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tryout of a mashup drivetrain

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tryout of a mashup drivetrain

Old 09-06-20, 08:07 PM
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GTA
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tryout of a mashup drivetrain

I was planning a 11 spd drivetrain upgrade for my flat bar Dahon Helios.

I have tried the Shimano R8000 rear derailleur with Shimano RS700 shifter, l but I really don't like the RS700. You have to push the lever very hard to shift.

Then I start to think if I can make use of an old Sram XO 9spd rear derailleur.
Because its cable pull ratio is as same as Shimano 11spd mtb, so I came up with an idea: try it with Shimano M7000 shifter.

In the end, surprisingly, this mashup works well! The shifting is actually pretty accurate and fast. And you don't need to push hard.

I suppose all similar mashups should also work.
That means, a combination of any of Sram X4/X5/X7/X9/X0 (8 or 9 spd) and any of Shimano m5100/m6000/m7000/m8000/m9000 (11spd) will run as a 11 spd system.

Bingo!





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Old 09-06-20, 11:01 PM
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Congratulations on the finding! I reckon though that this cage is carbon. I would not dare to put it on a full size bike, not to say about a folder. I had a Shimano RD, with an alu cage, for a number of years on a full-size bike and replaced it with an Sram, also with an alu cage. The latter snapped within 3 weeks or so. Since then, my Sram RD principle is that it is not going on a bike unless the cage is steel, either because it is low level enough, or I retrofitted a cage from a lower level, or I cut out the cage myself out of steel.
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Old 09-09-20, 02:15 PM
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Me thinks you just want to show off your handsome bicycle. Very nice in-deed. Such attention to detail.
One question: Why the rear wheel quick release on the drive side? Is it just because it is one of the nicest looking QR levers and it compliments the derailleur?
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Old 09-09-20, 07:08 PM
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Originally Posted by 2_i View Post
Congratulations on the finding! I reckon though that this cage is carbon. I would not dare to put it on a full size bike, not to say about a folder. I had a Shimano RD, with an alu cage, for a number of years on a full-size bike and replaced it with an Sram, also with an alu cage. The latter snapped within 3 weeks or so. Since then, my Sram RD principle is that it is not going on a bike unless the cage is steel, either because it is low level enough, or I retrofitted a cage from a lower level, or I cut out the cage myself out of steel.
As long as it is properly installed, conmissioned and maintained, the RD and its cage will not be vulnerable, no matter it is carbon or metal.
Sorry for your bad experience, but I believe it was just by accident.
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Old 09-09-20, 07:09 PM
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Originally Posted by zebede View Post
Me thinks you just want to show off your handsome bicycle. Very nice in-deed. Such attention to detail.
One question: Why the rear wheel quick release on the drive side? Is it just because it is one of the nicest looking QR levers and it compliments the derailleur?
Thanks, Z,
It has nothing to do with the look. Just to minimize the width when folded.
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Old 09-09-20, 07:40 PM
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Originally Posted by GTA View Post
As long as it is properly installed, conmissioned and maintained, the RD and its cage will not be vulnerable, no matter it is carbon or metal.
Sorry for your bad experience, but I believe it was just by accident.
This was about what Sram was claiming. The cage snapped as I was starting from rest rather than riding, so they did not want to honor the warranty, I changed the wheel and the chain presumably was sitting on a cog inconsistent with the derailleur. Well, components are for normal people and normal situations and not some idealized impossible to maintain conditions. I was not isolated as there many people spitting online on that particular Sram RD and I believe there are some spitting on the one you have now. My immediate reaction was of no more Sram components on any bike in my care, but then I could not really afford that , so it is Sram only if there is no other comparable choice. In any case, good luck, if you can make it function there, it is just admiration from me. I go in fact to another limit that, after a handlebar roll, the bike needs to be fully rideable, including not having to check how the chain is seated.
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Old 09-10-20, 04:27 AM
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With folding, the derailleur can get damaged in transit as the derailleur is exposed and rest on... I am guilty of that but, in the case on the jetstream, I don't care and in the case of the helios, the sora derailleur is small so it's not to bad.

Having said that, it may be a good idea to fit a rear derailleur guard as there used to be in the 90's on MTB
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