2018 Alpina B7 spare wheel options - Bimmerfest - BMW Forums



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Old 06-22-2019, 11:20 AM
paul.j.ghosh paul.j.ghosh is offline
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2018 Alpina B7 spare wheel options

The Alpina B7 has larger brakes from what I understand and the 18" space saver spare will not fit. BMW does not appear to provide an option for a spare wheel. So, I started researching wheels for specifications such as ET, width, center bore size, bolt pattern and diameter. I discovered that some Mercedes models have similar ET and identical bolt pattern and hub size. I think the following should work if the calipers can clear a 19" wheel. The numbers match up better than with the 18" space saver spare. What are your thoughts?


OEM tire: 245 45 19" wheel: 8.5" ET 25 bore 66.6 bolt 5x112
spare tire: 155 70 19" wheel: 5.5" ET 13 bore 66.6 bolt 5x112

OEM spare
Diameter 703.1mm 699.6mm
Circumference 2208.9mm 2197.9mm
Poke 83mm 56.9mm
Inset 133mm 82.9mm
Speedo error 0% 0.5%
Reading at 30mph 30mph 30.15mph
Reading at 60mph 60mph 60.3mph
Ride height gain 0mm -1.75mm
Arch gap loss 0mm -1.75mm


calculations from: https://www.willtheyfit.com/index.ph...5-5&offset2=13

Last edited by paul.j.ghosh; 06-22-2019 at 11:33 AM.
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  #2  
Old 06-22-2019, 11:26 AM
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AlteBMW AlteBMW is offline
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Quote:
Originally Posted by paul.j.ghosh View Post
The Alpina B7 has larger brakes from what I understand and the 18" space saver spare will not fit. BMW does not appear to provide an option for a spare wheel. So, I started researching wheels for specifications such as ET, width, hub size, bold pattern and diameter. I discovered that some Mercedes models have similar ET and identical bolt pattern and hub size. I think the following should work if the calipers can clear a 19" wheel. The numbers match up better than with the 18" space saver spare. What are your thoughts?


OEM tire: 245 45 19" wheel: 8.5" ET 25 hub 66.6 bolt 5x112
spare tire: 155 70 19" wheel: 5.5" ET 13 hub 66.6 bolt 5x112

OEM spare
Diameter 703.1mm 699.6mm
Circumference 2208.9mm 2197.9mm
Poke 83mm 56.9mm
Inset 133mm 82.9mm
Speedo error 0% 0.5%
Reading at 30mph 30mph 30.15mph
Reading at 60mph 60mph 60.3mph
Ride height gain 0mm -1.75mm
Arch gap loss 0mm -1.75mm


calculations from: https://www.willtheyfit.com/index.ph...5-5&offset2=13
I think it is worth a call to Tire Rack, who are very knowledgeable about what fits what. I can't comment further and I would not rely on anyone's answer here.
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Old 07-02-2019, 03:28 PM
jettie1767 jettie1767 is offline
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How are you going to fit that in the trunk? There's no space for it.
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Old 07-12-2019, 09:25 AM
Falcon900Easy Falcon900Easy is offline
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Our B7 has runflats now but when I replace them I will buy the mobility kit.
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Old 07-14-2019, 06:43 PM
jettie1767 jettie1767 is offline
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Originally Posted by Falcon900Easy View Post
Our B7 has runflats now but when I replace them I will buy the mobility kit.
Is your B7 on 20s? Thought those weren't runflats. My car is on 21s and they are not runflats.
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Old 07-15-2019, 04:42 AM
Falcon900Easy Falcon900Easy is offline
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Quote:
Originally Posted by jettie1767 View Post
Is your B7 on 20s? Thought those weren't runflats. My car is on 21s and they are not runflats.
21's, I think they are runflats because the car did not come with a spare or mobility kit. I will have to check again.
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