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Forum: Classic & Vintage

09-19-21, 11:11 AM

Replies: 10

1985 Centurion Ironman Shifters

Views: 892

Posted By T-Mar

Shimano introduced SIS for the 1985 model year...

Shimano introduced SIS for the 1985 model year but only on New Dura-Ace. It was trickled down to New 600EX (6 speed) and Light Action for the 1986 model year. 105 level didn't recieve SIS until the...

Forum: Classic & Vintage

09-19-21, 11:07 AM

Replies: 10

1985 Centurion Ironman Shifters

Views: 892

Posted By T-Mar

Yes, the 1985 Centurion Ironman used friction...

Yes, the 1985 Centurion Ironman used friction shifting, while 1986 was indexed shifting. It was quite common to retro-fit SIS to older models to bring them up to date. Another possibility, if you...

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