I ordered a TACX ball-bearing jockey wheel set last week for the Shimano 7 speed range, and I believe that both pulleys come with 11 teeth. I've just noticed that my current Megarange Derailleur has a larger bottom-wheel, which has 13 teeth.
Will the loss of two teeth cause any problems if I replace it with the TACX wheel?
Thanks in advance, any comments would be appreciated.