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8sp Alivio shifter and 8/9sp Tiagra rear derailleur?

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8sp Alivio shifter and 8/9sp Tiagra rear derailleur?

Old 05-16-19, 12:29 PM
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8sp Alivio shifter and 8/9sp Tiagra rear derailleur?

Can someone stop me before I do a dumb thing and waste a night getting these to play nicely together? or just tell me it's going to be OK?

I may be able to get pics and model numbers tonight, but I am away from the partially-assembled bike right now.
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Old 05-16-19, 12:34 PM
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they should work nicely together .
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Old 05-16-19, 12:45 PM
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I'm not so certain they will. I thought I remembered reading that Shimano's mtb line up doesn't use the same pull ratio on their shifters as they do road. May well be wrong, but if you have them and they aren't shifting correctly, then that's something to consider.
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Old 05-16-19, 12:59 PM
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Originally Posted by Iride01 View Post
I'm not so certain they will. I thought I remembered reading that Shimano's mtb line up doesn't use the same pull ratio on their shifters as they do road. May well be wrong, but if you have them and they aren't shifting correctly, then that's something to consider.
they are both road levels parts , so they should work together .
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Old 05-16-19, 01:06 PM
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Originally Posted by bikeman715 View Post
they are both road levels parts , so they should work together .
From what I've seen, Alivio has always been on mtn bikes, while Tiagra has always been on road bikes. I'm not confirming or denying anything here, just saying what I've seen/experienced.
BTW, if you go to Trek's website, and send them a message, they typically get back to you very quickly (if you do it today, you'll likely have an accurate response by the weekend.).
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Old 05-16-19, 01:31 PM
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Up to 9 speed Shimano had the same pull ratio (IIRC except for some old Dura-Ace) for all RDs. Your parts should work together.

Starting from 10s things change: old 10s Tiagra has the same pull ratio as the 7/8/9 speed ones. 10s MTB is different, new 10s Tiagra is different.

https://www.sheldonbrown.com/deraile...ment.html#rear - article regarding RD adjustment.
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Old 05-16-19, 01:35 PM
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I had a little trouble last week with it not reeling the cable back in on downshifts, but it occurred to me last last night that that might be a cable routing issue. I'll update after I get some tinkering time tonight.
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Old 05-17-19, 09:46 AM
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Yup - cable routing issue. Fixed it and they work like a champ. Oh-- and it was an Altus shifter, not Alivio as mentioned.
Thanks, Internet Bike Mechanics!
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Old 05-17-19, 10:51 AM
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A lot of Shimano's low end stuff is quite impressive these days. And some of their high end stuff can be quite underwhelming as well.
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Old 05-17-19, 11:51 AM
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Originally Posted by Lemond1985 View Post
A lot of Shimano's low end stuff is quite impressive these days. And some of their high end stuff can be quite underwhelming as well.
I agree I rode a BikesDirect Motobecane with 2x7 Tourney and was surprised at how well it shifted. I've also replaced a few gripshift setups with Shimano EF51 shifters and they shifted good.

I didn't end up weighing it but I bet that Tourney crankset weighed five pounds.
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