The Sun XCD cranks have the old TA Pro 5 VIS attachment system with a 50.4 mm BCD for the outer or single chainring. Middle and inner rings (if fitted) are then bolted directly to the outer chainring. This makes it a great choice for a single chainring setup.
Cranks come with a set of 5 crank to chainring bolts, pedal washers, axle bolts and nicely engraved dust caps.
TA Cyclotouriste rings are still available but really you should track down a NOS TA single ring with no mounting holes for inner rings. I have a very small quantity of these in 1/8" in various sizes up to 59 tooth. Please ask for a price if you would like to buy one with SunXCD cranks.
Also available with a Adaptor for use with 110 mm Single Chainrings. Adaptor also suitable for use with double and triple chainrings (110 mm / 74 mm BCD).
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