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I am looking to fit an aftermarket mechanical speedo to my fightered Ace and I am not sure which ratio I need. There are several that are 1:1, 2:1 and some that say 60 mph:2240 RPM and 2:1:1.

After alot of unsuccessful dicking around with digital speedos i just want a simple analog speedo that will work with the existing speedo drive.

Any input would be appreciated.

PS this is the sort of thing I mean

http://www.ebay.co.uk/itm/MINI-SPEE...D-NEW-BOXED-/190640502789?hash=item2c630f3805
 

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The 2240rpm=100kph is fairly universal among Japanese bikes. However, the ratio of the drive unit on the axle varies bike to bike to maintain that calibration (to account for different tire sizes). If the bike has the original drive unit, the 2240/100k speedo should be accurate or at least close.


The 1:1 and 2:1 are generally used by Harleys that read speed off the transmission or rear wheel.
 
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