The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: chewy4x4 on April 03, 2010, 01:29:45 AM

Title: Final drives
Post by: chewy4x4 on April 03, 2010, 01:29:45 AM

What year final drives will fit an 81 r65 and how do the gearings work?

Title: Re: Final drives
Post by: chewy4x4 on April 05, 2010, 10:25:27 PM

Any one?

Title: Re: Final drives
Post by: NC Steve on April 05, 2010, 10:33:17 PM

There are quite a few threads discussing this topic on the board.

You may want to do a search for final drives, final gearing, etc, you should find a bunch of info. Go back as far as possible in your search too.
Good luck.

Title: Re: Final drives
Post by: nhmaf on April 05, 2010, 10:39:48 PM

Any of the 81-84 final drives will fit.  Final drives from the 79-80 R65 bikes will probably also work, but may require different spacers and axle.  All the R65 bikes from 79-84 came with either 31/9 (3.44) or 32/9 (3.56) final drive ratios, which need to be used with either W1276 or W1318 (respectively) calibrated speedometers for the odometer & speedometer readings to match that of the final drive.

You could probably also put a similar year R80 final drive on (usually either 37/11 (3.36) or 32/10 (3.2) your R65 but your acceleration will suffer a bit (and you'll need a different calibrated speedometer, too).

Title: Re: Final drives
Post by: Rob Valdez 79 R65 on April 05, 2010, 10:49:08 PM

[size=14]And R65LS final drives are out of the question![/size]
They use a different-sized brake shoe diameter, and who knows what else?

Steve proved me wrong.

Title: Re: Final drives
Post by: chewy4x4 on April 05, 2010, 10:51:56 PM

Thanks yall

Title: Re: Final drives
Post by: NC Steve on April 05, 2010, 11:05:42 PM

Quote

[size=14]And R65LS final drives are out of the question![/size]
They use a different-sized brake shoe diameter, and who knows what else?

Britta's sported an LS drive for a good 10K or more, with no side effects so far.

I'm assuming (hoping? praying?) that, other than using LS-specific brake shoes when the time comes, we might just live happily ever after... :-?

Title: Re: Final drives
Post by: Rob Valdez 79 R65 on April 05, 2010, 11:33:40 PM

Quote

Quote

[size=14]And R65LS final drives are out of the question![/size]
They use a different-sized brake shoe diameter, and who knows what else?

Britta's sported an LS drive for a good 10K or more, with no side effects so far.

I'm assuming (hoping? praying?) that, other than using LS-specific brake shoes when the time comes, we might just live happily ever after... :-?

Does it also use a LS wheel?

Title: Re: Final drives
Post by: NC Steve on April 05, 2010, 11:37:00 PM

Quote

Quote

Quote

[size=14]And R65LS final drives are out of the question![/size]
They use a different-sized brake shoe diameter, and who knows what else?

Britta's sported an LS drive for a good 10K or more, with no side effects so far.

I'm assuming (hoping? praying?) that, other than using LS-specific brake shoes when the time comes, we might just live happily ever after... :-?

Does it also use a LS wheel?

Nope, just a plain old '84 snowflake.

it all works fine too...for now, anyway... :-/