![]() ![]() Material and production quality looks amazing, and both shifters weigh 530gr. It’s either 2 or 3 compatible for front, and 8s at back, same with Dura Ace! First STI shifter for 105 series I can found is Shimano ST-1055, which started production in 1992, 2 years after Dura Ace, which makes sense. That doesn’t make sense, as Shimano would probably save that for Dura Ace, their highest-end road groupset. But a photo from 1989 shows a STI shifter with down tube shifters in the same photo, released by Shimano. I know for sure that Dura-Ace 7400 has 8 speed STI shifters, in 1990. It’s not clear when 105 got indexed shifting, AKA STI shifters, AKA brifters. It’s considered as the entry-level racing-ready groupset, even today. It was below Dura Ace and 600 (later Ultegra) when released, for price-concious competitive riders. ![]() 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 came to life “105 Golden Arrow” in 1980, then renamed to 105. In MTB-line, it sits between Deore and SLX. Mechanical version sits between lower end Tiagra and higher end Ultegra. Also, Shimano 105 Di2 is the cheapest and most recent electronic groupset of the company. Shimano 105 is the upper-middle groupset for road bikes, released back in 1982.
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