Strain-gauge plug-and-play replacement for the quickshifter unit on the gear-change rod. It replaces the sometimes-troublesome OEM springs and microswitches. This was sold as fitting the V4 Panigale range of superbikes. I can see no reason why it wouldn’t also fit the V4 Streetfighter bikes. It may fit the V2 Streetfighter. It would be up to you to determine its suitability to bikes other than the V4 Panigale. These are circa £450 new. This one can be yours for £210 including delivery.