Halfdoesyn Posted June 13, 2016 Posted June 13, 2016 I was pondering the idea converting a 3x9 MTB to a 1x9, with a nice wide range cassette. Of course, "wide range" is not exactly synonymous with 9-speed - talking about 11-40 or 42 here. Making up a cassette like that means you'll have to hack 'n' tack together cogs and add an expander and possibly a spacer, and, and, and... It has been done and it works well, so no arguments about that. My point is: why do the industry force us to upgrade to the expensive 11-speed parts when we just want a simple wide range cassette in 9-speed. You're only missing a couple of cogs, so I don't think the gaps will be that bad. Something like 11-13-16-19-21-24-32-36-42 would work? Maybe I've answered my own question. Maybe a gap for someone in the market. Maybe I'm the only one...
robsc Posted June 13, 2016 Posted June 13, 2016 Good idea . I just dont think any 9 speed rear derailleurs would handle that range though ? B-screw would need to be turned in quite far to get the top pulley wheel far enough from the 42t cog
Halfdoesyn Posted June 13, 2016 Author Posted June 13, 2016 This guy built one that worked and he used a short cage XTR derailleur. I'm sure there must be a way, even getting longer B-screw or fitting a larger hanger.
Hairy Posted June 13, 2016 Posted June 13, 2016 I like where this thread is going ... I have a nice good condition 9spd xo der and shifter looking for a new lease on life!
paarlmtb Posted June 13, 2016 Posted June 13, 2016 I tried based on the link provided with an X0 9speed and a 42 but cannot get it to work despite the longer b screw provided threaded in from the opposite side Maybe if there was a goatlink type hanger extender for sram it would work as suggested above. Will also be following with interest At the moment have 11 - 13 - 15 - 18 - 21 - 24 - 28 - 32 - 36
Halfdoesyn Posted June 13, 2016 Author Posted June 13, 2016 Ok, here's another question: Why does an 11-speed derailleur work with large sprockets, like 42T and a 9-speed supposedly not? I've never seen the 2 side by side, so I don't know. I was under the impression that it's mainly the shift ratio that's different. Comparing like for like, of course.
robsc Posted June 13, 2016 Posted June 13, 2016 Built completely different as well as the top pulley wheel is "off-centre" (on the newer 11 speed systems) to allow the wheel to move further "away" from the cassette as the chain gets "shorter" . Not quite sure how to explain this properly
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