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Old 05-18-2015, 09:15 AM   #1
JoeTalor OP
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R65 Subframe vrs R100 Subframe.

Hello,

i am building a R100 and want a shorter subframe. What is the difference in length of the R65 and R100 and can i use the R65 subframe on my R100?

Thanks!
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Old 05-18-2015, 10:16 AM   #2
Big Bamboo
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It will bolt right up, but the upper shock mounts will be a couple inches further forward. The difference is the same as the difference between long wheelbase and short wheelbase BMWs in the /5 era. Different systems for mounting the side covers too.
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Old 05-18-2015, 10:21 AM   #3
190e
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Quote:
Originally Posted by JoeTalor View Post
Hello,

i am building a R100 and want a shorter subframe. What is the difference in length of the R65 and R100 and can i use the R65 subframe on my R100?

Thanks!

Don't know the difference in dimensions between R65 and R100 subframes but I do know that even R65 subframes are not all the same. The early 78 - 80 R65 had a slightly shorter wheel base and therefore the subframe and swinging arm are different from the 81-84 R65's.

If there is something you need measuring on an early R65 subframe I can do that for you.
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Old 05-18-2015, 10:39 AM   #4
JoeTalor OP
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Quote:
Originally Posted by 190e View Post
Don't know the difference in dimensions between R65 and R100 subframes but I do know that even R65 subframes are not all the same. The early 78 - 80 R65 had a slightly shorter wheel base and therefore the subframe and swinging arm are different from the 81-84 R65's.

If there is something you need measuring on an early R65 subframe I can do that for you.
I would appreciate that! i want to avoid chopping up the current subframe but its too long for what i am building.
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Old 05-18-2015, 10:59 AM   #5
Big Bamboo
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What year R65? I have an '84 I can measure.
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Old 05-18-2015, 11:03 AM   #6
JoeTalor OP
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Quote:
Originally Posted by Big Bamboo View Post
What year R65? I have an '84 I can measure.
I have an 84 R100 but i want to use the shorter R65 subframe. If you can measure your 84 i would really appreciate that. Thanks
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Old 05-18-2015, 11:10 AM   #7
Steve in OC
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I have a R65 subframe and a R90 subframe. The R90 subframe is from a 1976 R90. I don't know the year of the R65 subframe. The R65 subframe is about 1 3/4" shorter than the R90 subframe. Likewise, the upper shock mounts are about 1 3/4" farther forward on the R65 subframe.
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Old 05-18-2015, 11:21 AM   #8
r60man
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My father worked in a BMW dealership. He always cautioned me about R65s saying "They are odd ducks" meaning that for most airheads part X is from 75-79 and they made a gazillion of them, so parts are available. Like subframes. But R65's are weird and so parts are harder to get.
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Old 05-18-2015, 11:52 AM   #9
190e
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I measured the triangle of mounting points for you centre to centre:

Horizontal measurement Top frame mount to shock 9.5"

Vertical measurement Top frame mount to bottom frame mount 11.25"

Diagonal measurement Bottom frame mount to shock 13.125"
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