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Deciphering Speedometers
Deciphering Speedometers
Anyone have any information on this W number, or information on where to get parts to fix mine, or where to send mine for repair? Or maybe you have one lying around to send my way?
- schrader7032
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Re: Deciphering Speedometers
As for your W 1.138, I cannot find that number referenced on this page:
https://bmwmotorcycletech.info/ringgears.htm
Do you mean 1.318? If it is 1.318, then your final drive is likely 32/9 or 3.56.
I've seen some people mention Joe's Speedometer in Reseda, California as well as Overseas Speedometer in Austin, TX.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
- srankin
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Re: Deciphering Speedometers
Terryvira@hotmail.com
St.
Re: Deciphering Speedometers
I think it has a decimal, but I am not positive. It is old and I am olderschrader7032 wrote: ↑Sat Sep 16, 2023 6:30 amDo you mean 1.318? If it is 1.318, then your final drive is likely 32/9 or 3.56.
I only assumed a decimal since the aftermaket ones that are more clearly visible seem to have one, as do some of the old ones on eBay.
Thank you so much for this info! I was looking at a couple on eBay out of different model airheads. Mine only registers 80mph. I'm wondering if the others
(they have slightly larger W numbers) will still work because they register 120-140mph. I'd hate to throw away $300-$400 just to find out
- schrader7032
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Re: Deciphering Speedometers
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
Re: Deciphering Speedometers
I guess I'll contact these folks and price it out whether I take it on myself or put it in someone else's hands.
- Darryl.Richman
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Re: Deciphering Speedometers
Note also that W indicates turns for whatever the base unit of the speedometer is. A kmh speedometer is turns per km, an mph speedometer is turns per mile.
- srankin
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Re: Deciphering Speedometers
As for the speedometer part, I would caution taking the spring behind the needle apart or letting it get unwound. I had a speedometer issue years ago and had a log chat with Terry Vera as to how things work. That spring has to be wound just right to calibrate the speed as well as to prevent the needle bouncing. It is fussy to adjust.
I I had a 85mph unit I sacrificed to learn kind of how things work. it can be fussy to get things back together. Good luck. St.
- wa1nca
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Re: Deciphering Speedometers
Never understood what the W meant
Always best to use a GPS apt on your cell phone to get the correct speed
correct working speedometer with errors,mismatched speedometer,transmission,rear end,rear tire
will all effect a correct indicated speed
54 R51/3, 55 R50/Velorex 560 sidecar, 64 R27, 68 R69US, 75 R75/6
Ashfield, Ma
USA