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Heras’s climbing bike. Note the oversized 1-3/8′ lower headset bearing, with the 1-1/8′ upper head cup. The u …

Heras's climbing bike. Note the oversized 1-3/8' lower headset bearing, with the 1-1/8' upper head cup. The upper cup has wrench flats (Shimano doesn't make threadless headsets), but the threads have been bored out for the threadless steering tube.

Heras’s climbing bike. Note the oversized 1-3/8′ lower headset bearing, with the 1-1/8′ upper head cup. The upper cup has wrench flats (Shimano doesn’t make threadless headsets), but the threads have been bored out for the threadless steering tube.  |  Photo: L. Zinn
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Heras's climbing bike. Note the oversized 1-3/8' lower headset bearing,  with the 1-1/8' upper head cup. The u ...
Heras’s climbing bike. Note the oversized 1-3/8′ lower headset bearing, with the 1-1/8′ upper head cup. The upper cup has wrench flats (Shimano doesn’t make threadless headsets), but the threads have been bored out for the threadless steering tube.  |  Photo: L. Zinn
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Slideshow: Click photo to view next image