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Mixing road shifters and derailleurs with MTB crankset

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Mixing road shifters and derailleurs with MTB crankset

Old 01-08-18, 09:43 AM
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perezjimenez
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Mixing road shifters and derailleurs with MTB crankset

Hello everyone. I have heard that mix MTB crankset with road brifter and derailleur is not possible (different cable pulls, chain line, etc.). But look at Ridgeback Panorama. A touring bike with 2018 shifters (Shimano Sora ST-R3030 3x9 speed), front derailleur (Shimano Sora FD-R3030) and a Shimano Alivio crankset (Shimano FC-T4060 / 48-36-26T). Assuming that works, then this beauty is ready to dress a whopping 44 -32 -22 Alivio Crankset and road brifters!

I'm missing something?

look at ridgeback.co.uk/bikes/touring/world/panorama
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Old 01-08-18, 09:48 AM
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Old 01-08-18, 10:02 AM
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Note the Search box above so as to make use of all the times this has been answered repeatedly.. FAQ.

this has had so many previous Questioners and lengthy reply threads ..

I cannot regurgitate all those past discussions as well as a search can recall ...







....

Last edited by fietsbob; 01-09-18 at 10:55 AM.
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Old 01-08-18, 10:05 AM
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It is using an XT rear derailleur with 9 speed road shifting.

I get an invalid certificate warning with your URL, but this one seems to work:
https://www.ridgeback.co.uk/bikes/to...world/panorama

I think it coincidently works in this case, but in general it can be problematic.
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Old 01-08-18, 10:06 AM
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Originally Posted by fietsbob View Post
Note the Search box above so as to make use of all the times this has been answered repeatedly.. FAQ.
You are up to 29,776 truly helpful and insightful posts.
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Old 01-08-18, 10:41 AM
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Originally Posted by perezjimenez View Post
I'm missing something?
You are missing the point that there are exceptions to virtually everything. Most of the things that get floated around here and elsewhere as LAW never to be broken, are just guidelines to help for quick evaluation and let you know when more investigation is needed.

Since they are selling it, they likely did the investigation to see if it works reasonably well.

As well, it's usually the STI's for drop bars that get you into compatibility issues with equipment that is marketed as "mountain bike". The bike I see has a flat bar.
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Old 01-08-18, 10:44 AM
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Anecdote; Over many decades , my friction shifters on my bar ends, keep working.. , others feel a Need for Brifters ..

Gevenalle offers friction shifters located on the front of drop bar brake levers --2 reliable simple mechs combined..


Lots of yadda yadda about pull ratio mis match has already been offered...


Bear in mind when you ask the things to shift matters , that involves thinking more than shopping.

Watch the terrain ahead anticipate the gear you need and get in it before you hit the hard climb..






....

Last edited by fietsbob; 01-09-18 at 10:59 AM.
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Old 01-08-18, 10:50 AM
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You may run into issues with the curve of the front derailleur arc and the 44 tooth big chainring.
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Old 01-08-18, 10:54 AM
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Originally Posted by wgscott View Post
You are up to 29,776 truly helpful and insightful posts.
I know. But the consensus is that it is not possible and as I have seen a possible solution that works, I thought it deserves a new thread. Maybe someone solves it. For example, the Triban 520 equipped with 3x9 Sora 3000 (sold in Decathlon) is only worth 500 euros. It is prepared to carry front and rear carriers and fenders. I have put a 11-36 cassette that works perfectly without replacing the sora rear derailleur sora ( 20). For only 60 more (Alivio crankset) is possible to build a very capable bike for light touring for only 600 euros.
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Old 01-08-18, 10:59 AM
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As well, it's usually the STI's for drop bars that get you into compatibility issues with equipment that is marketed as "mountain bike". The bike I see has a flat bar.[/QUOTE]

I mean this bike. Maybe I did not express myself clearly.
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Old 01-08-18, 10:59 AM
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Consensus means every one mutually compromises to reach an agreement, for those new here, that just does not happen..

there is just the agree to disagree , choose your faction..


Seems back at 9 speeds there was more crossover , it has diverged more, since..






..

Last edited by fietsbob; 01-08-18 at 11:05 AM.
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Old 01-08-18, 11:03 AM
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Originally Posted by perezjimenez View Post
I know.
I forgot the sarcasm tags.

It is kind of funny to see someone with 30,000 (mostly information-devoid) posts chastising someone for their one whole (knowledgeable) post.

Anyway, welcome to the forum.
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Old 01-08-18, 11:05 AM
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Originally Posted by wgscott View Post
You are up to 29,776 truly helpful and insightful posts.
Apparently you aren't aware that the post count used to roll over after 9,999?
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Old 01-08-18, 11:08 AM
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I am sorry. My native language is not English and maybe I look rude. It is not my intention. My apologies if I have bothered someone.
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Old 01-08-18, 11:16 AM
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Originally Posted by perezjimenez View Post
I am sorry. My native language is not English and maybe I look rude. It is not my intention. My apologies if I have bothered someone.

Your question is perfectly reasonable, and not rude at all.

The lack of cross-compatibility between mountain and road drive trains is a major, on-going problem.
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Old 01-08-18, 04:54 PM
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Originally Posted by perezjimenez View Post
I am sorry. My native language is not English and maybe I look rude. It is not my intention. My apologies if I have bothered someone.
You have to realize that most of the "responses" to your thread are not directed to answering your question. So no need to apologize. This is a high volume forum and a lot of us like to throw friendly and sometimes not-so-friendly punches at the other members here just for kicks to our boring lives. I'm guilty quite often too.

I see that the bike you intended to reference does indeed have drops. But I still go back to my earlier post. The so called "rules" about compatibility are not set in stone. There are many exceptions.


I also have seen manufacturer websites that have the wrong specifications listed for their own bikes. So if you think they are trying to sell something that doesn't work, you might first check with them and be sure the spec's posted are correct and what they have to say about it.
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Old 01-08-18, 05:14 PM
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What makes it work is that Sora is a road group and the Sora front derailleur works with the Sora brifters. The fact that the Alivio crank is nominally an MTB crank doesn't matter that much since the curvature of the 44T largest chainring will work with the Sora road front derailleur.

What doesn't work well is an MTB front derailleur with a road shifter as the cable pull requirements are different.
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Old 01-09-18, 01:40 AM
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Originally Posted by Retro Grouch View Post
You may run into issues with the curve of the front derailleur arc and the 44 tooth big chainring.
This would also be my concern. Plus chainline. The Sora FD on the Ridgeback is the native match for the STI's, so that will work.

But the problem with a road FD and MTB crankset can be:
  1. Ring size: the Sora FD is match for a 50t big ring and a difference between biggest and smallest of 20t. The Alivio crankset i very close to this with 48t and 22t. A 44t big chainring could be another matter.
  2. Chainline: On MTB's the ring on the crankset are further out from the middle of the bike. This can be a problem for Road FD's. The Sora FD is made for a chainline om 45mm, the Alivio crankset 50mm. If you have a crankset with a square taper BB, you can adjust the chainline (if the rings clear the frame). Maybe Ridgeback have done this, because the listed BB for the bike (BB-ES300 68-126mm) is an octalink (which also come i different lengths). But the listed crankset (Shimano FC-T4060) is for external bearings. So one of these parts is incorrect. You have to get in touch with Ridgeback to ask the what they have done on the bike.
Edit: it's a very nice bike, that Ridgeback!
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Old 01-09-18, 06:30 AM
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perezjimenez, As long as the pull ratio of the FD matches the indexed shifter, it works. (Chain ring size difference can be a minor problem.)
Touring riders have long mixed mountain and road derailleur transmissions.

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Old 01-09-18, 11:01 AM
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Originally Posted by perezjimenez View Post
As well, it's usually the STI's for drop bars that get you into compatibility issues with equipment that is marketed as "mountain bike". The bike I see has a flat bar.
I mean this bike. Maybe I did not express myself clearly.

if just buying a bike already built, like that, [#10] the OEM product manager should have sorted that out.. just buy it.





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Old 01-09-18, 11:08 AM
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Friction shifters will solve your problem(s).
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Old 01-09-18, 09:07 PM
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I wanted to do this but was unlucky to have sram 1:1 rear derailleur that's not compatible with anything road. Here's a sweet website with a good crossover chart.

Art's Cyclery Blog Science Behind the Magic | Drivetrain Compatibility

There's three important things for indexed shifting, rear cogs spacing, cable pull from the shifter, and the actuation ratio on the rear derailleur.
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