Speedometer Ratio??

[Moto_Goosie]

I have an 89 Kat 600 that I have modified and can no longer use the original manual speedometer. I can find a whole bunch of neat aftermarket speedometers but what I can't find is the ratio needed in order to pick which one...HELP!

[cintidude04]

What ratio would you need? What kind've aftermarket speedo you looking at?

[Moto_Goosie]

I need the cable ratio. Cable driven (mechanical, first post I mistakenly put manual -_- *smacks self* sorry for the typo) speedometers are 2.1 or 1.1. I was wondering what it was as it does not say on the original speedometer. I was looking at getting a Drag mini and would hate to spend 50+ on the wrong one.

[MrBrant]

Well, I have yet to verify this, but according to my research (read: Googling) a while ago, most of the big-4 tried to use the same speedo cable speed.

Not exactly a straight x : x ratio but apparently the common figure is 2240rpm (cable speed) at 60mph.

[cintidude04]

Never heard of those ratios honestly. But Brant is correct, check out www.gearingcommander.com for all kinds of info on gearing ratios, speed vs rpm etc.

[Moto_Goosie]

Awesome, thanks! 2240:60 = 2:1 I believe. Just read it somewhere last night, I'll have to re-look. Great link but right now it's over my head.

[Moto_Goosie]

Well checks out you can buy speedometers in that ratio. Ordered one and hopefully it works, should find our Friday.

[bagndrag]

bringing back an old thread but did anyone ever fund out if the ratio ended up being 2:1? need to order a new one for mine and dont wanna get the wrong one