The current road lineup is Claris / Sora / Tiagra / 105 / Ultegra / Duraace
105 stands out as odd because its a number. Is there some special meaning ?
- 105 was released in 1983 as a 6 speed groupset under the name "A105 Golden Arrow"
- At the time Ultegra was known as "600" so some consistency in a 3 digit number. Dura Ace was always called Dura Ace, and Ultegra got its name in 1997
- MTB groupsets have always had a name. There are no numbers for the groupset as a whole, though each year's revision has a model number.
Conjecture from the web
- 105 is the reverse of 501, which came from Levi's Jeans, popular in the late 80s in Japan and matching the "workhorse reliable" nature of the 105.
- 105 reads as "SOI" or "501" when rotated 180 degrees. But SOI is not a Japanese nor English word, like Dura-Ace ( Duralumin alloy + Ace 'best') or Ultegra = ( ultimate" + Integrity)
- In the late 80s Shimano introduced SIS shifting and SLR braking. At this time many groupsets were stopped, like the 200GS, 300GS, 400GS, 500EX, and Exage. New groupsets with SIS/SLR replaced them over time.
So why has "105" persevered ?