Need A Reliable MECHANICAL Speedomenter?

I recently motorized a mountain bike and it is great.  I bet I can top 40MPH!!  Only problem is, I have no way of knowing for sure how fast I'm actually going.  I could buy a digital speedo for like $10-20 but I want the look of having a speed gauge on my bike, plus it's a little harder to read a digital speedo at a quick glance when the screen is like 2 inches long and wide!  I saw this mechanical speedo on ebay for $10-20, but some reviews of it on other sites says it breaks really easily, or as soon as it hits 30 MPH it goes crazy.  Does anyone know where I can get a reliable mechanical (analog) speedometer?

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caarntedd5 years ago
Motorcycle scrap yard.
aeronut01 (author)  caarntedd5 years ago
I was thinking of this, but there are two problems with that. 1) I live in Cypress Texas, there isn't a scrapyard here for anything! That really sucks when you need parts for cheap. 2) A motorcycle or car speedometer's speed range is way too high. I doubt I will go faster than 40-ish mph, so a speedometer that reads 100+mph is a bit overkill.
Exercise bike?
aeronut01 (author)  caarntedd5 years ago
That might work. I know someone with one. I'll go check it out, thanks.
rickharris5 years ago
Car scrap yard. You will have to play around with gearing to get it to work from your bike - The cost should be minimal.