Speedometer Ratios and Final Drives
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Autor Thema: Speedometer Ratios and Final Drives  (Gelesen 1286 mal)

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Kurt in S.A.

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Speedometer Ratios and Final Drives
« am: 12 Januar 2019, 01:10:23 »

A question regarding the proper matching of the little "W" number on the speedometer face to a final drive ratio.  Not just for singles but is there a list somewhere on the forum that provides the suitable pairings that left the factory?

Thanks...Kurt
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Speedometer Ratios and Final Drives
« am: 12 Januar 2019, 01:10:23 »

Taz

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Re: Speedometer Ratios and Final Drives
« Antwort #1 am: 12 Januar 2019, 07:48:24 »

Hello Kurt.

You may want to have a look at http://monos.r25-bike.de/#tacho_EN ,resp. http://monos.r25-bike.de/#hagetriebe_EN ..and please keep in mind that the values for W are valid for km/h speedos, mph would need to be calculated from there....

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Re: Speedometer Ratios and Final Drives
« Antwort #2 am: 12 Januar 2019, 11:25:08 »

Hi Kurt

I found additional information for MPH speedometers for my R26 here.

http://bmwvmca.org/joomla/index.php?option=com_content&task=view&id=118&Itemid=37

Brian
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Re: Speedometer Ratios and Final Drives
« Antwort #3 am: 12 Januar 2019, 12:38:03 »

I have the BMW VMCA article but was looking for something more from BMW.  Someone has mentioned using a speedometer with 0.715 but I haven't seen that listed on any publications.

Kurt
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Re: Speedometer Ratios and Final Drives
« Antwort #4 am: 12 Januar 2019, 13:20:30 »

Once you know the ratio then get Guenter to make one up for you. ulrikewiha@web.de

That's what I did for mine as the mph speedo for my R26 is unobtainable.

https://photos.app.goo.gl/w84WZw3kWZoUNYVq1

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Re: Speedometer Ratios and Final Drives
« Antwort #5 am: 12 Januar 2019, 14:30:55 »

I was hoping to find a relatively correct listing of speedometer and final drive ratios listed for future reference.

Kurt
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Re: Speedometer Ratios and Final Drives
« Antwort #6 am: 12 Januar 2019, 15:20:34 »

There is only one W ratio that will match the final drive and MPH spectrometers are rare for the singles and it was far more cost effective to get a spare KPH speedo altered.

I hope this helps
Brian

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Re: Speedometer Ratios and Final Drives
« Antwort #7 am: 12 Januar 2019, 16:17:35 »

Thanks, Brian.  In full disclosure, someone said they had a 0.715 KPH speedo and he wants to use it for an R69S.  I have yet to find this ratio listed.  That was why I was looking for more official documentation.  I'm not sure if this person wants to or needs to send the speedo off for overhaul.

Kurt
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