Shimano 105 is the upper-middle groupset for road bikes, released back in 1982. Also, Shimano 105 Di2 is the cheapest and most recent electronic groupset of the company. Mechanical version sits between lower end Tiagra and higher end Ultegra. In MTB-line, it sits between Deore and SLX. It came to life “105 Golden Arrow” in 1980, then renamed to 105. There are various claims why it was called 105, most interesting one is its “501” in reverse, the most-loved and well regarded Levi’s jeans in Japan at the time. It was below Dura Ace and 600 (later Ultegra) when released, for price-concious competitive riders. It’s considered as the entry-level racing-ready groupset, even today. It’s not clear when 105 got indexed shifting, AKA STI shifters, AKA brifters. I know for sure that Dura-Ace 7400 has 8 speed STI shifters, in 1990.… Continue Reading Groupset of the month: Shimano 105 History (road)
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