Depends on what type of speedo you're after... If it's a simple digital speedo, you'll need a magnet on your disc and the pickup on the fork leg in line. If you want a cable driven speedo, good luck
Did you have a particular speedo in mind or have you bought one already? I'd recommend getting a bicycle speedo; this may sound silly/lame but a lot of them do >100kph (I know of a few that run to 300...) and will be cheap and easy to setup. Just make sure you get one you can set the tyre circumference in mm with
BNIB CATEYE CYCLING BIKE COMPUTER/SPEEDO VELO 8 - NEW - eBay Cycle Computers, Accessories, Cycling, Sport. (end time 18-Aug-10 20:42:19 AEST)
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