Select the size you need from the drop down menu. Stock Tomos is 26T. This front sprocket will work on A3, A35, and A55. Some modifications may be needed for the larger sprockets. Depending on what sprocket you go with, you may need to add or remove links from your chain.
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Reviews
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Sprocket for A3 Tomos
This is the largest (27) front sprocket that fits the case without cutting and grinding. It works well.
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Front Sprocket for Tomos A3
FYI. The stock A3 is 26T. The biggest you can fit there without cutting into the case is 27T. The 28T will not fit without modifying the case. Nik N.