help look vs nike?

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If someone can help me, i ll apreciate it, I just bought a new bike but want to leave the old one on my computrainer, i only have a set of look pedals and I really dont want to buy another set, so i want to ride on my old bike in my computrainer with tennis shoes on regular pedals and ride my sunday ride with my look pedals, how could this affect my pedaling? will it affect my power ouptut on my computrainer when doing 2 x 20 at l4? Should I drop my old bike and use the new one on my computrainer and on the road?

thanks in advance

To keep things the same, I would first try to buy some used Look pedals for the old bike off of Ebay or Craigslist.

Or just buy some cheap toe clips for the old bike. Not the same as your Look clipless, but still more beneficial than just a platform pedal. Nashbar has various models for $5 to $8. http://www.nashbar.com/results.cfm?category=6000108&subcategory=60001077&storetype=&estoreid=&init=y&pagename=Category%3A%20Pedals