http://www.ebay.de/itm/SRM-Dura-Ace-Leistungsmesser-/271004973922?pt=Sport_Radsport_Fahrradteile&hash=item3f1927bb62
101 Euro right now.
Cons- it's wired.
Pros- I reckon it'll go for less than £500, and you'll be able to sell it for that when you are done experimenting.
@Dammit started
London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
This site is supported almost exclusively by donations. Please consider donating a small amount regularly.
http://www.ebay.de/itm/SRM-Dura-Ace-Leistungsmesser-/271004973922?pt=Sport_Radsport_Fahrradteile&hash=item3f1927bb62
101 Euro right now.
Cons- it's wired.
Pros- I reckon it'll go for less than £500, and you'll be able to sell it for that when you are done experimenting.