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which derailleur?

Old 08-14-21, 09:16 AM
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bishop130771
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which derailleur?

Hi All
I've got the largest hope freewheel 11 speed cassette (largest sprocket 48T) but am struggling to find a rear derailleur to suit. The box extra wide seems to suit up to 50T but not available any more??!!! Any suggestions/guidance would be much appreciated
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Old 08-14-21, 10:17 AM
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What is going on here? Tell us what bike you have and what shifters you have and that will help determine things.
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Old 08-14-21, 10:26 AM
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Sorry that would help!! Got XT M8000 shifters to match derailleur...I heard of people finding a way of making this derailleur work with 48T with a bit of patience with setting up, also heard people using wolf tooth hanger but I can't see how the mech is ever going to get to the huge 48t gear!
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Old 08-15-21, 07:27 AM
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any ideas anyone?
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Old 08-16-21, 06:17 AM
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When I've on my MTB I've only gone out to 42 teeth, but used long cage SLX with a RD dropper bracket, there are plenty of huge range cassettes out there now, I would go looking around the bike shops see what set ups they have on ones for sale with these dinner plate size cassettes on, done it a few times always good for inspiration.
Also check the web for these group-sets with these cassettes, & note the RD.
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Old 08-16-21, 07:11 AM
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RD-M8000 SGS & 11-50 cassette at 30 seconds into the video...

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Old 08-16-21, 08:40 AM
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Originally Posted by bishop130771 View Post
Sorry that would help!! Got XT M8000 shifters to match derailleur...I heard of people finding a way of making this derailleur work with 48T with a bit of patience with setting up, also heard people using wolf tooth hanger but I can't see how the mech is ever going to get to the huge 48t gear!
Which derailleur are you using? Your thread title seems to be asking which derailleur folks would suggest, then your post above suggests you have a derailleur. Are you saying you have an RD-M8000? If so, whether you have the GS (medium cage) or the SGS (long cage), the derailleur is not designed to work with a cassette larger than 46 teeth. Sometimes you can get it to support a larger sprocket ... sometimes by luck with just how the frame hanger positions the derailleur. For guaranteed compatibility, however, you'll need a derailleur designed to accommodate such a large sprocket.

The Shimano RD-M5100-SGS is designed to work with as large as a 51t sprocket. I assume your SL-M8000 shifters will work with it, but I don't know for sure.
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Old 08-16-21, 08:45 AM
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You might also try shortening your chain by a link or two, if you have some extra length to play with. Sometimes a slightly shorter chain will pull the cage just far enough forward so that the guide pulley rotates rearward and downward just far enough to clear a larger-than-designed sprocket.
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