferred combo is 10mm rear and 3mm front - clean, classy and perfectly balanced. IMO 15mm spacers on either end look like The Hulk trying to wear a shirt three sizes too small and bursting at the seams. Sometimes more isn't better.
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BeachM5nster273.50 |
07-01-2019, 07:22 PM | #3 | |
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as far as 3mm on the front, meh, my whole qualm with spacers on the front is just all the movement on the front. the rear is always locked in so i feel its less prone to any spacer issues. |
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07-01-2019, 09:49 PM | #4 | |
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I am solidly in the camp that doesn't agree with mounting 305/30R20 tires on the original 10" rear wheels but YMMV... FWIW, the narrowest wheel that Porsche has ever spec'd for this tire size is 11" and their higher performance models use 11.5" and 12" wheels with 305/30R20 tires. Last edited by FTP20; 07-01-2019 at 09:49 PM.. Reason: 1 |
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BeachM5nster273.50 |
07-01-2019, 10:14 PM | #5 | |
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good and valid info on the tires.. im just going on recommendations from other members thst said they grip a lot better but i have no exp or knowledge past other members that have done it. where you at M5theonlyone ? |
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07-02-2019, 02:54 AM | #6 | |
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07-02-2019, 09:07 AM | #7 |
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What do you not agree with there? In the new Michelin PS 4S they sound like they offer a lot more traction which would be helpful in the rear.
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07-02-2019, 10:28 PM | #8 | |
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and do you have a photo of your 305's? |
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07-02-2019, 10:39 PM | #9 | |
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The specs don't lie! 295/30R20 Pirelli P Zero Star BMW spec TREAD WIDTH 11.4" (measured on a 10.5" wheel) APPROVED RIM WIDTH 10" - 11" 295/30R20 Michelin Pilot Super Sport Star BMW spec TREAD WIDTH 11.6" (measured on a 10.5" wheel) APPROVED RIM WIDTH 10" - 11" 305/30R20 Michelin Pilot Sport 4S TREAD WIDTH 11.2". (measured on an 11" wheel) APPROVED RIM WIDTH 10.5" to 11.5" Porsche doesn't use min-11" rear wheels due to vehicle weight; the rear of an F10 M5 is heavier than the rear of any 991 variant and it is air pressure inside the tire that supports vehicle weight, not rim width. |
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BeachM5nster273.50 |
07-02-2019, 10:42 PM | #10 | |
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Going Faster!: Mastering the Art of Race Driving: The Skip Barber Racing School Bob Bondurant on High Performance Driving - 5th Edition |
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BeachM5nster273.50 |
07-02-2019, 11:21 PM | #11 |
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It looks good and I see whatcha mean about the "stance" of the car. I personally have 12 fronts and 10 mm rear and the car handles just fine. I've taken it out for a few autocross events and even two skid pads events and car is loving it.
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BeachM5nster273.50 |
07-03-2019, 03:18 AM | #12 | |
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The slow in, fast out refers only to a rear drive (even 4wd) 911. Entering a corner too fast and applying throttle too much is a passport to a spin followed by impacts due to loss of control.This is unlikely to be the scenario with a front engined rear drive M5 which would be more forgiving in such circumstances and much less likely to spin with the engine at the opposite end preventing the all too easy spin pendulum effect of a 911.Hope that explains it a bit more. Last edited by M5Rick; 07-03-2019 at 01:44 PM.. |
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BeachM5nster273.50 |
07-03-2019, 05:57 PM | #13 | |
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