Reynolds is an English company and most of their tubesets were imperial, with metric sizes as a less common option. The earliest 753 tubesets were metric only.....
WHY?
Metric might make sense if some French bike company was the first to use 753, but the 753 tubes were first used by fellow TI company Raleigh, right? In fact, it is my understanding that Raleigh, and particularly Gerald O'Donnovan, were instrumental in the development of the 753 tubing. So what's with the metric specs?
Tom Dalton Bethlehem, PA, USA (where our official units of weights and measures is the SI.... really!)
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