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old reply: 200m, wouldn't go higher then 50x15 myself.
Just saw that reply. The chain won't be a serious issue still. If you can keep up, that's good. If you are up with those standards, it might be wise to just test what feels right. What is right for me isn't right for you. Different speciality's require different gearrings anyway.
1R8 is the Tester recommended racing chain, 1Z1 is for training (apparently).