Using a bmw rear end on my 1200 sei - Steve Saunders Goldwing Forums

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post #1 of 11 (permalink) Old 08-26-2018, 10:19 AM Thread Starter
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Using a bmw rear end on my 1200 sei

Starting a new project and have the rear diff out of a bmw with a 2.54 ratio. Has anyone done one of these conversions as i cant decide wether to use the original frame it comes in or bin it and make my own.
Cheers Bash
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post #2 of 11 (permalink) Old 08-26-2018, 10:31 AM
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interesting. will be good to see end result.
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post #3 of 11 (permalink) Old 08-26-2018, 10:41 AM
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This will be an interesting thread to follow. A word of caution though. There is a quadrennial event in the States that bring together serious long distance riders for a 10 day, 10,000+ mile competition. In previous years, BMW differential failures have taken out its fair share of competitors.

Maybe its just the nature of extreme distance riding, but the differential appears to be the Achilles Heal of BMWs in this situation.

Bruce

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post #4 of 11 (permalink) Old 08-26-2018, 11:30 AM
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You might want to check the load carry limit on the BMW. I assume you will be using the BMW wheel. Check the tire load too. There is a big difference in loaded weight between a BMW and a GL1200.

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post #5 of 11 (permalink) Old 08-26-2018, 11:36 AM
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I could be wrong , but as this is a trike sub forum, I think he is planning a BMW automotive axle for a trike conversion.

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post #6 of 11 (permalink) Old 08-26-2018, 11:47 AM
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Quote:
Originally Posted by basher View Post
Starting a new project and have the rear diff out of a bmw with a 2.54 ratio. Has anyone done one of these conversions as i cant decide wether to use the original frame it comes in or bin it and make my own.
Cheers Bash

one of our forum members is/was a big time trike builder, and it seems like he mentioned using the diff out of a BMW car....


he has retired and is not active on here anymore much... wish I could rmember his name, he built his own fibreglass moulds.

~ John


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post #7 of 11 (permalink) Old 08-26-2018, 12:12 PM
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Quote:
Originally Posted by OldSchool_IsCool View Post
This will be an interesting thread to follow. A word of caution though. There is a quadrennial event in the States that bring together serious long distance riders for a 10 day, 10,000+ mile competition. In previous years, BMW differential failures have taken out its fair share of competitors.

Maybe its just the nature of extreme distance riding, but the differential appears to be the Achilles Heal of BMWs in this situation.
Pretty sure he is building a trike with a BMW car rear end. About as bullet proof as anything you would find. I worked on BMWs for 18 years and never saw a bad one.

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post #8 of 11 (permalink) Old 08-26-2018, 01:24 PM Thread Starter
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Yes sorry using the car back end for a trike conversion.
The bmw rear is quite wide and i would like to cut about 18" out of it and shorten the shafts 9" each side. Can't remember but there are 4 or 5 arms which hold the hubs in place which is why i was thinking it may be easier to just start with the diff,shafts and hubs and go from there.
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post #9 of 11 (permalink) Old 08-26-2018, 02:32 PM
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Found his thread, he used a Mustang, and a Jag rear diff


https://www.goldwingfacts.com/forums...rear-ends.html

~ John


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post #10 of 11 (permalink) Old 08-26-2018, 03:04 PM
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Yes sorry using the car back end for a trike conversion.
.
Ah! I missed that part. Carry on.

Bruce

Current Bikes:
---------------------
74 CB750 K4
77 CB550 K3
82 CM250C
82 GL1100 Interstate w/ Auburn Gemini (doublewide) Sidecar

Past Bikes:
------------------
What?? SELL a bike??

------------------
Can I have a motorcycle when I get old enough?
If you take care of it.
What do you have to do?
Lots of things. You've been watching me.
Will you show me all of them?
Sure.
Is it hard?
Not if you have the right attitudes. Its having the right attitudes that's hard.


PGR since 2011
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