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Shimano 105 STI Compatibilty

Old 04-14-10, 04:50 AM
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Shimano 105 STI Compatibilty

Would you expect new Shimano 105 STI shifters (e.g. ST-5600) to be compatible with a Shimano 105 rear derailleur that is about 20 years old?
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Old 04-14-10, 09:43 AM
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Yes.
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Old 04-14-10, 10:19 AM
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Thank you.
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Old 04-14-10, 11:15 AM
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Maybe.

The old derailleur was likely designed for 7-speed gear clusters, which were narrower than today's 8-9-10 drivetrains. It may not be able to travel far enough inboard to reach the low gear. Then again, maybe it will!
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Old 04-15-10, 04:16 AM
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It was indeed designed for 7-speed cassette but it does have enough travel for a 10-speed cassette.

Basically, I have started using my bike again after many years. I no longer have the original wheels but everything else is at least 20 years old. I was given a pair of wheels (with 10-speed Shimano cassette) and with my downtube shifter switched to friction mode it all works (almost). The only issue that I have is unintentional upshifting (https://www.sheldonbrown.com/autoshift.html). Replacing the gear cable and lubricating the cable guide under the bottom bracket improved the situation but didn't cure the problem entirely. I've also made sure that the downtube shifter is tight.

I see that you can buy 10 speed downtube shifters but these are Dura Ace 7900 which I believe is not compatible with the 105 derailleur so I believe my best option is to get the 105 STI shifters.

Any other suggestions gratefully received.
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Old 04-15-10, 04:28 AM
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Did you change to a 10s chain from your 7-8?
How's the derailleur hanger alignment?
Otherwise, The friction mode on your shifters may not be holding their position well.

7900 downtube shifters will work with 105.
It was only Dura-Ace 1984-96 that had different pull ratios.
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Old 04-15-10, 04:52 AM
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Originally Posted by Metzinger
Did you change to a 10s chain from your 7-8?
Yes, I forgot to mention that - it's a new 10s chain.
Originally Posted by Metzinger
How's the derailleur hanger alignment?
Although I did have a few crashes back in the day it looks pretty straight.

Originally Posted by Metzinger
7900 downtube shifters will work with 105.
It was only Dura-Ace 1984-96 that had different pull ratios.
That's very good to know - that would certainly be the cheapest solution for me.

Thanks for your help.
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Old 04-15-10, 11:54 AM
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Didn't levers and derailleurs change somewhere about the 9-sp or 10-sp era? I read that they changed the amount of cable travel for some reason, so new levers wouldn't be compatible with old derailleur and vice-versa.

Maybe what I'm thinking about is only a dura-ace thing:
https://sheldonbrown.com/dura-ace.html
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Old 04-15-10, 12:25 PM
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Originally Posted by bjtesch
Didn't levers and derailleurs change somewhere about the 9-sp or 10-sp era? I read that they changed the amount of cable travel for some reason, so new levers wouldn't be compatible with old derailleur and vice-versa.

Maybe what I'm thinking about is only a dura-ace thing:
https://sheldonbrown.com/dura-ace.html
AFAIK, only certain DA had different pull ratios than other Shimano lines.
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Old 04-15-10, 10:02 PM
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Originally Posted by montescalion
That's very good to know - that would certainly be the cheapest solution for me.
If you can afford the STIs, why not bite the bullet? Not having dual control is a handicap.
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