Pushing the E61 limits, fitting 19x11 rears.
02-13-2015, 09:52 AM
#1
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Pushing the E61 limits, fitting 19x11 rears.
I am quite the rebel when it comes to E61 fitment, wheel companies and vendors tell me "that won't fit" like it's going out of style. I love the challenge, I love the calculations, I love proving them wrong, but more than anything I love proper fitment.
Last winter when I was living in Oakland the abrasive highways really took a toll on my wheels and one of my rears is flatted/torqued beyond repair. I was aware that my wagon took some harsh blows while driving but was hoping the "flow-formed" construction would of held up better but unfortunately that wasn't the case. Instead of buying a single replacement 19x10 rear, I implemented my "don't just replace... upgrade!" technique I often use on my car.
Forgestar now offers 19x9.5, x10, x11, and x12 in SDCs, when I placed my original order 19x11 wasn't an option, now that it is I will be replacing my 19x10 rears with 19x11s. I spent yesterday remeasuring my current offsets and running the rear with different spacer configurations to get some real-world driving experience with possibly offsets.
Shortly after ordering my original 19x9.5 and 19x10 wheels I upgraded my brakes to the oem M5 system with M5 rear hubs which lower the offsets by ~20-22mm. My bespoke offset wheel I just ordered will now require a 20mm spacer lol
But this did allow me to complete some useful testing while running my rears without the spacers to check inner liner/body clearance.
The results are: its TIGHT. With the wheels unweighted the inner wheel lip and tire actually press into the wheel liner as the lug nuts are tightened and there is friction as the wheels is spun while mounted (in the air). I also intentionally lowered my rear air suspension via INPA to increase the likelihood of components contacting each other. When the car is dropped the camber saves the day and creates maybe 8-10mm of clearance. Driving around town and on the highway (intentionally driving aggressively over everything rough) I could not notice any additional rubbing, under large compressions my current setup rubs slightly but forces this large occur very rarely and rubs occur less than 5% of the time while driving.
When the rear wheels were removed there was some slight marks there the tire contacted the inner liner under full compression and also some marks on the panel which covers the box for the brake pad wear sensors. Nothing that was overly concerning since it was all plastic and would wear down over time. There is a little bit of cushion before the any serious contact would happen, I am not sure if wheel-body contact is even possible and if it is it would only be under a really gnarly impact where everything is bottomed and shit is hitting the fan. So I used the 19x10 w/out spacer as my medial reference.
I then threw the 20mm spacer back on and added a 3mm, I couldn't swing it with my current setup but I have a 275/35 on the 19x10 but on my 19x11s I will run the same tire so stretch should be juuuuuuust enough to clear the fender and bumper when compressing. Anyway with my friend Online Wheel and Tyre Fitment Calculator. Offset, Tyre Stretch and Speedo Error | Will They Fit and a lot of Type-A measurements and calculations I placed my order with Forgestar this morning. As traction is not an issue for me in FBO trim with xi, I did this purely as an aesthetic modification. I had aspirations to upgrade tires to 45 up front and 40 in the rear but unfortunately I just don't think there is room for the added meat.
Since I freshened up with my measurements, here are my current specs:
19x9.5 et24 + 5mm = et19 245/40/19
19x10 et24 + 20mm= et 4 275/35/19
Soon to be:
19x11 et12 275/35/19
Evan
Current fitment for reference, 19x11s will bee the business!!!
20mm spacer removed, 19x10 et25 M5 hubs
19x10 et4 (current)
19x10 et1
et4
et1
Last winter when I was living in Oakland the abrasive highways really took a toll on my wheels and one of my rears is flatted/torqued beyond repair. I was aware that my wagon took some harsh blows while driving but was hoping the "flow-formed" construction would of held up better but unfortunately that wasn't the case. Instead of buying a single replacement 19x10 rear, I implemented my "don't just replace... upgrade!" technique I often use on my car.
Forgestar now offers 19x9.5, x10, x11, and x12 in SDCs, when I placed my original order 19x11 wasn't an option, now that it is I will be replacing my 19x10 rears with 19x11s. I spent yesterday remeasuring my current offsets and running the rear with different spacer configurations to get some real-world driving experience with possibly offsets.
Shortly after ordering my original 19x9.5 and 19x10 wheels I upgraded my brakes to the oem M5 system with M5 rear hubs which lower the offsets by ~20-22mm. My bespoke offset wheel I just ordered will now require a 20mm spacer lol
But this did allow me to complete some useful testing while running my rears without the spacers to check inner liner/body clearance.
The results are: its TIGHT. With the wheels unweighted the inner wheel lip and tire actually press into the wheel liner as the lug nuts are tightened and there is friction as the wheels is spun while mounted (in the air). I also intentionally lowered my rear air suspension via INPA to increase the likelihood of components contacting each other. When the car is dropped the camber saves the day and creates maybe 8-10mm of clearance. Driving around town and on the highway (intentionally driving aggressively over everything rough) I could not notice any additional rubbing, under large compressions my current setup rubs slightly but forces this large occur very rarely and rubs occur less than 5% of the time while driving.
When the rear wheels were removed there was some slight marks there the tire contacted the inner liner under full compression and also some marks on the panel which covers the box for the brake pad wear sensors. Nothing that was overly concerning since it was all plastic and would wear down over time. There is a little bit of cushion before the any serious contact would happen, I am not sure if wheel-body contact is even possible and if it is it would only be under a really gnarly impact where everything is bottomed and shit is hitting the fan. So I used the 19x10 w/out spacer as my medial reference.
I then threw the 20mm spacer back on and added a 3mm, I couldn't swing it with my current setup but I have a 275/35 on the 19x10 but on my 19x11s I will run the same tire so stretch should be juuuuuuust enough to clear the fender and bumper when compressing. Anyway with my friend Online Wheel and Tyre Fitment Calculator. Offset, Tyre Stretch and Speedo Error | Will They Fit and a lot of Type-A measurements and calculations I placed my order with Forgestar this morning. As traction is not an issue for me in FBO trim with xi, I did this purely as an aesthetic modification. I had aspirations to upgrade tires to 45 up front and 40 in the rear but unfortunately I just don't think there is room for the added meat.
Since I freshened up with my measurements, here are my current specs:
19x9.5 et24 + 5mm = et19 245/40/19
19x10 et24 + 20mm= et 4 275/35/19
Soon to be:
19x11 et12 275/35/19
Evan
Current fitment for reference, 19x11s will bee the business!!!
20mm spacer removed, 19x10 et25 M5 hubs
19x10 et4 (current)
19x10 et1
et4
et1
02-15-2015, 09:56 AM
#5
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My Ride: E60
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Can you post some more front shots? Specifically one side angle with the wheel turned completely one way to see the tire width. Still wrapping my mind on how beautiful this wagon is. Nice AW with M5 mirrors and some crazy wheel offsets.
02-16-2015, 09:25 PM
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My Ride: Alpine E60, '09 535i-Premium, Sport and Comfort Access PackageMods: Lux H8 V3 Angel Eyes, Weisslicht LED license plate lights, Interior LED lights, RPI Scoop, Matte Black Grills, Smoked LED side markers & side reflectors, 35% tint all around, and a 3
Very nice. Yeah those roads out in Oakland are horrendous. I've been lucky that my F14's have been durable for the last 60k miles driving around the Bay Area. So far only a small bend on the passenger front and rear wheel which were fixed easily.
02-17-2015, 06:35 AM
#8
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It sounds like Forgestar's Flow-formed technology is more like cast wheel +10% than anything resembling a forged wheel in terms of strength. Though 60k on East Bay highways is holding-your-own I suppose.
Evan
