Help, Speedo is failing

I've never had a lot of faith in those mechanical Speedo's. I got one from Spooky Tooth once and after I back calculated the rpm scale vs. the mph scale I figured it would be accurate on a something like a 32" diameter wheel. Most bike shops will carry a wired speedometer that senses a magnet attached to the spokes for $20 - $30. The wireless ones are a lot more expensive. I recommend that you stay away from Blackburn. It was difficult to program and always had problems. I've since switched to a Cateye Velo5 and it is much simpler and so far more reliable.

Or use a small GPS

The electronics are more accurate and have no moving parts but some have reported problems with erroneous readings from interference from the sparkplug.
I have a Stewart-Warner on mine. Rockin' it Old Skool...

don't give up on your old school speedometer. I have one from the 1972 made in france. and it still works fine. as far as accurate. how accurate do you need to be?

Pitchfork311 said:

Well, I re adjusted it and mounted the sprocket to the front wheel, when riding in today, it read better than it ever has. think I got it working again. Thanks for all the ideas guys

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A little Tri-Flo or moly lube down in the workin' bits on that speedo drive probably wouldn't hurt things, either.