^^ Cateye? ... You can get a spare mount kit which makes switching from bike to bike dead easy. 26 quid so a bit more than a rubber band admittedly.
http://www.google.co.uk/products/catalog?hl=en&sugexp=kjrmc&cp=5&gs_id=4d&xhr=t&q=spare+wireless+bike&gs_upl=&bav=on.2,or.r_gc.r_pw.,cf.osb&biw=1117&bih=668&bs=1&um=1&ie=UTF-8&tbm=shop&cid=5757434020249586529&sa=X&ei=l3WhTpLyGIm_8gOQ7tnFBQ&sqi=2&ved=0CFoQ8gIwAw
@Wrongcog started
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^^ Cateye? ... You can get a spare mount kit which makes switching from bike to bike dead easy. 26 quid so a bit more than a rubber band admittedly.
http://www.google.co.uk/products/catalog?hl=en&sugexp=kjrmc&cp=5&gs_id=4d&xhr=t&q=spare+wireless+bike&gs_upl=&bav=on.2,or.r_gc.r_pw.,cf.osb&biw=1117&bih=668&bs=1&um=1&ie=UTF-8&tbm=shop&cid=5757434020249586529&sa=X&ei=l3WhTpLyGIm_8gOQ7tnFBQ&sqi=2&ved=0CFoQ8gIwAw