One-Up 50 Tooth Shark
mark~p
Posts: 55
I have upgraded an XT M8000 11 speed with one of the One-Up components 50 tooth dinner plates. The pack included the 50 tooth large cog, an 18 tooth middle and the deraileure cage. This changes the standard medium cage into the SGS sizing. My change was already SGS so I have not bothered to take this apart.
Fitting the parts was straight forward and there is plenty of thread left on the B screw ( no need to muck about replacing it)
My original setup was an XT 10 speed with an 11-40 Praxis Works cassette used with a 32 tooth front N/R ring. This proved reliable and was as good a compromise as was possible without spending silly money on SRAM plus new wheels. The 1- speed gave reliable shifting but in many way was still a compromise on the range of available rations, particularly compared to a triple or double. (The bike originally had a standard XT M780 triple that was then replaced with a 40/24 double)
42 32 24
11 3.82 2.91 2.18
13 3.23 2.46 1.85
15 2.80 2.13 1.60
17 2.47 1.88 1.41
19 2.21 1.68 1.26
21 2.00 1.52 1.14
23 1.83 1.39 1.04
26 1.62 1.23 0.92
30 1.40 1.07 0.80
34 1.24 0.94 0.71
The Praxis gave me the following with a 32.
32
11 2.91
13 2.46
15 2.13
17 1.88
19 1.68
21 1.52
24 1.33
28 1.14
34 0.94
40 0.80
The top end is still a major compromise and that bit extra at the bottom had a greater impact than expected on the long climbs at places like Coed-y-Brenin. Both the front and rear needed changing so I though I would try the M8000 with the One-Up expander. The result has been spectacular. Shifting is an absolute dream with crisp change up and down the range, actually slicker than the Praxis. As an aside it is also far better than my son's bike that used one of the e-thirteen extenders with the replacement 16 tooth. Yes is has cost a bit to replace the shifter & mech as well but overall I think it has been worth every penny. The new setup is an 11 to 50 cassette with a 36 front. I believe this finally is offering a single ring setup that is not a compromise or needs the front ring switching endlessly to suit different trails.
36
11 3.27
13 2.77
15 2.40
18 2.00
21 1.71
24 1.50
28 1.29
32 1.13
36 1.00
42 0.86
50 0.72
The bike is an older Cube Stereo 2012 running 26" wheels with a few tweaks to the specification here and there.
Overall I really recommend the One-Up expander.
Fitting the parts was straight forward and there is plenty of thread left on the B screw ( no need to muck about replacing it)
My original setup was an XT 10 speed with an 11-40 Praxis Works cassette used with a 32 tooth front N/R ring. This proved reliable and was as good a compromise as was possible without spending silly money on SRAM plus new wheels. The 1- speed gave reliable shifting but in many way was still a compromise on the range of available rations, particularly compared to a triple or double. (The bike originally had a standard XT M780 triple that was then replaced with a 40/24 double)
42 32 24
11 3.82 2.91 2.18
13 3.23 2.46 1.85
15 2.80 2.13 1.60
17 2.47 1.88 1.41
19 2.21 1.68 1.26
21 2.00 1.52 1.14
23 1.83 1.39 1.04
26 1.62 1.23 0.92
30 1.40 1.07 0.80
34 1.24 0.94 0.71
The Praxis gave me the following with a 32.
32
11 2.91
13 2.46
15 2.13
17 1.88
19 1.68
21 1.52
24 1.33
28 1.14
34 0.94
40 0.80
The top end is still a major compromise and that bit extra at the bottom had a greater impact than expected on the long climbs at places like Coed-y-Brenin. Both the front and rear needed changing so I though I would try the M8000 with the One-Up expander. The result has been spectacular. Shifting is an absolute dream with crisp change up and down the range, actually slicker than the Praxis. As an aside it is also far better than my son's bike that used one of the e-thirteen extenders with the replacement 16 tooth. Yes is has cost a bit to replace the shifter & mech as well but overall I think it has been worth every penny. The new setup is an 11 to 50 cassette with a 36 front. I believe this finally is offering a single ring setup that is not a compromise or needs the front ring switching endlessly to suit different trails.
36
11 3.27
13 2.77
15 2.40
18 2.00
21 1.71
24 1.50
28 1.29
32 1.13
36 1.00
42 0.86
50 0.72
The bike is an older Cube Stereo 2012 running 26" wheels with a few tweaks to the specification here and there.
Overall I really recommend the One-Up expander.
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Comments
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mark~p wrote:[the one-up derailleur cage] changes the standard medium cage into the SGS sizing. My change was already SGS so I have not bothered to take this apart.
The main reason for the one-up cage (as opposed to the stock SGS cage) is that it offsets the upper jockey wheel relative to the pivot point, so that as you shift towards the larger sprockets, and the cage swings forward, the jockey wheel itself swings further out, giving more clearance.0 -
Thanks for that tip, when I lined then up the hole spacing looked the same. I will look at swapping it out tonight.0
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Finally fitted the One-Up cage today, it was a right fiddle. I had to spend some time trying to get the cage off the mech it is was not clear what needed to be done. Also, once I had it access to the bolt, it was very still with threadlock.
To summarize, this is what I did
Remove the 2 jockey wheels and fit them to the new cage
Push the cage so that the stop bolt can be unscrewed. This is not strictly necessary as a new bold it provided but it makes working on everything much easier.
Remove the 3 small screws on the clutch cover
Use a 4mm allen key down the centre of the clutch assembly to unscrew the bolt holding the cage on. Make sure that the clutch mech does not lift.
Carefully remove the cage from the mech, the spring will be hooked onto the cage.
Remove the spring
Remove the large thick washer and put over the new bolt on the One-Up cage
Refit the spring to the One-Up cage
Refit the cage and tighten the bolt
Rotate the cage so that it is under tension and fit the stop. This is a real pain and you need many hands to get everything in place. Bluetack to hold the bold onto the end of a screwdriver helps.
Refit the cover
Align everything and test!
I used some blue middle strength threadlock on the various bolts I took out.0 -
There's a video on the One Up website which gives step by step, clear instructions. It's a simple ten minute job when following the instructions.Transition Patrol - viewtopic.php?f=10017&t=130702350
