All the chainrings we sell are to fit 5-Arm CD (Compact Drive) spiders, including the Middleburn Pro Trials and TNN Engineering RS7 Bashring. Unfortunately they are not compatible with Onza T-Bird cranksets or 4-Bolt spiders.
Technical InfoNew to trials? Then check out our product video guides for useful tips and technical advice
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Tarty Bikes, T/A Inspired Bicycles Ltd, Unit 2 The Gallows, Furnace Road, Ilkeston, DE7 5EP, UK
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